The Titanium Industry: a Case Study in Oligopoly and Public Policy
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2 Literature Review
2 Literature review 2.1 Thin film solid state reactions A solid state chemical reaction in the classical sense occurs when local transport of matter is observed in crystalline phases and new phases are formed.1 This definition does not mean that gaseous or liquid phases may not take part in the solid state reactions. However, it does mean that the reaction product occurs as a solid phase. Thus, the tarnishing of metals during dry or wet oxidation is also considered to be a solid state reaction. Commonly, the solid state reac- tions are heterogeneous reactions. If after reaction of two substances one or more solid product phases are formed, then a heterogeneous solid state reaction is said to have occurred. Spinel- and pyrochlore-forming reactions are well-known examples of solid-state reactions where a ternary oxide forms.5–11 In this Ph.D. thesis, heterogeneous solid state reactions are considered. Extended crystal defects as high mobility paths for atoms are essential in the reactivity of solids. Furthermore, interfaces play an important role in the solid state reactions because during hetero- geneous reactions interfaces move and mass transport occurs across them. The interfaces can be coherent, semicoherent or incoherent.28 At the interface, chemical reactions take place between species and defects; they are often associated with structural transformations and volume changes. The characteristics of thin film solid state reactions running on the nanometer scale are con- siderably different from solid state reactions proceeding in the bulk. During bulk reactions, the diffusion process is rate limiting and controls the growth. -
UNITE-D STATESJPATBNT Omen .V
.' Patented Sept. 11,1934 1,973,428 UNITE-D STATESJPATBNT omen .v ’ 1,973,428 ; CEMEN'I'ED man ommn'm'raamn Gregory J. Comstock, Edgcwoorl, Pa. assignor'to ~: ' ' ' , Firth-Sterling Steel CompanmMcKeeeport, 2a., , a corporation of Pennsylvania Y . ‘ ' ' No Drawing. Application November 8,‘ 1932, Serial No. 641,762 r .' 3 Claims. (ems-1‘) cold-press, method or the hot-ypress' method. In , . This invention relates generally to hard- ce-f the cold-press method thefmixtureis compacted " mented carbide materials made by a cementing into 'a billet under relatively ‘high'pressure, for -' ‘ or sintering process, and more ‘particularly to example 10,000#/sq.~ in.v and is then preferably such materials containing tungsten carbide, tan:- ,. given'a ‘preliminary sinter at about _1600°‘>-F. ‘of 5 talum carbide, titanium carbide and an auxiliary , It is cooled and :reshaped'and then given a ?nal, I , ‘ I metal, or alloy- such as cobalt, iron or nickel. sinter at a temperature of between ‘2600 and‘ Hard cemented carbide materials containing 32009.- E, . 7' . ~ - _ tungsten carbide and iron, cobalt. or nickel are The material may be made according to the ’ now known and have been described in hot-press method in which the heat ‘and pressure 65 10 Schroeter Patent No. 1,549,615. ‘ ' ‘ ' ' - ‘I ' are applied simultaneously. We’ preter in the ' In my application, Serial No. ‘512,917, filed hot-press, method to use. ‘a temperature‘ of about . November 4, 1931, there isdescribed a hard. 3200° F. and a pressure of about 140o#/sq. in'. cemented carbidematerial containing tungsten and.‘ to carry out the sintering‘for, about ?ve _ carbide, tantalum carbide and cobalt, nickel or minutes‘ at thisftemperature. -
Perovskites: Crystal Structure, Important Compounds and Properties
Perovskites: crystal structure, important compounds and properties Peng Gao GMF Group Meeting 12,04,2016 Solar energy resource PV instillations Global Power Demand Terrestrial sun light To start • We have to solve the energy problem. • Any technology that has good potential to cut carbon emissions by > 10 % needs to be explored aggressively. • Researchers should not be deterred by the struggles some companies are having. • Someone needs to invest in scaling up promising solar cell technologies. Origin And History of Perovskite compounds Perovskite is calcium titanium oxide or calcium titanate, with the chemical formula CaTiO3. The mineral was discovered by Gustav Rose in 1839 and is named after Russian mineralogist Count Lev Alekseevich Perovski (1792–1856).” All materials with the same crystal structure as CaTiO3, namely ABX3, are termed perovskites: Origin And History of Perovskite compounds Very stable structure, large number of compounds, variety of properties, many practical applications. Key role of the BO6 octahedra in ferromagnetism and ferroelectricity. Extensive formation of solid solutions material optimization by composition control and phase transition engineering. A2+ B4+ O2- Ideal cubic perovskite structure (ABO3) Classification of Perovskite System Perovskite Systems Inorganic Halide Oxide Perovskites Perovskites Alkali-halide Organo-Metal Intrinsic Doped Perovskites Halide Perovskites Perovskites A2Cl(LaNb2)O7 Perovskites 1892: 1st paper on lead halide perovskites Structure deduced 1959: Kongelige Danske Videnskabernes -
Method for Producing Thick Ceramic Films by a Sol Gel
Europäisches Patentamt *EP000815285B1* (19) European Patent Office Office européen des brevets (11) EP 0 815 285 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.7: C23C 18/12 of the grant of the patent: // C04B41/87, C04B41/50 22.08.2001 Bulletin 2001/34 (86) International application number: (21) Application number: 96901675.7 PCT/CA96/00088 (22) Date of filing: 13.02.1996 (87) International publication number: WO 96/29447 (26.09.1996 Gazette 1996/43) (54) METHOD FOR PRODUCING THICK CERAMIC FILMS BY A SOL GEL COATING PROCESS VERFAHREN ZUR HERSTELLUNG DICKER KERAMIKFILMS DURCH SOL-GEL-BESCHICHTUNGSPROZESS PROCEDE DE FABRICATION DE FILMS DE CERAMIQUE EPAIS METTANT EN UVRE UN PROCESSUS DE REVETEMENT SOL-GEL (84) Designated Contracting States: (74) Representative: AT BE CH DE DK ES FR GB GR IE LI NL PT SE Simpson, Alison Elizabeth Fraser et al Urquhart-Dykes & Lord, (30) Priority: 22.03.1995 US 409127 30 Welbeck Street London W1G 8ER (GB) (43) Date of publication of application: 07.01.1998 Bulletin 1998/02 (56) References cited: EP-A- 0 433 915 EP-A- 0 482 659 (73) Proprietor: QUEEN’S UNIVERSITY AT KINGSTON EP-A- 0 564 866 WO-A-96/00198 Kingston Ontario K7L 3N6 (CA) US-A- 4 921 731 (72) Inventors: • TECHNICAL DISCLOSURE BULLETIN, vol. 37, • BARROW, David No 09, September 1994, "Low Leakage, Ajax, Ontario L1S 6Z4 (CA) Temperature Invariant, High Dielectric Constant • PETROFF, Edward, T. Films, using Multilayered Sol-Gel Fabrication", Scarborough, Ontario M1T 1V8 (CA) page 27 - page 28 • SAYER, Michael • PATENT ABSTRACTS OF JAPAN, vol. -
Structure Refinement of Polycrystalline Orthorhombic Yttrium Substituted Calcium Titanate: Ca1−Xyxtio3+Δ (X = 0·1–0·3)
Bull. Mater. Sci., Vol. 34, No. 1, February 2011, pp. 89–95. c Indian Academy of Sciences. Structure refinement of polycrystalline orthorhombic yttrium substituted calcium titanate: Ca1−xYxTiO3+δ (x = 0·1–0·3) RASHMI CHOURASIA and O P SHRIVASTAVA∗ Department of Chemistry, Dr H.S. Gour University, Sagar 470 003, India MS received 23 May 2007; revised 7 September 2010 Abstract. The perovskite ceramic phases with composition Ca1−xYxTiO3+δ (where x = 0·1, 0·2and0·3; hereafter CYT-10, CYT-20 and CYT-30) have been synthesized by solid state reaction at 1050◦C. The structure refinement using general structure analysis system (GSAS) software converges to satisfactory profile indicators such as Rietveld 2 parameters: Rp, Rwp,RF and goodness of fit. The title phases crystallize at room temperature in the space group Pbnm (#62) with a = 5·3741(4) Å, b = 5·4300(4) Å, c = 7·6229(5) Å and Z = 4. Major interatomic distances, bond angles and structure factors have been calculated from the step analysis data of the compound. The crys- tal morphology has been examined by scanning electron microscopy. Energy dispersive X-ray (EDX) analysis of the specimens show that yttrium enters into the structural framework of CaTiO3. The particle size of the ceramic phases along major reflection planes ranges between 12 and 40 nm. The polyhedral (CaO8 and TiO6) distortions and valence calculations from bond strength data are also reported. Keywords. Perovskites; powder X-ray diffraction; Rietveld refinement; GSAS; nanoceramic. 1. Introduction 2. Experimental Perovskite type oxides of general formula ABO3 are well 2.1 Ceramic route synthesis of Ca1−x Yx TiO3 (x = 0·1–0·3) known for their property of cationic substitution on A site phases (Goodenough et al 1976; Myhra et al 1986; Ringwood 1985; Shrivastava and Shrivastava 2002). -
A Novel Route to Synthesis of Lead Glycolate and Perovskite Lead Titanate, Lead Zirconate, and Lead Zirconate Titanate (PZT)
36 «“√ “√«‘®—¬ ¡¢. (∫».) 7 (1) : ¡.§. - ¡’.§. 2550 A Novel Route to Synthesis of Lead Glycolate and Perovskite Lead Titanate, Lead Zirconate, and Lead Zirconate Titanate (PZT) via Sol-Gel Process π«—µ°√√¡¢Õß°√–∫«π°“√ —߇§√“–Àå‡≈¥‰°≈‚§‡≈µ·≈–‚§√ß √â“ß·∫∫ ‡æÕ√Õø ‰°µå¢Õ߇≈¥‰∑∑“‡πµ ‡≈¥‡´Õ√å‚§‡πµ ·≈– ‡≈¥‡´Õ√å‚§‡πµ‰∑∑“‡πµ ºà“π°√–∫«π°“√‚´≈-‡®≈ Nuchnapa Tangboriboon (πÿ™π¿“ µ—Èß∫√‘∫Ÿ√≥å)* Dr. Sujitra Wongkasemjit (¥√. ÿ®‘µ√“ «ß»å‡°…¡®‘µµå)** Dr. Alexander M. Jameison (¥√. Õ‡≈Á°´“π‡¥Õ√å ‡ÕÁ¡ ‡®¡‘ —π)*** Dr. Anuvat Sirivat (¥√. Õπÿ«—≤πå »‘√‘«—≤πå)**** ABSTRACT The reaction of lead acetate trihydrate Pb(CH3COO)2.3H2O and ethylene glycol, using triethylenetetramine (TETA) as a catalyst, provides, in one step, an access to a polymer-like precursor of lead glycolate [-PbOCH2CH2O-] via oxide one pot synthesis (OOPS). The lead glycolate precursor has superior electrical properties than lead acetate trihydrate, suggesting that the lead glycolate precursor can possibly be used as a starting material mixed with other precursors such as titanium glycolate and sodium tris (glycozirconate) to produce lead titanate, lead zirconate, and lead zirconate titanate by sol-gel transition process. ∫∑§¥¬— àÕ ß“π«‘®—¬π’ȉ¥â»÷°…“°“√‡°‘¥ªØ‘°‘√‘¬“√–À«à“߇≈¥Õ–´’‡µ¥‰µ√‰Œ‡¥√µ ·≈–‡Õ∑‘≈’π‰°≈§Õ≈‚¥¬„™â “√ ‰µ√‡Õ∑‘≈’π‡µµ√–¡’π‡ªìπ§–µ–≈’ µå‡æ◊ËÕ„™â„π°“√º≈‘µ “√µ—Èßµâπ‚æ≈‘‡¡Õ√å§◊Õ‡≈¥‰°≈‚§‡≈µ [-PbOCH2CH2O-] ∑ ”§’Ë ≠™π— ¥Àπ‘ ßµ÷Ë Õ¢∫«π°“√𔉪„™à „π°“√ â ߇§√“–À— å “√‰¥Õ‡≈§µ√‘ °™π‘ ¥µ‘ “ßÊà ‰¥·°â à “√‡øÕ√‚√‰¥Õå ‡≈§µ√‘ °‘ “√·Õπ‰∑‡øÕ√å‚√Õ‘‡≈§µ√‘°·≈– “√‡æ’¬‚´‰¥Õ‘‡≈§µ√‘°®“°°“√ —߇§√“–Àå¥â«¬ “√ª√–°Õ∫ÕÕ°‰´¥å‡æ’¬ß ¢—ÈπµÕπ‡¥’¬«∑’ˇ√’¬°«à“ Oxide One Pot Synthesis (OOPS) ∑”„À≥⠓√µ—Èßµâπ‡≈¥‰°≈‚§‡≈µ¡’ ¡∫—µ‘∑“߉øøÑ“ ¥’°«à“‡≈¥Õ–´’‡µ¥‰µ√‰Œ‡¥√µ πÕ°®“°π’Ȭ—ß “¡“√∂𔉪„™âº ¡°—∫ “√µ—Èßµâπ™π‘¥Õ◊ËπÊ ‡™àπ ‰∑∑“‡π’¬¡ ‰°≈‚§‡≈µ·≈–‚´‡¥’¬¡∑√’ ‰°≈‚§‡´Õ√å‚§‡πµ‡æ◊ËÕº≈‘µ‡≈¥‰∑∑“‡πµ ‡≈¥‡´Õ√å‚§‡πµ·≈–‡≈¥‡´Õ√å‚§‡πµ ‰∑∑“‡πµ ‚¥¬ºà“π°√–∫«π°“√‚´≈-‡®≈∑√“π ‘™—Ëπ Key Words : OOPS, Sol-gel process, Dielectric materials §” ”§—≠ : OOPS °√–∫«π°“√‚´≈-‡®≈ «— ¥ÿ‰¥Õ‘‡≈§µ√‘° * Ph.D. -
Combustion Synthesis, Sintering, Characterization, and Properties
Hindawi Advances in Materials Science and Engineering Volume 2019, Article ID 9639016, 9 pages https://doi.org/10.1155/2019/9639016 Research Article Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties Siriluk Cherdchom,1 Thitiwat Rattanaphan,1 and Tawat Chanadee 1,2 1Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University (PSU), Hat Yai, Songkhla 90110, &ailand 2Ceramic and Composite Materials Engineering Research Group (CMERG), Center of Excellence in Materials Engineering (CEME), Prince of Songkla University (PSU), Hat Yai, Songkhla 90110, &ailand Correspondence should be addressed to Tawat Chanadee; [email protected] Received 31 August 2018; Revised 20 December 2018; Accepted 3 January 2019; Published 12 February 2019 Academic Editor: Andres Sotelo Copyright © 2019 Siriluk Cherdchom et al. )is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Calcium titanate (CaTiO3) was combustion synthesized from a calcium source of waste duck eggshell, anatase titanium dioxide (A-TiO2), and magnesium (Mg). )e eggshell and A-TiO2 were milled for 30 min in either a high-energy planetary mill or a conventional ball mill. )ese powders were then separately mixed with Mg in a ball mill. After synthesis, the combustion products were leached and then sintered to produce CaTiO3 ceramic. Analytical characterization of the as-leached combustion products revealed that the product of the combustion synthesis of duck eggshell + A-TiO2 that had been high-energy-milled for 30 min before synthesis comprised a single perovskite phase of CaTiO3. -
CRYSTAL SRUKTUR of CALCIUM TITANATE (Catio3) PHOSPHOR DOPED with PRASEODYMIUM and ALUMINIUM IONS
CRYSTAL SRUKTUR OF CALCIUM TITANATE (CaTiO3) PHOSPHOR DOPED WITH PRASEODYMIUM AND ALUMINIUM IONS STRUKTUR KRISTAL FOSFOR KALSIUM TITANIA DIDOPKAN DENGAN ION PRASEODYMIUM DAN ALUMINIUM IONS Siti Aishah Ahmad Fuzi1* and Rosli Hussin2 1 Material Technology Group, Industrial Technology Division, Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor Darul Ehsan, Malaysia. 2 Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 Skudai, Johor 1*[email protected], [email protected] Abstract The past three decades have witnessed rapid growth in research and development of luminescence phenomenon because of their diversity in applications. In this paper, Calcium Titanate (CaTiO3) was studied to find a new host material with desirable structural properties for luminescence-based applications. Solid state reactions o 3+ methods were used to synthesis CaTiO3 at 1000 C for 6 hours. Crystal structure of CaTiO3 co-doped with Pr 3+ and Al were investigated using X-Ray Diffraction (XRD) method. Optimum percentage to synthesis CaTiO3 was 3+ obtained at 40 mol%CaO-60 mol%TiO2 with a single doping of 1 mol%Pr . However, a crystal structure of 4 mol% of Al3+ co-doped with Pr3+ was determined as an optimum parameter which suitable for display imaging. Keywords: calcium titanate, anatase, rutile Abstrak Semenjak tiga dekad yang lalu telah menunjukkan peningkatan yang ketara bagi kajian dan pembangunan dalam bidang fotolumiscen. Peningkatan ini berkembang dengan meluas disebabkan oleh kebolehannya untuk diaplikasikan dalam pelbagai kegunaan harian. Dalam manuskrip ini, kalsium titania (CaTiO3) telah dikaji untuk mencari bahan perumah dengan sifat struktur yang bersesuaian bagi aplikasi luminescen. Tindak balas keadaan o pepejal telah digunakan bagi mensintesis CaTiO3 pada suhu 1000 C selama 6 jam. -
Pdf 1007.44 K
IJE TRANSACTIONS B: Applications Vol. 29, No. 5, (May 2016) 677-687 International Journal of Engineering Journal Homepage: www.ije.ir A Review on Titanium Nitride and Titanium Carbide Single and Multilayer Coatings Deposited by Plasma Assisted Chemical Vapor Deposition a, A. Sabour Rouhaghdamb, S. Ahangaranic٭M. Azadi a Faculty of metallurgical Engineering and material, Semnan University, Semnan, Iran b Faculty of Engineering, Materials Engineering Department, Surface Engineering Laboratory ,Tarbiat Modares University, Tehran, Iran c Advanced Materials and Renewable Energies Department, Iranian Research Organization for Science and Technology, Tehran, Iran P A P E R I N F O ABSTRACT Paper history: In this paper, we reviewed researches about the titanium nitride (TiN) and titanium carbide (TiC) Received 21 September 2015 single and multilayer coatings. These coatings were deposited by the plasma assisted chemical vapor Received in revised form 06 February 2016 deposition (PACVD) technique. Plasma-based technologies are used for the processing of thin films Accepted 4 March 2016 and coatings for different applications such as automobile and aerospace parts, computer disc drives, food industry and surgical/medical instruments. We describe the state of the performance of different Keywords: coating systems and thin film architectures in PACVD suitable for industrial-scale or laboratory Titanium Nitride applications. Mechanical properties of coatings such as wear resistance, hardness and the scratch Titanium Carbide resistance, structural characteristics, physical and chemical properties like coatings adhesion into Multilayer Coatings different substrates, wetting behavior and corrosion resistance were studied. Thus, this paper represents Hard Coatings a source of information for those who want to familiarize with the status of knowledge in the area of Plasma Assisted Chemical Vapor Deposition materials science of functional coatings, in particular TiN/TiC coatings that was deposited by a new Plasma-based technologies. -
Thermal Decomposition of Lead White for Radiocarbon Dating of Paintings
Thermal decomposition of lead white for radiocarbon dating of paintings Lucile Beck, Cyrielle Messager, Stéphanie Coelho, Ingrid Caffy, Emmanuelle Delqué-Količ, Marion Perron, Solène Mussard, Jean-Pascal Dumoulin, Christophe Moreau, Victor Gonzalez, et al. To cite this version: Lucile Beck, Cyrielle Messager, Stéphanie Coelho, Ingrid Caffy, Emmanuelle Delqué-Količ, et al.. Thermal decomposition of lead white for radiocarbon dating of paintings. Radiocarbon, University of Arizona, 2019, 61, pp.1345-1356. 10.1017/RDC.2019.64. cea-02183134 HAL Id: cea-02183134 https://hal-cea.archives-ouvertes.fr/cea-02183134 Submitted on 15 Jun 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. THERMAL DECOMPOSITION OF LEAD WHITE FOR RADIOCARBON DATING OF PAINTINGS Lucile Beck1* • Cyrielle Messager1 • Stéphanie Coelho1 • Ingrid Caffy1 • Emmanuelle Delqué- Količ1 • Marion Perron1 • Solène Mussard1 • Jean-Pascal Dumoulin1 • Christophe Moreau1 • Victor Gonzalez2 • Eddy Foy3 • Frédéric Miserque4 • Céline Bonnot-Diconne5 1Laboratoire de Mesure du Carbone 14 (LMC14), LSCE/IPSL, -
New Simple Procedure to Produce White Lead for Special Use in The
G Model CULHER-3147; No. of Pages 6 ARTICLE IN PRESS Journal of Cultural Heritage xxx (2017) xxx–xxx Available online at ScienceDirect www.sciencedirect.com Original article New simple procedure to produce white lead for special use in the plastic arts and in restoration a,b,∗ b Nuria Pérez-Villares , Rafael Bailón-Moreno a Department of Painting, Granada University, 18071 Granada, Spain b Department of Chemical Engineering, Granada University, 18071 Granada, Spain a r t i c l e i n f o a b s t r a c t Article history: Paints based on the pigment white lead have traditionally been used in art. Currently, however, this Received 12 February 2016 pigment is difficult to find, either in powder or in paint, with sufficient purity and without undesired Accepted 8 November 2016 additives. Furthermore, the traditional methods of producing it are not feasible to use in the studio or Available online xxx laboratory. Therefore, the present work proposes a new method of producing the pigment on a small scale, to be used in the fields of the plastic arts, in restoration of works of art, and in research. The method Keywords: consists of precipitating white lead from aqueous solutions of lead nitrate and sodium carbonate. The White lead procedure is simple, quick, and without unpleasant materials or handling, and the resulting pigment is Restoration of great purity and similar to traditional white lead. Fine arts Pigment © 2017 Elsevier Masson SAS. All rights reserved. Procedure Chemical synthesis 1. Introduction laboratory or in the studio [2]. Historically, numerous methods were used for industrial production [3]. -
Circular of the Bureau of Standards No. 539 Volume 5: Standard X-Ray
: :;.ta^4aya9 . Bl.ig NBS CIRCULAR 539 VOLUME V Reference taken Standard X-ray Diffraction Powder Patterns UNITED STATES DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS Standard X-ray Diffraction Powder Patterns The four previously issued volumes in this series are avail- able from the Superintendent of Documents, U. S. Govern- ment Printing Office, Washington 25, D. C., as follows: NBS Circular 539, Volume I, Standard X-ray Diffraction Powder Patterns (Data for 54 inorganic substances) NBS Circular 539, Volume II, Standard X-ray Diffraction Powder Patterns (Data for 30 inorganic substances) NBS Circular 539, Volume III, Standard X-ray Diffraction Powder Patterns (Data for 34 inorganic substances) NBS Circular 539, Volume IV, Standard X-ray Diffraction Powder Patterns (Data for 42 inorganic substances) The price of each volume is 45 cents. Send orders with remittance to: Superintendent of Documents, Government Printing Office, Washington 25, D. C. UNITED STATES DEPARTMENT OF COMMERCE • Sinclair Weeks, Secretary NATIONAL BUREAU OF STANDARDS • A. V. Astin, Director Standard X-ray Diffraction Powder Patterns Howard E. Swanson, Nancy T. Gilfrich, and George M. Ugrinic National Bureau of Standards Circular 539 Volume V, Issued October 21, 1955 For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C. Price 45 cents CONTENTS Page Page Introduction 1 Standard X-ray powder patterns—Continued Standard X-ray powder patterns: Lead titanate, PbTi0 3 39 Ammonium chloroplatinate, (NH 4 ) 2 PtCl 6 3 Magnesium tin, Mg 2 Sn 41 Ammonium chlorostannate, (NH 4 ) 2 SnCl 6 4 Magnesium titanate (geikielite), MgTi0 3 43 Ammonium fluosilicate (cryptohalite), Manganese (II) oxide, (manganosite) MnO._ 45 (NH 4 ) 2 SiF6 5 Molybdenum disulfide (molybdenite), MoS 2 _.