Site Identity and Importance in Cosubstituted Bixbyite In2o3
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Redalyc.Mineralogical Study of the La Hueca Cretaceous Iron-Manganese
Revista Mexicana de Ciencias Geológicas ISSN: 1026-8774 [email protected] Universidad Nacional Autónoma de México México Corona Esquivel, Rodolfo; Ortega Gutiérrez, Fernando; Reyes Salas, Margarita; Lozano Santacruz, Rufino; Miranda Gasca, Miguel Angel Mineralogical study of the La Hueca Cretaceous Iron-Manganese deposit, Michoacán, south-western Mexico Revista Mexicana de Ciencias Geológicas, vol. 17, núm. 2, 2000, pp. 142-151 Universidad Nacional Autónoma de México Querétaro, México Available in: http://www.redalyc.org/articulo.oa?id=57217206 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Revista Mexicana de Ciencias Geológicas, volumen 17, número 2, 143 2000, p. 143- 153 Universidad Nacional Autónoma de México, Instituto de Geología, México, D.F MINERALOGICAL STUDY OF THE LA HUECA CRETACEOUS IRON- MANGANESE DEPOSIT, MICHOACÁN, SOUTHWESTERN MEXICO Rodolfo Corona-Esquivel1, Fernando Ortega-Gutiérrez1, Margarita Reyes-Salas1, Rufino Lozano-Santacruz1, and Miguel Angel Miranda-Gasca2 ABSTRACT In this work we describe for the first time the mineralogy and very briefly the possible origin of a banded Fe-Mn deposit associated with a Cretaceous volcanosedimentary sequence of the southern Guerrero terrane, near the sulfide massive volcanogenic deposit of La Minita. The deposit is confined within a felsic tuff unit; about 10 meters thick where sampled for chemical analysis. Using XRF, EDS and XRD techniques, we found besides todorokite, cryptomelane, quartz, romanechite (psilomelane), birnessite, illite-muscovite, cristobalite, chlorite, barite, halloysite, woodruffite, nacrite or kaolinite, and possibly hollandite-ferrian, as well as an amorphous material and two unknown manganese phases. -
Metamorphism of Sedimentary Manganese Deposits
Acta Mineralogica-Petrographica, Szeged, XX/2, 325—336, 1972. METAMORPHISM OF SEDIMENTARY MANGANESE DEPOSITS SUPRIYA ROY ABSTRACT: Metamorphosed sedimentary deposits of manganese occur extensively in India, Brazil, U. S. A., Australia, New Zealand, U. S. S. R., West and South West Africa, Madagascar and Japan. Different mineral-assemblages have been recorded from these deposits which may be classi- fied into oxide, carbonate, silicate and silicate-carbonate formations. The oxide formations are represented by lower oxides (braunite, bixbyite, hollandite, hausmannite, jacobsite, vredenburgite •etc.), the carbonate formations by rhodochrosite, kutnahorite, manganoan calcite etc., the silicate formations by spessartite, rhodonite, manganiferous amphiboles and pyroxenes, manganophyllite, piedmontite etc. and the silicate-carbonate formations by rhodochrosite, rhodonite, tephroite, spessartite etc. Pétrographie and phase-equilibia data indicate that the original bulk composition in the sediments, the reactions during metamorphism (contact and regional and the variations and effect of 02, C02, etc. with rise of temperature, control the mineralogy of the metamorphosed manga- nese formations. The general trend of formation and transformation of mineral phases in oxide, carbonate, silicate and silicate-carbonate formations during regional and contact metamorphism has, thus, been established. Sedimentary manganese formations, later modified by regional or contact metamorphism, have been reported from different parts of the world. The most important among such deposits occur in India, Brazil, U.S.A., U.S.S.R., Ghana, South and South West Africa, Madagascar, Australia, New Zealand, Great Britain, Japan etc. An attempt will be made to summarize the pertinent data on these metamorphosed sedimentary formations so as to establish the role of original bulk composition of the sediments, transformation and reaction of phases at ele- vated temperature and varying oxygen and carbon dioxide fugacities in determin- ing the mineral assemblages in these deposits. -
Mineral Processing
Mineral Processing Foundations of theory and practice of minerallurgy 1st English edition JAN DRZYMALA, C. Eng., Ph.D., D.Sc. Member of the Polish Mineral Processing Society Wroclaw University of Technology 2007 Translation: J. Drzymala, A. Swatek Reviewer: A. Luszczkiewicz Published as supplied by the author ©Copyright by Jan Drzymala, Wroclaw 2007 Computer typesetting: Danuta Szyszka Cover design: Danuta Szyszka Cover photo: Sebastian Bożek Oficyna Wydawnicza Politechniki Wrocławskiej Wybrzeze Wyspianskiego 27 50-370 Wroclaw Any part of this publication can be used in any form by any means provided that the usage is acknowledged by the citation: Drzymala, J., Mineral Processing, Foundations of theory and practice of minerallurgy, Oficyna Wydawnicza PWr., 2007, www.ig.pwr.wroc.pl/minproc ISBN 978-83-7493-362-9 Contents Introduction ....................................................................................................................9 Part I Introduction to mineral processing .....................................................................13 1. From the Big Bang to mineral processing................................................................14 1.1. The formation of matter ...................................................................................14 1.2. Elementary particles.........................................................................................16 1.3. Molecules .........................................................................................................18 1.4. Solids................................................................................................................19 -
Compositional Characteristics of Kinoshitatite from the Sausar Group
American Mineralogist, Volume 74, pages 200-202, 1989 Compositionalcharacteristics of kinoshitatite from the SausarGroup, India SoNrN,q.rHD,c.scuprA., Slun Crr,cxRAnonrr, Puul.r SnNcurra, P. K. BnarrAcHARyA! H. BlNrn"rnn Centre of Advanced Study in Economic Geology, Department of Geological Sciences,Jadavpur University, Calcutta-700 032, India M. Furuoxe Department of Geology, Kyushu University, Fukuoka, Japan Anstnlcr Ba-rich and Ba-poor micas with varying Mn and Mg content in octahedralsites coexist in isolated pockets in braunite-bixbyite-hausmanniteores that have been invaded by late silicic pegmatite and carbonateveins in the SausarGroup, India. The micas are secondary in nature and are pseudomorphsafter carbonatesand alkali feldspars.One of the micas approachesclosely synthetic end-memberkinoshitalite, BaMgrAlrSirO,o(OH)..The present study shows a complete solid solution between the K (phlogopite) and Ba (kinoshitalite) end-members.Compositional diversities in these micas are attributable to the different minerals that the micas replaced. INlnolucrroN lites. Micas havedeveloped in manganeseoxide-rich rocks Krnoshitalite, BaMg.AlrSirOr0(OH)r, was defined by wherethe latter have beeninvaded by late silicic pegmatite Yoshii et al. (1973a)as the Ba and Mg trioctahedralbrit- and carbonateveins. In thesepockets, the manganeseox- tle mica. As an end-member, it is known only as a syn- ide-rich rocks exhibit the following mineral assemblage: thetic phase obtained hydrothermally at 600 "C and 2 braunite * hausmannite + bixbyite * Ba-bearingmica kbar (Frondel and Ito, 1967). Naturally occurring ki- + alkali feldspar + hematite * calcite + dolomite + noshitalite has been reported with considerableamounts qtrartz. The oxides collectively account for over 800/oof of K and Mn (Yoshii et al., l9l3b; Yoshii and Maeda, the rock. -
Manganese Deposits of Western Utah
Manganese Deposits of Western Utah GEOLOGICAL SURVEY BULLETIN 979-A Manganese Deposits of Western Utah By MAX D. CRITTENDEN, JR. , MANGANESE DEPOSITS OF UTAH, PART 1 GEOLOGICAL SURVEY BULLETIN 979-A A report on known deposits west of the lllth meridian * UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 19S1 UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. - Price 50 cents (paper cover) CONTENTS Fag* Abstract.__________________________________________________________ 1 Introduction._._____.__________----_______-______-_--_------.__-__ 1 History of mining and production__.._______.______.___.__-___-_____ 2 Occurrence and age of the deposits_________-_____-_.-__-__-_-__--_- 6 Mineralogy _--____._____---_--_---_------------------------------- 7 Descriptions of the manganese minerals....____.__--_____-__-..__ 8 Oxides...___-__.--_--------___-_-_.-- . _ 8 Carbonates.___-____.__-____________-_-___-----_--------__ 9 Silicate.,_ _____-----_____--__-_______-_---___-__--___._--. 9 Relative stability and manganese content______--_----------_----_ 10 Oxidation and enrichment._____________________________________ 10 Classification and origin of the deposits....______.__._____---.___.-_-_ 11 General discussion_____________________________________________ 11 Syngenetic deposits_-_--____-----_--------------_-------__-_-.- 13 Bedded depositS-__________-_____._____..__________________ 13 Spring -
Theoretical Study of Ternary Cosp Semiconductor
Theoretical Study of Ternary CoSP Semiconductor: a Candidate for Photovoltaic Applications Abdesalem Houari∗ and Fares Benissad Theoretical Physics Laboratory, Department of Physics, University of Bejaia, Bejaia, Algeria (Dated: March 24, 2020) Abstract The electronic structure of pyrite-type cobalt phosphosulfide (CoSP) has been studied using density-functional theory. The calculated band structure reveals the non-magnetic semiconducting character of the compound. The electronic structure is described through the electronic band structure and the densities of states. A band gap of 1.14 eV has been computed within standard GGA, a value which is enhanced using hybrid functional. It separates the upper part of the valence band dominated by Co-3d-t2g states from the lower part of the conduction band made exclusively of Co-3d-eg, above of which lie S-3p and P-3p ones. The obtained values are suitable for applications in solar cells, according to Shockley-Queisser theory of light to electric conversion efficiency. The origin of the larger CoSP band gap, with respect to the one of the promising FeS2 compound, is explained and the chemical bonding properties are addressed. A comparative picture is established where several similarities have been found, suggesting that CoSP could be for a great practical interest in photovoltaics. arXiv:2003.09864v1 [cond-mat.mtrl-sci] 22 Mar 2020 ∗corresponding author:[email protected] 1 Contents I. Introduction 2 II. Computational Method 4 III. Results and Discussions 5 IV. Summary and Conclusion 9 Acknowledgments 10 References 10 I. INTRODUCTION Pyrite-type iron disulfide (FeS2) is considered as a promising material for photovoltaic applications [1–3]. -
Crystengcomm Accepted Manuscript
CrystEngComm Accepted Manuscript This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication. Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available. You can find more information about Accepted Manuscripts in the Information for Authors. Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal’s standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. www.rsc.org/crystengcomm Page 1 of 31 CrystEngComm In-situ Neutron Powder Diffraction Study of the Reaction M2O3↔M3O4↔MO, M === (Fe 0.2 Mn 0.8 ): Implications for Chemical Looping with Oxygen Uncoupling. S.T. Norberg 1,2 , G. Azimi 1, S. Hull 2, and H. Leion 1. 1 Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden. Manuscript 2 The ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom. Accepted Corresponding Author: Stefan T. Norberg. Address: Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden. -
Application of Composition Controlled Nickel-Alloyed Iron Sulfide Pyrite Nanocrystal Thin Films As the Hole Transport
Journal of Materials Chemistry C View Article Online PAPER View Journal Application of composition controlled nickel-alloyed iron sulfide pyrite nanocrystal thin films as the hole Cite this: DOI: 10.1039/c7tc00948h transport layer in cadmium telluride solar cells† Ebin Bastola, Khagendra P. Bhandari and Randy J. Ellingson* Here, we report hot-injection colloidal synthesis, characterization, and control of electronic conductivity of nickel-alloyed iron sulfide (NixFe1ÀxS2) pyrite nanocrystals (NCs). The Ni-alloyed iron pyrite NCs were synthesized using iron (Fe) and nickel (Ni) bromides as Fe and Ni sources, and elemental sulfur (S) as a sulfur source. As Ni is incorporated into the iron pyrite (FeS2) NCs, the X-ray diffraction (XRD) peaks shift towards lower diffraction angles indicating higher lattice constants of the alloyed NCs in accord with Vegard’s law. Scherrer-analysis and scanning electron microscopy (SEM) imaging indicate that the average particle sizes of alloyed NCs are smaller compared to pure FeS2 NCs. In UV-Vis-NIR spectra, the alloyed NCs have higher absorbance in the infrared (IR) region than pure FeS2 NCs indicating Ni-alloyed NCs have higher densities of mid-band gap defect states. Based on thermal probe and Hall-effect measurements, the majority charge carriers in these alloyed NCs depend upon the material Received 3rd March 2017, composition. Pure iron pyrite (FeS2) and Ni0.1Fe0.9S2 NCs show p-type conductivity while Ni0.2Fe0.8S2 Accepted 6th May 2017 and higher Ni concentration alloys exhibit n-type conductivity. Application of these alloyed NC thin films DOI: 10.1039/c7tc00948h as the hole transport layer for CdTe solar cells revealed that Ni0.05Fe0.95S2 NCs perform best with the average increase in efficiency of B5%, with the best cell performing up to 8% better than the laboratory rsc.li/materials-c standard copper/gold (Cu/Au) cell. -
Two-Dimensional Shape Memory Graphene Oxide
ARTICLE Received 18 Dec 2015 | Accepted 17 May 2016 | Published 21 Jun 2016 DOI: 10.1038/ncomms11972 OPEN Two-dimensional shape memory graphene oxide Zhenyue Chang1,2, Junkai Deng3, Ganaka G. Chandrakumara1,2, Wenyi Yan1 & Jefferson Zhe Liu1,2 Driven by the increasing demand for micro-/nano-technologies, stimuli-responsive shape memory materials at nanoscale have recently attracted great research interests. However, by reducing the size of conventional shape memory materials down to approximately nanometre range, the shape memory effect diminishes. Here, using density functional theory calcula- tions, we report the discovery of a shape memory effect in a two-dimensional atomically thin graphene oxide crystal with ordered epoxy groups, namely C8O. A maximum recoverable strain of 14.5% is achieved as a result of reversible phase transition between two intrinsically stable phases. Our calculations conclude co-existence of the two stable phases in a coherent crystal lattice, giving rise to the possibility of constructing multiple temporary shapes in a single material, thus, enabling highly desirable programmability. With an atomic thickness, excellent shape memory mechanical properties and electric field stimulus, the discovery of a two-dimensional shape memory graphene oxide opens a path for the development of exceptional micro-/nano-electromechanical devices. 1 Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia. 2 Monash Centre for Atomically Thin Materials, Monash University, Clayton, Victoria 3800, Australia. 3 State Key Laboratory for Mechanical Behaviour of Materials, Xi’an Jiaotong University, Xi’an 710049, China. Correspondence and requests for materials should be addressed to J.Z.L. (email: [email protected]). -
PETROGENETIC GRIDS from EXPERIMENTAL DATA in the SYSTEM Mn-Si-C-O-H
Revista Brasileira de GeQcitncias Volume 4, 1974 15 PETROGENETIC GRIDS FROM EXPERIMENTAL DATA IN THE SYSTEM Mn-Si-C-O-H TJERK PETERS*, JOSE VICENTE VALARELLI**, and MARIA ANGELA F. CANDIA** ABSTRACT Experimental data in the system Mn-Si-C-O-H are reviewed and equations for equilibrium reactions among common manganese 'minerals are given. With these equa tions T -log f 02 diagrams were constructed, that can be used as petrogenetic grids to evaluate the physical-chemical conditions during the metamorphism of manganese protores. The strong influence of the composition of the fluid phase on the equilibrium temperatures is emphasized. Applications to some natural metamorphic Mn-deposits are shown. RESUMO A reuniao de trabalhos experimentais envolvendo equilibrio entre minerais de man ganes e de curvas teoricas de dados termodinamicoe referentes ao sistema Mn-Si-G--O--'-H, fornece uma visne do conjunto das parageneses mineral6gicas possiveis de serem encontradas em protominerioa e .minerios metam6rficos naturals. Neste trabalho sao fornecidos diagramas isobaricos em funcao de temperatura e fugacidade de oxigenio de onde se tiram informacoes sobre 0 campo de estabilidade dos minerais de manganes mais comuns desse sistema. Au-aves desses diagramas podem-se interpretar as condicoes fisico-quimicae reinantes ou trans corridas durante 0 metamorfismo, dando-se enfase a influencia da composicao da fase fluida (C02 , 02 e H 20, por exemplo) no deslocamento dos equilibrios. Sao dados exemplos de aplicacao desses diagramas c~m base nos dados existentes sobre as pa rageneses de dais dep6sitos de manganes: Morro da Mina (Lafaiete, MG) e Maran (Bahia). INTRODUCTION Experimental data at elevated pressures and temperatures for systems containing manganese are rather scarce, although manganese is a common element in most natural rocks. -
A Specific Gravity Index for Minerats
A SPECIFICGRAVITY INDEX FOR MINERATS c. A. MURSKyI ern R. M. THOMPSON, Un'fuersityof Bri.ti,sh Col,umb,in,Voncouver, Canad,a This work was undertaken in order to provide a practical, and as far as possible,a complete list of specific gravities of minerals. An accurate speciflc cravity determination can usually be made quickly and this information when combined with other physical properties commonly leads to rapid mineral identification. Early complete but now outdated specific gravity lists are those of Miers given in his mineralogy textbook (1902),and Spencer(M,i,n. Mag.,2!, pp. 382-865,I}ZZ). A more recent list by Hurlbut (Dana's Manuatr of M,i,neral,ogy,LgE2) is incomplete and others are limited to rock forming minerals,Trdger (Tabel,l,enntr-optischen Best'i,mmungd,er geste,i,nsb.ildend,en M,ineral,e, 1952) and Morey (Encycto- ped,iaof Cherni,cal,Technol,ogy, Vol. 12, 19b4). In his mineral identification tables, smith (rd,entifi,cati,onand. qual,itatioe cherai,cal,anal,ys'i,s of mineral,s,second edition, New york, 19bB) groups minerals on the basis of specificgravity but in each of the twelve groups the minerals are listed in order of decreasinghardness. The present work should not be regarded as an index of all known minerals as the specificgravities of many minerals are unknown or known only approximately and are omitted from the current list. The list, in order of increasing specific gravity, includes all minerals without regard to other physical properties or to chemical composition. The designation I or II after the name indicates that the mineral falls in the classesof minerals describedin Dana Systemof M'ineralogyEdition 7, volume I (Native elements, sulphides, oxides, etc.) or II (Halides, carbonates, etc.) (L944 and 1951). -
Norrishite, K(Mn2 3+Li)Si4o10(O)2, an Oxymica Associated with Sugilite
American Mineralogist, Volume 88, pages 189–194, 2003 3+ Norrishite, K(Mn2 Li)Si4O10(O)2, an oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating EDWIN GNOS,1,* THOMAS ARMBRUSTER,2 AND IGOR M. VILLA1 1Intitut für Geologie, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland 2Laboratorium für Chemische und Mineralogische Kristallographie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland ABSTRACT 3+ Norrishite, K(Mn2 Li)Si4O10(O)2, an OH-free mica, is found in a silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. The mineral forms centimeter-sized black aggregates in dark-purple sugilite, and is associated with kornite and Mn-rich pectolite. Single-crystal X-ray data, collected on norrishite of end-member composition, yielded a mono- clinic C2/m lattice with a = 5.291(2), b = 8.904(2), c = 10.049(4) Å, b = 98.15(5)∞, V = 920.6 Å3, and Z = 2, characteristic of the 1M polytype. 40Ar-39Ar analyses on a gem-quality sugilite yielded an age of 1048.1 ± 5.9 Ma interpreted as a mineral crystallization age that dates the main hydrothermal event that led to enrichment of the Mn ore. The norrishite age data are more complex and suggest a crystallization age ª1010 Ma and a subsequent alteration at ca. 850 Ma. The age results obtained suggest that the hydrothermal activity is related to the collision and tectonism affecting the edges of the Kalahari craton, and show that sugilite, and probably also unaltered norrishite, are suitable for dating metamorphism.