Download or read book Investigations of the Chemistry of Silicate Melts microform Kinetics Structure and Redox Equilibria written by John Todd Dunn and published by National Library of Canada. This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of investigations of the diffusion of oxygen in silicate melts, the structure of melts, and the redox equilibria in silicate melts are presented in this thesis. Five separate investigations were undertaken, all of which were directed toward gaining an understanding of the chemistry of silicate melts, and in particular the role played by oxygen in those melts. The diffusion of oxygen was investigated in six different melt compositions. Three of the compositions were in the synthetic system diopside-anorthite. Oxygen diffusion was measured in those melts at one bar pressure by means of isotopic exchange. The diffusivities determined are similar in magnitude to divalent cation diffusivities and obey the compensation law for the diffusion of divalent cations in silicate melts. Those observations suggest that there is a significant contribution to the diffusivity of oxygen from a "cation-like" diffusion mechanism. Eyring model calculations, using the oxygen diffusion data and melt viscosity data from the literature, suggest that the size of the average diffusing species is similar to that of the Si0 4 4 " anion. The diffusion of oxygen was also measured in three basaltic melts (an olivine nephelinite, an alkali basalt, and a tholeiitic basalt) at various temperatures and pressures up to 21 kilobars. The diffusivities were determined by monitoring the rate of reduction of Fe 3+ to Fe 2 + in the melts. The oxygen diffusivities measured are approximately the same as, or slightly greater than, divalent cation diffusivities in basaltic liquids. The diffusivity of oxygen shows an abrupt decrease in all three melts at approximately the same pressure as the change in the liquidus phase from olivine to pyroxene. The decreases in oxygen diffusivity are interpreted as being related to decreases in the proportion of 0 2 ' anion in the melts during reactions which decrease the proportion of olivine building units and increase the proportion of pyroxene building units in the melt. The results suggest that oxygen diffuses principally as the 0 2 ' anion in basaltic melts. The structure of lead orthosilicate melts was investigated as a function of the thermal history of the melt by means of infrared spectroscopy. The melts were observed to become increasingly polymerized with decreasing rate of cooling and with increasing duration of isothermal soaking. The presence of silicate anions larger than Si0 4 4- in the melts was demonstrated, which requires that 0 2 ' anions also be present. The proportion of 0 2 " anions in Pb 2 Si0 4 melts depends on the thermal history. Therefore, the ratio of non-bridging oxygens to tetrahedral cations (NBO/T) also depends on thermal history. The study of the structure of Pb 2 Si0 4 melts provides direct evidence of the presence of 0 2 ' anions in an orthosilicate melt. That result when combined with the implications of the diffusion studies suggests that 0 2 ' anions are present in much more polymerized melts and that the proportion of those anions in a given melt depends on the thermal history of the melt. That suggestion requires that melt models which do not incorporate 0 2 " anions be reassessed. The two investigations of iron redox equilibria in basaltic melts provide an improved predictive equation for the oxidation of iron which may account for (graphite and Fe°) in too oxidized to allow in natural melts and a model process the presence of reduced phases quenched rocks which are apparently those phases.
Download or read book Structure and Properties of Silicate Melts written by Bjorn O. Mysen and published by Elsevier Publishing Company. This book was released on 1988 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization of the relationships between structure and properties of materials is based on the fundamental principle that the structure of the material be determined first, followed by assessments of which structural properties may govern their properties as a function of composition, pressure, temperature and other variables. Whereas this methodology has been successfully applied to further our understanding of crystalline materials, studies of silicate melt structure are often conducted on a somewhat different basis. Rather than from direct structural determination, structure models have been developed from assumed relationships between a specific melt property and its structure. As a result, a multitude of models has evolved - many of which are mutually exclusive. The overall scope of this book is to address properties and processes of magmatic systems from the vantage point of melt structure. To this end available data in chemically increasingly complex systems are reviewed and discussed with the ultimate goal being integration of the simple system data into a model that describes complex systems such as natural magmatic liquids. Thus the book evolves from the simplest possible system, SiO 2 , to complex systems such as natural magmatic liquids. From a petrologic point of view, sufficient data have been obtained so that a general framework of the structure of magmatic liquids is in place. This framework is based on the same principles as those of crystal chemistry, modulated by the absence of long range order in amorphous material, and systematic relationships between structure and properties can be discerned at least at atmospheric pressure.
Download or read book Structure and Kinetics of Silicate Melts and Glasses written by James David Kubicki and published by . This book was released on 1989 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Spectroscopic and Viscosimetric Investigation of the Structure of Silicate Melts written by Dan Sykes and published by . This book was released on 1991 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure Dynamics and Properties of Silicate Melts written by Jonathan Farwell Stebbins and published by . This book was released on 1995 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mineralogical Society of America sponsored a short course for which this was the text at Stanford University December 9 and 10, 1995, preceding the Fall Meeting of the American Geophysical Union and MSA in San Fransisco, with about 100 professionals and graduate students in attendance. A silicate melt phase is the essential component of nearly all igneous processes, with dramatic consequences for the properties of the Earth's interior. Throughout Earth history and continuing to the present day, silicate melts have acted as transport agents in the chemical and physical differentiation of the Earth into core, mantle and crust. The occurrence of such magmatic processes leads to the definition of our planet as "active," and the resulting volcanism has a profound impact on the Earth's atmosphere, hydrosphere and biosphere. Although near-surface melts are observed directly during volcanic eruptions, the properties of magmas deep within the Earth must be characterized and constrained by laboratory experiments. Many of these experiments are designed to aid in developing an atomic level understanding of the structure and dynamics of silicate melts under the P- T conditions of the Earth's crust and mantle, which will make extrapolation from the laboratory results to the behavior of natural magmas as reliable as possible. Silicate melts are also the archetypal glass-forming materials. Because of the ready availability of raw materials, and the ease with which molten silicates can be vitrified, commercial "glass" has necessarily implied a silicate composition, over most of the history of glass technology. The properties of the melt, or "slag" in metallurgical extractions, determine the nature of the glass formed, and the needs of the glass industry have provided much of the impetus for understanding the structure-property relations of molten silicates as well as for the glasses themselves. It is now recognized that any liquid might become glassy, if cooled rapidly enough, and understanding the thermodynamic and kinetic aspects of the glass transition, or passage between the liquid and glassy states of matter, has become a subject of intense interest in fundamental physics and chemistry. Glasses have also been studied in many geochemical investigations, often as substitutes for the high temperature melts, with the results being extrapolated to the liquid state. In many cases, in situ techniques for direct investigation of these refractory systems have only recently become available. Much valuable information concerning the melt structure has been gleaned from such studies. Nevertheless, there are fundamental differences between the liquid and glassy states. In liquids, the structure becomes progressively more disordered with increasing temperature, which usually gives rise to major changes in all thermodynamic properties and processes. These changes must, in general, be investigated directly by in situ studies at high temperature. Studies of glass only represent a starting point, which reflect a frozen image of the melt "structure" at the glass transition temperature. This is generally hundreds of degrees below the near-liquid's temperatures of greatest interest to petrologists. Since the early 1980s, a much deeper understanding of the structure, dynamics, and properties of molten silicates has been developed within the geochemical community, applying techniques and concepts developed within glass science, extractive metallurgy and liquid state physics. Some of these developments have far-reaching implications for igneous petrology. The purpose of this Short Course and volume is to introduce the basic concepts of melt physics and relaxation theory as applied to silicate melts, then to describe the current state of experimental and computer simulation techniques for exploring the detailed atomic structure and dynamic processes which occur at high temperature, and finally to consider the relationships between melt structure, thermodynamic properties and rheology within these liquids. These fundamental relations serve to bridge the extrapolation from often highly simplified melt compositions studied in the laboratory to the multicomponent systems found in nature. This volume focuses on the properties of simple model silicate systems, which are usually volatile-free. The behavior of natural magmas has been summarized in a previous Short Course volume (Nicholls and Russell, editors, 1990: Reviews in Mineralogy, Vol. 24), and the effect of volatiles on magmatic properties in yet another (Carroll and Holloway, editors, 1994: Vol. 30). In the chapters by Moynihan, by Webb and Dingwell, and by Richet and Bottinga, the concepts of relaxation and the glass transition are introduced, along with techniques for studying the rheology of silicate liquids, and theories for understanding the transport and relaxation behavior in terms of the structure and thermodynamic properties of the liquid. The chapter by Dingwell presents applications of relaxation-based studies of melts in the characterization of their properties. Chapters by Stebbins, by Brown, Farges and Calas, and by McMillan and Wolf present the principal techniques for studying the melt structure and atomic scale dynamics by a variety of spectroscopic and diffraction methods. Wolf and McMillan summarize our current understanding of the effects of pressure on silicate glass and melt structure. Chapters by Navrotsky and by Hess consider the thermodynamic properties and mixing relations in simple and multicomponent aluminosilicate melts, both from a fundamental structural point of view and empirical chemical models which can be conveniently extrapolated to natural systems. The chapter by Chakraborty describes the diffusivity of chemical species in silicate melts and glasses, and the chapter by Poole, McMillan and Wolf discusses the application of computer simulation methods to understanding the structure and dynamics of molten silicates. The emphasis in this volume is on reviewing the current state of knowledge of the structure, dynamics and physical properties of silicate melts, along with present capabilities for studying the molten state under conditions relevant to melting within the Earth, with the intention that these techniques and results can then be applied to understanding and modeling both the nature of silicate melts and the role of silicate melts in nature.
Download or read book Introduction to Geochemistry written by Cl.J. Allègre and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: TO GEOCHEMISTRY by CLAUDE-JEAN ALLEGRE Department of Earth Sciences, University of Paris 7 and GIL MICHARD Department of Chemistry, University of Paris 7 D, REIDEL PUBLISHING COMPANY DORDRECHT-HOLLAND / BOSTON-U. S. A. INTRODUCTION A LA GEOCHIMIE First published by Presses Universitaires de France, Paris, 1973 Translated/rom the French by Robert N. Varney Library of Congress Catalog Card Number 74-83871 e-ISBN -13: 978-94 -010-2261-3 ISBN -13: 978-90-277-0498-6 DOl: 10. 1007/978-94-010-2261-3 Published by D. Reidel Publishing Company, P. O. Box 17, Dordrecht, Holland Sold and distributed in the U. S. A. , Canada, and Mexico by D. Reidel Publishing Company, Inc. 306 Dartmouth Street, Boston, Mass. 02116, U. S. A. All Rights Reserved Copyright © 1974 by D. Reidel Publishing Company, Dordrecht, Holland No part of this book may be reproduced in any form, by print, photoprint, microfilm, or any other means, without written permission from the publisher TABLE OF CONTENTS PREFACE IX PREFACE BY THE TRANSLATOR XI CHAPTER 1 / THE EARTH AS A CHEMICAL SYSTEM 1 1. 1. The Earth within the Solar System 1 1. 2. The Scale of Time 1 1. 3. The Overall Chemical Composition of the Earth, the Solar System, and the Universe 2 1. 4. Chemical Compounds in the Solar System: Cosmological Minerals 5 1. 4. 1. Simple Molecules 6 1. 4. 2. Simple Solids 6 1. 4. 3. Silicates 6 1. 4. 4. Carbon Polymers 6 1. 4. 5. Fe-Ni Alloys 6 1. 5.
Download or read book Advanced Mineralogy written by A.S. Marfunin and published by Springer. This book was released on 1994-08-23 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: All existing introductory reviews of mineralogy are written accord ing to the same algorithm, sometimes called the "Dana System of Mineralogy". Even modern advanced handbooks, which are cer tainly necessary, include basic data on minerals and are essentially descriptive. When basic information on the chemistry, structure, optical and physical properties, distinguished features and para genesis of 200-400 minerals is presented, then there is practically no further space available to include new ideas and concepts based on recent mineral studies. A possible solution to this dilemma would be to present a book beginning where introductory textbooks end for those already famil iar with the elementary concepts. Such a volume would be tailored to specialists in all fields of science and industry, interested in the most recent results in mineralogy. This approach may be called Advanced Mineralogy. Here, an attempt has been made to survey the current possibilities and aims in mineral matter investigations, including the main characteristics of all the methods, the most important problems and topics of mineral ogy, and related studies. The individual volumes are composed of short, condensed chap ters. Each chapter presents in a complete, albeit condensed, form specific problems, methods, theories, and directions of investigations, and estimates their importance and strategic position in science and industry.
Download or read book Mechanochemistry in Nanoscience and Minerals Engineering written by Peter Balaz and published by Springer Science & Business Media. This book was released on 2008-10-20 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanochemistry as a branch of solid state chemistry enquires into processes which proceed in solids due to the application of mechanical energy. This provides a thorough, up to date overview of mechanochemistry of solids and minerals. Applications of mechanochemistry in nanoscience with special impact on nanogeoscience are described. Selected advanced identification methods, most frequently applied in nanoscience, are described as well as the advantage of mechanochemical approach in minerals engineering. Examples of industrial applications are given. Mechanochemical technology is being applied in many industrial fields: powder metallurgy (synthesis of nanometals, alloys and nanocompounds), building industry (activation of cements), chemical industry (solid waste treatment, catalyst synthesis, coal ashes utilization), minerals engineering (ore enrichment, enhancement of processes of extractive metallurgy), agriculture industry (solubility increase of fertilizers), and pharmaceutical industry (improvement of solubility and bioavailability of drugs). This reference serves as an introduction to newcomers to mechanochemistry, and encourages more experienced researchers to broaden their knowledge and discover novel applications in the field.
Download or read book Minerals as Advanced Materials II written by S V Krivovichev and published by Springer Science & Business Media. This book was released on 2011-12-01 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers that are devoted to various aspects of interactions between mineralogy and material sciences. It will include reviews, perspective papers and original research papers on mineral nanostructures, biomineralization, micro- and nanoporous mineral phases as functional materials, physical and optical properties of minerals, etc. Many important materials that dominate modern technological development were known to mineralogists for hundreds of years, though their properties were not fully recognized. Mineralogy, on the other hand, needs new impacts for the further development in the line of modern scientific achievements such as bio- and nanotechnologies as well as by the understanding of a deep role that information plays in the formation of natural structures and definition of natural processes. It is the idea of this series of books to provide an arena for interdisciplinary discussion on minerals as advanced materials.
Download or read book One Hundred Years at the Intersection of Chemistry and Physics written by Jeremiah James and published by Walter de Gruyter. This book was released on 2011-10-27 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume, occasioned by the centenary of the Fritz Haber Institute, formerly the Institute for Physical Chemistry and Electrochemistry, covers the institute's scientific and institutional history from its founding until the present. The institute was among the earliest established by the Kaiser Wilhelm Society, and its inauguration was one of the first steps in the development of Berlin-Dahlem into a center for scientific research. Its establishment was made possible by an endowment from Leopold Koppel, granted on the condition that Fritz Haber, well-known for his discovery of a method to synthesize ammonia from its elements, be made its director. The history of the institute has largely paralleled that of 20th-century Germany. It undertook controversial weapons research during World War I, followed by a "Golden Era" during the 1920s, in spite of financial hardships. Under the National Socialists it experienced a purge of its scientific staff and a diversion of its research into the service of the new regime, accompanied by a breakdown in its international relations. In the immediate aftermath of World War II it suffered crippling material losses, from which it recovered slowly in the post-war era. In 1953, shortly after taking the name of its founding director, the institute joined the fledgling Max Planck Society. During the 1950s and 60s, the institute supported diverse researches into the structure of matter and electron microscopy in a territorially insular and politically precarious West-Berlin. In subsequent decades, as both Berlin and the Max Planck Society underwent significant changes, the institute reorganized around a board of coequal scientific directors and a renewed focus on the investigation of elementary processes on surfaces and interfaces, topics of research that had been central to the work of Fritz Haber and the first "Golden Era" of the institute.
Download or read book Glass Chemistry written by Werner Vogel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass Chemistry is concerned with the relation of chemical composition, structure and properties of various glasses. The book has been translated from the third German edition, which serves as a textbook for university students in materials sciences and a reference book for scientists and engineers in glass science and production. The central themes of the book are the chemistry and physics of glass. Detailed knowledge of the compositional and structural facts is the basis for the systematic development of new glasses as construction and optical materials. Glass Chemistry is an interdisciplinary book on the borderlines between chemistry, physics, mineralogy and even biology and medicine. The book represents a well balanced treatment for students, scientists and engineers.
Download or read book Chemical Metallurgy written by Chiranjib Kumar Gupta and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 831 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical metallurgy is a well founded and fascinating branch of the wide field of metallurgy. This book provides detailed information on both the first steps of separation of desirable minerals and the subsequent mineral processing operations. The complex chemical processes of extracting various elements through hydrometallurgical, pyrometallurgical or electrometallurgical operations are explained. In the choice of material for this work, the author made good use of the synergy of scientific principles and industrial practices, offering the much needed and hitherto unavailable combination of detailed treatises on both compiled in one book.
Download or read book Mathematical Simulation in Glass Technology written by Dieter Krause and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book on mathematical simulation on glass technology, and covers all production steps of special glass manufacturing. The enclosed CD-ROM shows 27 simulations of different aspects, such as surprising details of the pressing and casting process.
Download or read book Petrogenesis of Metamorphic Rocks written by Kurt Bucher and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metamorphic rocks are one of the three classes of rocks. Seen on a global scale they constitute the dominant material of the Earth. The understanding of the petrogenesis and significance of metamorphic of geological education. rocks is, therefore, a fundamental topic There are, of course, many different possible ways to lecture on this theme. This book addresses rock metamorphism from a relatively pragmatic view point. It has been written for the senior undergrad uate or graduate student who needs practical knowledge of how to interpret various groups of minerals found in metamorphic rocks. The book is also of interest for the non-specialist and non-petrolo gist professional who is interested in learning more about the geolo gical messages that metamorphic mineral assemblages are sending, as well as pressure and temperature conditions of formation. The book is organized into two parts. The first part introduces the different types of metamorphism, defines some names, terms and graphs used to describe metamorphic rocks, and discusses principal aspects of metamorphic processes. Part I introduces the causes of metamorphism on various scales in time and space, and some principles of chemical reactions in rocks that accompany metamorphism, but without treating these principles in detail, and presenting the thermodynamic basis for quantitative analysis of reactions and their equilibria in metamorphism. Part I also presents concepts of metamorphic grade or intensity of metamorphism, such as the metamorphic-facies concept.
Download or read book Metallopolymer Nanocomposites written by A.D. Pomogailo and published by Springer Science & Business Media. This book was released on 2006-01-27 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents and analyzes the essential data on nanoscale metal clusters dispersed in, or chemically bonded with polymers. Special attention is paid to the in situ synthesis of the nanocomposites, their chemical interactions, and the size and distribution of the particles in the polymer matrix. Numerous novel nanocomposites are described with regard to their mechanical, electrophysical, optical, magnetic, catalytic and biological properties. Their applications, present and future, are outlined.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
