Download or read book Kinetics of Silica phase Transitions written by Christopher J. Duffy and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetics of Silica phase Transitions written by and published by . This book was released on 1993 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition to the stable silica polymorph quartz, several metastable silica phases are present in Yucca Mountain. The conversion of these phases to quartz is accompanied by volume reduction and a decrease in the aqueous silica activity, which may destabilize clinoptilolite and mordenite. The primary reaction sequence for the silica phases is from opal or glass to disordered opal-CT, followed by ordering of the opal-CT and finally by the crystallization of quartz. The ordering of opal-CT takes place in the solid state, whereas the conversion of opal-CT takes place through dissolution-reprecipitation involving the aqueous phase. It is proposed that the rate of conversion of opal-CT to quartz is controlled by diffusion of defects out of a disordered surface layer formed on the crystallizing quartz. The reaction rates are observed to be dependent on temperature, pressure, degree of supersaturation, and pH. Rate equations selected from the literature appear to be consistent with observations at Yucca Mountain.
Download or read book Kinetics of Phase Transitions written by Sanjay Puri and published by CRC Press. This book was released on 2009-03-24 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive introduction with the necessary background material to make it accessible for a wide scientific audience, Kinetics of Phase Transitions discusses developments in domain-growth kinetics. This book combines pedagogical chapters from leading experts in this area and focuses on incorporating various experimentally releva
Download or read book Kinetic Processes written by Kenneth A. Jackson and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of solids is governed by kinetic processes, which are closely related to the macroscopic behaviour of the resulting materials. With the main focus on ease of understanding, the author begins with the basic processes at the atomic level to illustrate their connections to material properties. Diffusion processes during crystal growth and phase transformations are examined in detail. Since the underlying mathematics are very complex, approximation methods typically used in practice are the prime choice of approach. Apart from metals and alloys, the book places special emphasis on the growth of thin films and bulk crystals, which are the two main pillars of modern device and semiconductor technology. All the presented phenomena are tied back to the basic thermodynamic properties of the materials and to the underlying physical processes for clarity.
Download or read book Kinetics of First Order Phase Transitions written by Vitaly V. Slezov and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling a gap in the literature, this crucial publication on the renowned Lifshitz-Slezov-Wagner Theory of first-order phase transitions is authored by one of the scientists who gave it its name. Prof Slezov spent decades analyzing this topic and obtained a number of results that form the cornerstone of this rapidly developing branch of science. Following an analysis of unresolved problems together with proposed solutions, the book develops a theoretical description of the overall course of first-order phase transformations, starting from the nucleation state right up to the late stages of coarsening. In so doing, the author illustrates the results by way of numerical computations and experimental applications. The outline of the general results is performed for segregation processes in solutions and the results used in the analysis of a variety of different topics, such as phase formation in multi-component solutions, boiling in one- and multi-component liquids, vacancy cluster evolution in solids with and without influence of radiation, as well as phase separation in helium at low temperatures. The result is a detailed overview of the theoretical description of the whole course of nucleation-growth processes and applications for a wide audience of scientists and students.
Download or read book Kinetic Phase Diagrams written by Zdeněk Chvoj and published by Elsevier Publishing Company. This book was released on 1991 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present theoretical and experimental knowledge of the time evolution of a system during solidification, not only in equilibrium, but also in nonequilibrium conditions, is summarized in this book. Such knowledge is of fundamental importance for the determination of the constitution of materials or of the technological conditions necessary to prepare materials with a desired structure. Emphasizing the importance of kinetic phase diagrams, the authors focus the attention of the reader on the problems connected with nonequilibrium conditions, that are encountered during real phase transformations. A critical review of phenomenological and statistical theories of phase transformations and of mass and heat transport enables the reader to determine the range of applicability of concrete models for the description of the evolution of a given system. The book is supplemented with several less-known methods and results of phase characterization, including a detailed account of the Soviet school of T.A. Cherepanova which is not well known in the West. The text also covers the modern research area of glasses and their preparation.
Download or read book Kinetics of Phase Transitions written by John Kevin McCoy and published by . This book was released on 1980 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Transitions in Solids Under High Pressure written by Vladimir Davydovich Blank and published by CRC Press. This book was released on 2013-10-25 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of high-pressure techniques has become popular for studying the nature of substances and phenomena occurring in them, especially as a means of obtaining new materials (synthesis under high pressure) and processing known materials (hydroextrusion). A product of many years of research by the authors and their colleagues, Phase Transitions in Solids under High Pressure discusses the relationships of phase transformations in solids under high pressure, the mechanism of these transformations, crystal geometry, the effect of deformation, the conditions of formation, and preservation of the high-pressure phases under normal pressure. The book begins with an introduction that describes the relationship of the thermodynamics of phase transformations and the kinetics of the transformations. This is followed by a chapter explaining the equipment and mostly original procedures for investigating phase transformation in solids under high hydrostatic and quasi-hydrostatic pressures. The book covers phase transformations under high pressure in a wide temperature range in the elements carbon, silicon, germanium, titanium, zirconium, iron, gallium, and cerium as well as in titanium- and iron-based alloys and AIBVII, AIIBVI, and AIIIBV compounds. In addition, the book examines the kinetics of phase transformations in iron-based alloys in isobaric–isothermal conditions. The authors present results for phase transformations in deformation under high pressure, describe several non-trivial effects associated with phase transformations under high pressure, and analyze the kinetics and hysteresis of high-temperature and low-temperature phase transformations. They conclude by describing the role of investigations under high pressure for determining general relationships governing phase transformations in solids.
Download or read book The Kinetics of Silica water Reactions written by James Donald Rimstidt and published by . This book was released on 1981 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Transformation Kinetics in Thin Films Volume 230 written by M. Chen and published by . This book was released on 1992-02-28 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Kinetics of Silica Condensation In Brines written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Homogeneous nucleation and growth of silica from brines supersaturated in silicic acid has been studied over a range of pH (4.5-6.7), temperature (75-105 C), salinity, and silicic acid concentration (700 to 1200 ppm as SiO2). The experimental technique involved analyses for molybdate-reactive silicic acid as a function of time after a supersaturated solution of H4SiO4 was prepared by mixing aliquots of a stock silicate solution with buffered brine. The isothermal rate of SiO2 condensation is a strong function of supersaturation (C/C{sub eq}), pH, and salinity. The overall kinetics follow what is expected from the general theory of phase transitions and are adequately described by the Volmer-Becker-Doring expressions for condensation from solution. At supersaturations less than about 3, an induction or transition time is observed. It amounts to several hundred minutes at supersaturations of about 2.0.
Download or read book Phase Transitions 1973 written by H. K. Henisch and published by Elsevier. This book was released on 2013-10-22 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase Transitions - 1973 is a collection of the proceedings of the Conference on Phase Transitions and Their Applications in Materials Science, held at Pennsylvania State University, Pennsylvania, on May 23-25, 1973. The papers explore some of the practical applications of solid-state phase transitions and consequent precursor property modifications in metals, ceramics, glasses, polymers, macromolecules, and biological systems. Comprised of 41 chapters, this book begins with an introduction to applications of phase transitions in materials science, followed by a syncretist classification of phase transitions. Subsequent chapters discuss phase transitions in materials such as liquid crystals, PLZT ceramics, disordered semiconductors, silver iodide single crystals, and aluminum alloys. The structural aspects of phase transitions are also considered, along with the statistical mechanics of glass transition; thermal expansion and phase transitions in silica; phase transformation of Fe-Mn alloys induced by shock loading; and order-disorder transitions in biopolymers. This monograph will be of interest to physicists and materials scientists.
Download or read book Kinetics of Phase Transformations Volume 205 written by Michael O. Thompson and published by . This book was released on 1992-02-28 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Kinetics and Thermodynamics of Multistep Nucleation and Self Assembly in Nanoscale Materials Volume 151 written by Gregoire Nicolis and published by John Wiley & Sons. This book was released on 2012-05-22 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advances in Chemical Physics series—the cutting edge of research in chemical physics The Advances in Chemical Physics series provides the chemical physics and physical chemistry fields with a forum for critical, authoritative evaluations of advances in every area of the discipline. Filled with cutting-edge research reported in a cohesive manner not found elsewhere in the literature, each volume of the Advances in Chemical Physics series presents contributions from internationally renowned chemists and serves as the perfect supplement to any advanced graduate class devoted to the study of chemical physics. This volume explores: Kinetics and thermodynamics of fluctuation-induced transitions in multistable systems (G. Nicolis and C. Nicolis) Dynamical rare event simulation techniques for equilibrium and nonequilibrium systems (Titus S. van Erp) Confocal depolarized dynamic light scattering (M. Potenza, T. Sanvito, V. Degiorgio, and M. Giglio) The two-step mechanism and the solution-crystal spinodal for nucleation of crystals in solution (Peter G. Vekilov) Experimental studies of two-step nucleation during two-dimensional crystallization of colloidal particles with short-range attraction (John R. Savage, Liquan Pei, and Anthony D. Dinsmore) On the role of metastable intermediate states in the homogeneous nucleation of solids from solution (James F. Lutsko) Effects of protein size on the high-concentration/low-concentration phase transition (Patrick Grosfils) Geometric constraints in the self-assembly of mineral dendrites and platelets (John J. Kozak) What can mesoscopic level in situ observations teach us about kinetics and thermodynamics of protein crystallization? (Mike Sleutel, Dominique Maes, and Alexander Van Driessche) The ability of silica to induce biomimetic crystallization of calcium carbonate (Matthias Kellermeier, Emilio Melero-GarcÍa, Werner Kunz, and Juan Manuel GarcÍa-Ruiz)
Download or read book The Effect of High Pressure on Crystallization Kinetics Fused Silica written by D. R. Uhlmann and published by . This book was released on 1966 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thermodynamic theory is developed for the effect of pressure on the kinetics of phase transformations. The results suggest that application of pressure may have a profound effect in increasing the rate of crystal nucleation, but that its effect on growth rate should generally be a smaller inhibitory one. Observations on SiO2 carried out in a Bridgman-anvil high pressure device demonstrated the occurrence of crystallization under conditions of temperature and pressure where none had been anticipated from the kinetic formalism. A number of hypotheses are suggested to account for the observations, the most satisfactory of which is based on the effect of water, and the possible existence of a water-rich region at the interface at high pressure, in enhancing the extent of crystallization in a given time. (Author).
Download or read book Kinetic Processes written by Kenneth A. Jackson and published by John Wiley & Sons. This book was released on 2010-08-09 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this completely revised edition, all the chapters have been updated to reflect the current state of crystal growth kinetics. At the same time, fifteen percent additional content now allows coverage of computer-assisted modeling of second-order phase changes, microstructure development, novel data and images of coarsening mechanisms, with the most significant single addition being breakthrough results on spinodal decomposition -- published here for the first time in book form. The refined didactical approach with a streamlined presentation now allows readers to grasp the kinetic concepts even more easily, coherently introducing the field of kinetic processes, especially those involved in crystal growth, and explaining such phenomena as diffusion, nucleation, segregation and phase transitions at a level accessible to graduate students. In addition to the basic kinetic concepts, the textbook presents modern applications where these processes play a major role, including ion implantation, plasma deposition and rapid thermal processing.
Download or read book Advances in Phase Transitions written by J. D. Embury and published by Elsevier. This book was released on 2013-10-22 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a record of the symposium held at McMaster University, Ontario, Canada, in honour of Professor J\S\Kirkaldy, and covers the recent progress being made in phase transformations, both experimental and theoretical, to facilitate the understanding of microstructural development. This volume includes new material on atomic modelling of phase transitions, descriptions of amorphous-crystalline transitions, new data on motion of interfaces, elastic energy effects and pattern forming systems, as well as contributions from related disciplines such as thermodynamics, kinetics and the mechanics of solids.
