DOCSLIB.ORG

Get to Know the Elements Use the Periodic Table in Pictures at to Answer the Following Questions!

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Get to Know the Elements Use the Periodic Table in Pictures at to Answer the Following Questions! Name ___________________________________________________________ Period __________ Get to Know the Elements Use the periodic table in pictures at http://elements.wlonk.com to answer the following questions! Which elements Which elements How many elements are magnetic? are liquid at room temperature? are gaseous at room 1. temperature? 2. 3. Where do the gaseous elements tend to be What radioactive located on the table? element has the What are the top ten most lowest atomic abundant elements in the number? human body? 1. 2. How many of the What are the top 3. elements are eight elements found 4. radioactive? in the Earth’s crust? 5. 6. Where do the radioactive 1. 7. elements tend to be located 2. 8. on the table? 3. 9. 4. 10. 5. 6. Where do the elements in the human 7. body tend to be located on the table? 8. What element is used What element is used Which elements are in batteries? in bicycles? considered “Noble Metals”? 1. 2. 3. What is a major 4. What element is used element found in eggs? 5. in making paint? 6. 7. 8. 9. What is a major What is a Where do the Noble Metals element found in major element tend to be located on the our bones? found in table? chlorophyll? Element Atomic Symbol Number Use this key to fill in the missing Picture of Element Use Name information in the element squares Use below. Period: 1 Group: 18 Family: Noble Gases Ne 38 Cu Mercury Period: Period: Period: Period: Group: Group: Group: Group: Family: Family: Family: Family: 82 Sb Tantalum Arsenic Period: Period: Period: Period: Group: Group: Group: Group: Family: Family: Family: Family: 63 Os 55 Uranium Period: Period: Period: Period: Group: Group: Group: Group: Family: Family: Family: Family: Name _______________KEY_________________________________________ Period __________ Get to Know the Elements Use the periodic table in pictures at http://elements.wlonk.com to answer the following questions! Which elements Which elements How many elements are magnetic? are liquid at room temperature? are gaseous at room 1. iron mercury & bromine temperature? 11 2. nickel 3. cobalt Where do the gaseous elements tend to be What radioactive located on the table? element has the What are the top ten most Toward the right side lowest atomic abundant elements in the number? human body? Technetium (#43) 1. hydrogen 2. carbon How many of the What are the top 3. nitrogen elements are eight elements found 4. oxygen radioactive? in the Earth’s crust? 5. sodium 37 (including 6. phosphorus superheavies) 1. oxygen 7. sulfur Where do the radioactive 2. sodium 8. chlorine elements tend to be located on 3. magnesium 9. potassium the table ? 4. aluminum 10. calcium Toward the bottom/actinides 5. silicon 6. potassium Where do the elements in the human 7. calcium body tend to be located on the table? 8. iron Toward the top What element is used What element is used Which elements are in batteries? in bicycles? considered “Noble Metals”? lithium scandium 1. ruthenium 2. rhodium 3. palldium What is a major 4. silver What element is used element found in eggs? 5. rhenium in making paint? sulfur 6. osmium cadmium 7. palladium 8. platinum 9. gold What is a major What is a Where do the Noble Metals element found in major element tend to be located on the our bones? found in table? chlorophyll? phosphorus In the center magnesium Element Atomic Symbol Number Use this key to fill in the missing Picture of Element Use Name information in the element squares Use below. Period: 1 Group: 18 Family: Noble Gases Ne 10 Sr 38 Hg 80 Cu 29 Neon Strontium Mercury Copper Advertising Signs Fireworks Thermometers Electric Wires Period: 2 Period: 5 Period: 6 Period: 4 Group: 18 Group: 2 Group: 12 Group: 11 Family: Noble Gases Family: Alkaline Earth Metals Family: Transition Metals Family: Transition Metals Ta 73 Pb 82 Sb 51 As 33 Tantalum Lead Antimony Arsenic Car Batteries Mobile Phones Weights Poison Period: 6 Period: 6 Period: 5 Period: 4 Group: 5 Group: 14 Group: 15 Group: 15 Family: Transition Metals Family: Poor Metals Family: Metalloid Family: Metalloid (Carbon Group) (Nitrogen Group) (Nitrogen Group) U 92 Eu 63 Os 76 Cs 55 Europium Uranium Osmium Cesium Color Televisions Nuclear Power Pen Points Atomic Clocks Period: 6 Period: 7 Period: 6 Period: 6 Group: 3 Group: 3 Group: 8 Group: 1 Family: Rare Earth Metals Family: Actinide Metals Family: Transition Metals Family: Alkali Metals Terms of Use © Sunrise Science Thank you for your purchase! The original purchaser of this document/product is granted permission to reproduce the pages in needed quantities for the purchaser’s classroom/home use only. By purchasing this resource, you are agreeing that the contents are the property of Sunrise Science and licensed to you only for classroom/personal use as a single user. I retain the copyright, and reserve all rights to this product. YOU MAY: o Use items (free and purchased) for your own classroom students, or your own personal use. o Reference this product in blog posts, at seminars, professional development workshops, or other such venues PROVIDED there is both credit given to myself as the author and a link back to my TPT store is included in your post/presentation. o Distribute and make copies of free items only to other teachers PROVIDED there is credit given to Sunrise Science and a link back to my TPT store. YOU MAY NOT: o Claim this work as your own, alter the files in any way (unless this has been advertised as an editable resource), or remove/attempt to remove the copyright/watermarks. o Sell the files or combine them into another unit for sale/free. o Post this document for sale/free elsewhere on the internet (this includes public classroom websites and Google Doc links on blogs). o Make copies of purchased items to share with others is strictly forbidden and is a violation of the Terms of Use, along with copyright law. o Obtain this product through any of the channels listed above. Thank you for abiding by universally accepted codes of professional ethics while using this product. If you encounter an issue with your file, notice an error, or are in any way experiencing a problem, please contact me at [email protected] and I will be more than happy to help sort it out! Thank you Karla @ Sunrise Science ☺ /SunriseSciences @SunriseScience @SunriseScienceClassroom I use Fonts and Graphics from these amazing artists:.
Load more

Recommended publications
  • Unit 3 Notes: Periodic Table Notes  John Newlands Proposed an Organization System Based on Increasing Atomic Mass in 1864
    Unit 3 Notes: Periodic Table Notes John Newlands proposed an organization system based on increasing atomic mass in 1864. He noticed that both the chemical and physical properties repeated every 8 elements and called this the ____Law of Octaves ___________. In 1869 both Lothar Meyer and Dmitri Mendeleev showed a connection between atomic mass and an element’s properties. Mendeleev published first, and is given credit for this. He also noticed a periodic pattern when elements were ordered by increasing ___Atomic Mass _______________________________. By arranging elements in order of increasing atomic mass into columns, Mendeleev created the first Periodic Table. This table also predicted the existence and properties of undiscovered elements. After many new elements were discovered, it appeared that a number of elements were out of order based on their _____Properties_________. In 1913 Henry Mosley discovered that each element contains a unique number of ___Protons________________. By rearranging the elements based on _________Atomic Number___, the problems with the Periodic Table were corrected. This new arrangement creates a periodic repetition of both physical and chemical properties known as the ____Periodic Law___. Periods are the ____Rows_____ Groups/Families are the Columns Valence electrons across a period are There are equal numbers of valence in the same energy level electrons in a group. 1 When elements are arranged in order of increasing _Atomic Number_, there is a periodic repetition of their physical and chemical
    [Show full text]
  • The Periodic Table of Elements
    The Periodic Table of Elements 1 2 6 Atomic Number = Number of Protons = Number of Electrons HYDROGENH HELIUMHe 1 Chemical Symbol NON-METALS 4 3 4 C 5 6 7 8 9 10 Li Be CARBON Chemical Name B C N O F Ne LITHIUM BERYLLIUM = Number of Protons + Number of Neutrons* BORON CARBON NITROGEN OXYGEN FLUORINE NEON 7 9 12 Atomic Weight 11 12 14 16 19 20 11 12 13 14 15 16 17 18 SODIUMNa MAGNESIUMMg ALUMINUMAl SILICONSi PHOSPHORUSP SULFURS CHLORINECl ARGONAr 23 24 METALS 27 28 31 32 35 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 POTASSIUMK CALCIUMCa SCANDIUMSc TITANIUMTi VANADIUMV CHROMIUMCr MANGANESEMn FeIRON COBALTCo NICKELNi CuCOPPER ZnZINC GALLIUMGa GERMANIUMGe ARSENICAs SELENIUMSe BROMINEBr KRYPTONKr 39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 RUBIDIUMRb STRONTIUMSr YTTRIUMY ZIRCONIUMZr NIOBIUMNb MOLYBDENUMMo TECHNETIUMTc RUTHENIUMRu RHODIUMRh PALLADIUMPd AgSILVER CADMIUMCd INDIUMIn SnTIN ANTIMONYSb TELLURIUMTe IODINEI XeXENON 85 88 89 91 93 96 98 101 103 106 108 112 115 119 122 128 127 131 55 56 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 CESIUMCs BARIUMBa HAFNIUMHf TANTALUMTa TUNGSTENW RHENIUMRe OSMIUMOs IRIDIUMIr PLATINUMPt AuGOLD MERCURYHg THALLIUMTl PbLEAD BISMUTHBi POLONIUMPo ASTATINEAt RnRADON 133 137 178 181 184 186 190 192 195 197 201 204 207 209 209 210 222 87 88 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 FRANCIUMFr RADIUMRa RUTHERFORDIUMRf DUBNIUMDb SEABORGIUMSg BOHRIUMBh HASSIUMHs MEITNERIUMMt DARMSTADTIUMDs ROENTGENIUMRg COPERNICIUMCn NIHONIUMNh
    [Show full text]
  • Adsorption Capacity and Removal Efficiency of Heavy Metal Ions By
    chemical engineering research and design 9 0 ( 2 0 1 2 ) 1397–1406 Contents lists available at SciVerse ScienceDirect Chemical Engineering Research and Design j ournal homepage: www.elsevier.com/locate/cherd Adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons a b b,∗ c,d,∗ Sheng-Fong Lo , Song-Yung Wang , Ming-Jer Tsai , Lang-Dong Lin a Department of Forestry and Natural Resources, National Ilan University, I-Lan, Taiwan, ROC b School of Forestry and Resource Conservation, College of Bio-Resource and Agriculture, National Taiwan University, No.1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, ROC c Department of Cultural Heritage Conservation, National Yunlin University of Science and Technology, Yunlin, Taiwan, ROC d Department of Forest Products Science, National Chiayi University, Chiayi, Taiwan, ROC a b s t r a c t In order to understand the adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons, the carbon yield, specific surface area, micropore area, zeta potential, and the effects of pH value, soaking time and dosage of bamboo activated carbon were investigated in this study. In comparison with once- activated bamboo carbons, lower carbon yields, larger specific surface area and micropore volume were found for the twice-activated bamboo carbons. The optimum pH values for adsorption capacity and removal efficiency of heavy metal ions were 5.81–7.86 and 7.10–9.82 by Moso and Ma bamboo activated carbons, respectively. The optimum 2+ 2+ 2+ 3+ soaking time was 2–4 h for Pb , 4–8 h for Cu and Cd , and 4 h for Cr by Moso bamboo activated carbons, and 1 h for the tested heavy metal ions by Ma bamboo activated carbons.
    [Show full text]
  • Aluminum Electrolytic Vs. Polymer – Two Technologies – Various Opportunities
    Aluminum Electrolytic vs. Polymer – Two Technologies – Various Opportunities By Pierre Lohrber BU Manager Capacitors Wurth Electronics @APEC 2017 2017 WE eiCap @ APEC PSMA 1 Agenda Electrical Parameter Technology Comparison Application 2017 WE eiCap @ APEC PSMA 2 ESR – How to Calculate? ESR – Equivalent Series Resistance ESR causes heat generation within the capacitor when AC ripple is applied to the capacitor Maximum ESR is normally specified @ 120Hz or 100kHz, @20°C ESR can be calculated like below: ͕ͨ͢ 1 1 ͍̿͌ Ɣ Ɣ ͕ͨ͢ ∗ ͒ ͒ Ɣ Ɣ 2 ∗ ∗ ͚ ∗ ̽ 2 ∗ ∗ ͚ ∗ ̽ ! ∗ ̽ 2017 WE eiCap @ APEC PSMA 3 ESR – Temperature Characteristics Electrolytic Polymer Ta Polymer Al Ceramics 2017 WE eiCap @ APEC PSMA 4 Electrolytic Conductivity Aluminum Electrolytic – Caused by the liquid electrolyte the conductance response is deeply affected – Rated up to 0.04 S/cm Aluminum Polymer – Solid Polymer pushes the conductance response to much higher limits – Rated up to 4 S/cm 2017 WE eiCap @ APEC PSMA 5 Electrical Values – Who’s Best in Class? Aluminum Electrolytic ESR approx. 85m Ω Tantalum Polymer Ripple Current rating approx. ESR approx. 200m Ω 630mA Ripple Current rating approx. 1,900mA Aluminum Polymer ESR approx. 11m Ω Ripple Current rating approx. 5,500mA 2017 WE eiCap @ APEC PSMA 6 Ripple Current >> Temperature Rise Ripple current is the AC component of an applied source (SMPS) Ripple current causes heat inside the capacitor due to the dielectric losses Caused by the changing field strength and the current flow through the capacitor 2017 WE eiCap @ APEC PSMA 7 Impedance Z ͦ 1 ͔ Ɣ ͍̿͌ ͦ + (͒ −͒ )ͦ Ɣ ͍̿͌ ͦ + 2 ∗ ∗ ͚ ∗ ͍̿͆ − 2 ∗ ∗ ͚ ∗ ̽ 2017 WE eiCap @ APEC PSMA 8 Impedance Z Impedance over frequency added with ESR ratio 2017 WE eiCap @ APEC PSMA 9 Impedance @ High Frequencies Aluminum Polymer Capacitors have excellent high frequency characteristics ESR value is ultra low compared to Electrolytic’s and Tantalum’s within 100KHz~1MHz E.g.
    [Show full text]
  • Of the Periodic Table
    of the Periodic Table teacher notes Give your students a visual introduction to the families of the periodic table! This product includes eight mini- posters, one for each of the element families on the main group of the periodic table: Alkali Metals, Alkaline Earth Metals, Boron/Aluminum Group (Icosagens), Carbon Group (Crystallogens), Nitrogen Group (Pnictogens), Oxygen Group (Chalcogens), Halogens, and Noble Gases. The mini-posters give overview information about the family as well as a visual of where on the periodic table the family is located and a diagram of an atom of that family highlighting the number of valence electrons. Also included is the student packet, which is broken into the eight families and asks for specific information that students will find on the mini-posters. The students are also directed to color each family with a specific color on the blank graphic organizer at the end of their packet and they go to the fantastic interactive table at www.periodictable.com to learn even more about the elements in each family. Furthermore, there is a section for students to conduct their own research on the element of hydrogen, which does not belong to a family. When I use this activity, I print two of each mini-poster in color (pages 8 through 15 of this file), laminate them, and lay them on a big table. I have students work in partners to read about each family, one at a time, and complete that section of the student packet (pages 16 through 21 of this file). When they finish, they bring the mini-poster back to the table for another group to use.
    [Show full text]
  • January 2019 PRODUCT REGULATORY STATUS Chemical
    January 2019 PRODUCT REGULATORY STATUS Chemical name: carbon black CAS №: 1333-86-4 Product trade name: Carbon black grades: N115, N120, N121, N134, N220, N220FA, N234, N299, N326, N330, N339, N347, N375, N539, N550, N650, N660, N762, N772, N774. Carbon black grades of OMCARB® series: S500, S500A, S500FA, S600FA, S700, S700FA, S800, S810, S820, H80, H100, C40, С50, С60, С70, С80, C140, CH85, СН200, СН210, CH600, P72, P80, P108, P110, P140. Carbon black grades of FairBlack series: R012, R013, R021, R022, R023, R027, R035, R056, R067 HAZARD CLASSIFICATION International Agency for Research on Cancer (IARC) has classified carbon black in Group 2B (may cause cancer in humans). The IARC classification is based on sufficient evidence in animals and inadequate evidence based on human health studies. However, it has been demonstrated with reasonable scientific certainty, that specific mechanism of tumor induction by carbon black in animals (specifically, rats) is not relevant to humans. We continue to believe that carbon black does not present a health hazard when handled in accordance with good housekeeping and safe workplace. See Section 11 of the Safety Data Sheet for additional information. European Union Carbon black is not a hazardous substance under classification criteria of Regulation (EC) 1272/2008 on classification, labelling and packaging of hazardous substances, as well as according to different amendments to this document. Turkey According to the criteria and requirements set forth in the Regulation on classification, labelling and packaging of hazardous substances and mixtures published in the Turkey Official Gazette under No. 28848 on December 11, 2013 (otherwise referred to as SEA Regulation), carbon black is not classified as hazardous substance.
    [Show full text]
  • Separation of Niobium and Tantalum - a Literature Survey Ernest L
    Ames Laboratory ISC Technical Reports Ames Laboratory 8-15-1956 Separation of niobium and tantalum - a literature survey Ernest L. Koerner Iowa State College Morton Smutz Iowa State College Follow this and additional works at: http://lib.dr.iastate.edu/ameslab_iscreports Part of the Chemistry Commons Recommended Citation Koerner, Ernest L. and Smutz, Morton, "Separation of niobium and tantalum - a literature survey" (1956). Ames Laboratory ISC Technical Reports. 145. http://lib.dr.iastate.edu/ameslab_iscreports/145 This Report is brought to you for free and open access by the Ames Laboratory at Iowa State University Digital Repository. It has been accepted for inclusion in Ames Laboratory ISC Technical Reports by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Separation of niobium and tantalum - a literature survey Abstract During recent years increased interest has been shown in the metal niobium. Because niobium has a high melting point (4376° F) and a low neutron cross-section, the Atomic Energy Commission has encouraged research on new methods of winning the metal from its ores with the ultimate hope of finding a process which would yield niobium metal at a reasonable price. The two areas of endeavor in which·the principal difficulties in finding such an economic process occur are the separation of tantalum from the niobium and the conversion of purified niobium salts to the metal. This report, then, was written to consolidate the more important information available in the literature on one of these troublesome areas, that of the separation of niobium and tantalum.
    [Show full text]
  • Periodic Table of the Elements Notes
    Periodic Table of the Elements Notes Arrangement of the known elements based on atomic number and chemical and physical properties. Divided into three basic categories: Metals (left side of the table) Nonmetals (right side of the table) Metalloids (touching the zig zag line) Basic Organization by: Atomic structure Atomic number Chemical and Physical Properties Uses of the Periodic Table Useful in predicting: chemical behavior of the elements trends properties of the elements Atomic Structure Review: Atoms are made of protons, electrons, and neutrons. Elements are atoms of only one type. Elements are identified by the atomic number (# of protons in nucleus). Energy Levels Review: Electrons are arranged in a region around the nucleus called an electron cloud. Energy levels are located within the cloud. At least 1 energy level and as many as 7 energy levels exist in atoms Energy Levels & Valence Electrons Energy levels hold a specific amount of electrons: 1st level = up to 2 2nd level = up to 8 3rd level = up to 8 (first 18 elements only) The electrons in the outermost level are called valence electrons. Determine reactivity - how elements will react with others to form compounds Outermost level does not usually fill completely with electrons Using the Table to Identify Valence Electrons Elements are grouped into vertical columns because they have similar properties. These are called groups or families. Groups are numbered 1-18. Group numbers can help you determine the number of valence electrons: Group 1 has 1 valence electron. Group 2 has 2 valence electrons. Groups 3–12 are transition metals and have 1 or 2 valence electrons.
    [Show full text]
  • Effect of Oxygen on the Corrosion of Niobium and Tantalum by Liquid Lithium
    ORNL-TM-4069 DECEIVED BY TIC MAR 2 01973 THE EFFECT OF OXYGEN ON THE CORROSION OF NIOBIUM AND TANTALUM BY LIQUID LITHIUM R. L. Klueh MASTER SiSTiHBUTWfl c-f THIS &3CmMT 13 U&UMITED r. I . • -I ' / •''Hi'; 1 . V/', •• I • • H I •-' , C •!", >i ; ' o ': 'J -1 ; .•..'.' •-•'I' < . • . .J ,• ! OAK RIDGE NATIONAL LABORATORY '-I. ' ' t- /operated'by "unjon 'carbide, coloration • forjhe'u.s. atowic1 ENERGY'CQMMISSION 1 • - " <•:-.*- '' .1 iS> '•'• . ' , 1 <• \ .1 I . 'v: • = 1 r i. H. ORNL-TM-4069 Contract No. W-7405-eng-26 METALS AND CERAMICS DIVISION THE EFFECT OF OXYGEN ON THE CORROSION OF NIOBIUM AND TANTALUM BY LIQUID LITHIUM R. L. Klueh NOTICE This report was prepared as an account of work sponsored by the United States Government. Neither the United States noi' the United States Atomic Energy Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility fir the accuracy, com- pleteness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. MARCH 1973 OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee 37830 operated by • i UNION CARBIDE CORPORATION for the U.S. ATOMIC ENERGY COMMISSION MASTER • • • 11X CONTENTS Page Abstract 1 Introduction 1 Experimental 5 Results ...... 7 The Effect of Oxygen in Lithium 7 The Effect of Oxygen in the Refractory Metal 9 Discussion ........ 16 Acknowledgments 21 THE EFFECT OF OXYGEN ON THE CORROSION OF NIOBIUM AND TANTALUM BY LIQUID LITHIUM R. L.
    [Show full text]
  • The Carbon Group Oxidation States Carbon Allotropes of Carbon
    Oxidation States • Properties vary dramatically through this group. Main Group Elements: Group 14 (4A, IV, IVA • Carbon is a nonmetal . The Carbon Group • Carbon is commonly found predominantly in covalent bonds (except carbides). • Silicon, though a semiconductor is mainly nonmetallic. • Germanium is a metalloid or a semi-metal . • At the bottom of the group, tin and lead can be commonly C, Si, Ge, Sn, Pb found in +2 and +4 oxidation states, and commonly found in ionic compounds ( metallic ) 2 2 • Valence electron configuration: ns np +2 ion is stable (seen in lead halides, PbX 2) Lone pair is stereochemically active (participates in determining the molecular geometry) inert pair effect Carbon Allotropes of Carbon - Diamond • Carbon appears in a wide variety of compounds in nature (see: “organic chemistry”), as well as in a large number of • Diamond is one of the hardest known inorganic complexes. substances. It is often used as a • The element is quite abundant in its standard state coating on blades to provide a (graphite ) and exists in a number of other forms ( allotropes harder/sharper surface of diamond and fullerenes are also well known). • It is produced from graphite at very allotropes: different structural forms of the same element high pressures, and is now commonly made synthetically • There are three important isotopes ( 12 C, 13 C, and 14 C). 12 C • 13 Bonding is covalent throughout, with is about 98.9% abundant, while C is about 1.1% 3 abundant. each atom being sp -hybridized. Diamond is thus chemically • 13 C is an important nucleus for NMR (nuclear magnetic unreactive resonance) studies, while 14 C is used for carbon-dating objects ( 14 C has a half-life of about 5730 years) 1 Allotropes of Carbon - Graphite Allotropes of Carbon - Fullerenes • Fullerenes: soccer ball-shaped arrangements of carbon atoms.
    [Show full text]
  • Thermal Analysis of Tantalum Carbide-Hafnium Carbide Solid Solutions from Room Temperature to 1400 ◦C
    coatings Article Thermal Analysis of Tantalum Carbide-Hafnium Carbide Solid Solutions from Room Temperature to 1400 ◦C Cheng Zhang, Archana Loganathan, Benjamin Boesl and Arvind Agarwal * Plasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, 33139 FL, USA; czhan009@fiu.edu (C.Z.); aloga006@fiu.edu (A.L.); bboesl@fiu.edu (B.B.) * Correspondence: agarwala@fiu.edu; Tel.: +1-305-348-1701 Received: 5 June 2017; Accepted: 25 July 2017; Published: 28 July 2017 Abstract: The thermogravimetric analysis on TaC, HfC, and their solid solutions has been carried out in air up to 1400 ◦C. Three solid solution compositions have been chosen: 80TaC-20 vol % HfC (T80H20), 50TaC-50 vol % HfC (T50H50), and 20TaC-80 vol % HfC (T20H80), in addition to pure TaC and HfC. Solid solutions exhibit better oxidation resistance than the pure carbides. The onset of oxidation is delayed in solid solutions from 750 ◦C for pure TaC, to 940 ◦C for the T50H50 sample. Moreover, T50H50 samples display the highest resistance to oxidation with the retention of the initial carbides. The oxide scale formed on the T50H50 sample displays mechanical integrity to prevent the oxidation of the underlying carbide solid solution. The improved oxidation resistance of the solid solution is attributed to the reaction between Ta2O5 and HfC, which stabilizes the volume changes induced by the formation of Ta2O5 and diminishes the generation of gaseous products. Also, the formation of solid solutions disturbs the atomic arrangement inside the lattice, which delays the reaction between Ta and O. Both of these mechanisms lead to the improved oxidation resistances of TaC-HfC solid solutions.
    [Show full text]
  • Ceramic Capacitors Replace Tantalum Capacitors in Ldos Jeff Falin
    Application Report SLVA214A–August 2005–Revised October 2006 Ceramic Capacitors Replace Tantalum Capacitors in LDOs Jeff Falin............................................................................................................. PMP Portable Power ABSTRACT With the proper considerations, ceramic output capacitors can be used with low dropout linear regulators (LDO) and DC/DC switching converters that require tantalum output capacitors. Many internally compensated linear regulators and switching converters require some equivalent series resistance (ESR) in the output capacitor, COUT. The control loop for these tantalum COUT-only converters relies on the zero that is created by the product of the output capacitance, COUT, and the ESR for stability. Converter data sheets typically provide a minimum (and possibly maximum ESR) value for a given output capacitance or the required frequency of the zero. For example, the data sheet for the TPS769xx family of linear regulators provides a curve of ESR versus output current for different output voltages(Figure 1). 10 W RegionofInstability 1 VO=3.3V CO=4.7 F VI =4.3V RegionofStability TA =25 C 0.1 ESR − EquivalentSeriesResistance − RegionofInstability 0.01 0 100 200 300 400 500 IO − OutputCurrent −m A Figure 1. Typical Region of Stability ESR Versus Output Current For various reasons including lower cost, smaller size, and/or reliability, some system engineers prefer to use ceramic capacitors instead of tantalum capacitors in their applications. A low-ESR ceramic output capacitor with a discrete series resistor can be used to replace a tantalum output capacitor. The schematic in Figure 2 shows such an implementation, using a 0.060-Ω series resistor and 4.7-µF ceramic output capacitor. This series combination of parts meets the TPS76933 ESR requirements shown in Figure 1; therefore, the linear regulator will be stable over the load range.
    [Show full text]