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Synthesis and properties of metastable phases

Synthesis and properties of metastable phases

proceedings of a symposium

by

  • 324 Want to read
  • 29 Currently reading

Published by The Society in Warrendale, Pa .
Written in English

    Subjects:
  • Physical metallurgy -- Congresses.,
  • Phase rule and equilibrium -- Congresses.

  • Edition Notes

    Includes bibliographical references and indexes.

    Statementsponsored by the TMS-AIME Alloy Phases Committee at the fall meeting of the Metallurgical Society of AIME, Pittsburgh, Pennsylvania, October 5-9, 1980 ; edited By E.S. Machlin and T.J. Rowland.
    SeriesConference proceedings / the Metallurgical Society of AIME, Conference proceedings (Metallurgical Society of AIME)
    ContributionsMachlin, E. S., Rowland, T. J. 1927-, Metallurgical Society of AIME. Alloy Phases Committee., Metallurgical Society of AIME.
    Classifications
    LC ClassificationsTN689.2 .S99
    The Physical Object
    Paginationv, 197 p. :
    Number of Pages197
    ID Numbers
    Open LibraryOL4126794M
    ISBN 100895203723
    LC Control Number80085205

    Invited Book Chapter, Chapter 16 of "Nanostructured semiconductors: amorphisation and thermal properties", edited by Konstantinos Termentzidis The book is devoted to nanostructures and nanostructured materials containing both amorphous and crystalline phases with a particular focus on their thermal properties.


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Synthesis and properties of metastable phases Download PDF EPUB FB2

Jaap van Brakel, in Philosophy of Chemistry, 11 Metastable and Other Esoteric Phases. Metastable phases are found in nature and are produced by traditional and novel material processing techniques.

For example, a metallic glass golf club head with a strength and hardness twice that of cast stainless steel or titanium but of lower modulus and intermediate density, made by bulk. Get this from a library. Synthesis and properties of metastable phases: proceedings of a symposium. [E S Machlin; T J Rowland; Metallurgical Society of AIME.

Alloy. Chimie douce synthesis forms metastable phases. These phases have by definition a higher free energy than the corresponding stable phase for the same chemical composition.

It is tempting to question why such phases occur at all and why the thermodynamically most stable phase is. Synopsis. We used liquid-feed flame spray pyrolysis to produce nanopowders along the Al 2 O 3 −MgAl 2 O 4 tie-line. Complementary X-ray diffraction and Fourier transform infrared studies reveal an evolution of metastable phase structure from δ-Al 2 O 3 to MgAl 2 O study provides insight into the structure of transition aluminas and establishes a route to novel catalysts and supports.

Request PDF | On Nov 1,Ahmed A. Al-Joubori and others published Synthesis of stable and metastable phases in the NiSi system by mechanical alloying | Find, read and cite all the research. The reaction kinetics involved in polyol process has enabled us to synthesis and investigate the magnetic properties of metastable bcc phase in the Fe64Ni36 composition.

Discover the world's. The metastability of Cu4O3 has long hindered the synthetic preparation of bulk samples with substantial crystallinity.

The lack of suitable samples has thwarted the detailed understanding of the magnetic properties of Cu4O3 and the ability to tune its properties. While Cu4O3 was recently shown to form in solvothermal reactions, the results are unpredictable, and the crystals are by: Metastable phases are common in condensed matter and crystallography.

Notably, this is the case for anatase, a metastable polymorph of titanium dioxide, which despite commonly being the first phase to form in many synthesis processes due to its lower surface energy, is always metastable, with rutile being the most stable phase at all.

Ultrananocrystalline Diamond: Synthesis, Properties, and Applications is a unique practical reference handbook. Written by the leading experts worldwide it introduces the science of UNCD for both the R&D community and applications developers using UNCD in a diverse range of applications from macro to nanodevices, such as energy-saving ultra-low friction and wear coatings for mechanical Pages: Volume is indexed by Thomson Reuters CPCI-S (WoS).There is a growing interest in the field of Mechanically Alloyed, Metastable and Nanocrystalline Materials, especially with regard to linking basic research efforts to technological requirements of industrial applications.A major objective of the present book was to ensure that the various disciplines involved in the study, development and.

@article{osti_, title = {Anisotropic Hexagonal Boron Nitride Nanomaterials - Synthesis and Applications}, author = {Han, W Q}, abstractNote = {Boron nitride (BN) is a synthetic binary compound located between III and V group elements in the Periodic Table.

However, its properties, in terms of polymorphism and mechanical characteristics, are rather close to those of carbon compared with. @article{osti_, title = {In-situ composite formation iron metastable precursor phases in the Nb-Cr-Ti system}, author = {Thoma, D J and Perepezko, J H}, abstractNote = {Metastable bcc solid solutions have been produced through rapid solidification processing in the Nb-Cr-Ti system.

The microstructures resulting from the metastable precursor phase decomposition are dual-phase with isolated. Perovskite iridates have emerged as a new paradigm for studying the strongly correlated electron physics with strong spin-orbit coupling.

The “” alkaline-earth iridates AIrO3 (A = Ca, Sr, Ba) display a rich variety of crystallographic and electronic states and are now attracting growing research interest. This chapter aims to provide an overview for these “” iridates, including Cited by: 1.

All examples known so far of inorganic metastable high-pressure phases existing at room pressure for a long time correspond to case b in Fig. 1A, that is, none of the known metastable phases Cited by: 1*2/Introduction to Alloy Phase Diagrams magnesium, and manganese. These substances constitute the components comprising the system and should not be confused with the various phases found within the system.

A system, how- ever, also can consist of a single component, such as an element or compound. Phase Diagrams.

Recent experimental and theoretical work has demonstrated significant potential to tune the properties of silicon and germanium by adjusting the mesostructure, nanostructure, and/or crystalline structure of these group 14 elements.

Despite the promise to achieve enhanced functionality with these already technologically important elements, a significant challenge lies in the identification of Cited by: 2.

Synthesis of metastable chromium carbide nanomaterials and their electrocatalytic activity for the hydrogen evolution reaction† Samantha M. Schmuecker, a Dale Clouser, a Theodore J. Kraus a and Brian M. Leonard * a. By using non-reactive sputter deposition at low temperatures metastable solid solution phases in the Ti–Ni–C system were synthesized.

Produced thin films were either single phase carbides or nanocomposite of nanocrystalline carbide and amorphous the Ni-containing samples a supersaturated solid solution phase (Ti 1−x Ni x)C y was identified, and was present either as single.

Synthesis and Characterization of Hexagonal Shaped Nanocrystalline Zinc Oxide Powders: /ch Nanocrystalline ZnO powders are synthesized using a quick, simple and inexpensive combustion method. Glycine and zinc nitrate, used as fuel and oxidant/cationCited by: 2.

Nanostructures and Nanomaterials: Synthesis, Properties & Applications Guozhong Cao This important book focuses on the synthesis and fabrication of nanostructures and nanomaterials, but also includes properties and applications of nanostructures and nanomaterials, particularly inorganic nanomaterials.

At this time, three stable superconducting BSCCO phases are known: Bi 2 Sr 2 CuO x (), Bi 2 Sr 2 CaCu 2 O x (),and Bi 2 Sr 2 Ca 2 Cu 3 O x (). The critical temperature of the superconductive transition T c rises when the number of Ca-Cu-O planes n is increased.

Its value is 10 K, 95 K,and K for, and phases Cited by: 1. A textbook for upper-level undergraduate, graduate, and professional short courses introducing nanotechnology. It discusses such aspects as the physical chemistry of solid surfaces; nanostructures with dimensions of zero (particles), one (wires and rods), and two (films); special nanomaterials; characterization and properties; and applications.

Nanostructuring and nanosizing have been widely employed to increase the rate capability in a variety of energy storage materials. While nanoprocessing is required for many materials, we show here that both the capacity and rate performance of low-temperature bronze-phase TT- and T-polymorphs of Nb2O5 are inherent properties of the bulk crystal by: In the present work, we systematically studied the transformation of perovskite phases and their magnetic properties in the whole BiFe 1-y Sc y O 3 series.

For the compositions with y ≥the perovskite phases can only be stabilized under high-pressure conditions and the metastable phases were subject to post-synthesis thermal treatment. Mixtures of Ni at.% Ti and Ti at.% Fe powders are studied after treating in a ball planetary mill 30, 60, and min under conditions of mechanochemical synthesis (MCS) with the use of methods of x-ray and metallographic analysis.

The mechanisms of formation of metastable phases are by: Book Chapter “Metastable phase selection and low temperature plasticity in chemically synthesized amorphous Al 2 O 3-ZrO 2 and Al 2 O 3-Y 2 O 3 ”, Ashutosh S. Gandhi, Arindam Paul, Shailendra Singh Shekhawat, Umesh Waghmare, and Vikram Jayaram, in 'Oxide Nanostructures: Growth, Microstructures, and Properties ', Ed.

A.K. Srivastava, Pan Stanford Publishing (April ). This review critically summarizes currently known results concerning the thermal decomposition of the most frequently used ferrate(VI) salts (K 2 FeO 4, BaFeO 4, Cs 2 FeO 4).Parameters important in the thermal decomposition of solid ferrates(VI) include the initial purity of the sample, a presence of adsorbed and/or crystal water, reaction atmosphere and temperature, crystal linity, phase Cited by: 3.

Therefore, it is possible to synthesize carbonates of various rare-earths in this way, with a simple and cheap process in an aqueous environment. It is probable that these are metastable phases, but that their transformation kinetics are extremely slow because of the chemical properties induced by Cited by: 2.

In contrast to thermodynamically stable phases, nanocrystalline metastable c-TiAlN is formed by kinetically limited growth from the vapor phase at cooling rates of up to 10 15 K s −1 (ref. 21).Cited by: 8.

purely quasicrystalline structure; various crystalline phases are usually present. Also, most quasicrystals have been prepared as metastable phases by rapid solidification techniques such as melt-spinning, laser surface melting and low-temperature annealing from an amorphous phase (17).Cited by: 2.

XVII International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM ) XVII International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM ) One-pot facile synthesis and optical properties of porous La2O2CO3 hollow microspheres.

Niu, H. / Min, Q. / Tao. We are exploring the ALD growth of many metastable oxide and nitride phases using low- and mid-valent precursors.

This work also entails the synthesis and characterization of new low- and mid-valent complexes that have acceptable precursor properties. Target materials include metastable oxide and nitride phases of the group metals. Emission properties of ZnO nanoparticles are influenced by many factors such as synthesis method, morphology of the nanoparticles, dopants and ligands used for surface coating [8,10,–].

Zinc-based phosphors have been known for decades, although the precise mechanism of their operation is still said to be controversial [,]. This basically explains why all metastable high-pressure phases transform to more stable phases upon heating at far lower temperatures than the melting temperature of the stable phase (T m).

The advancement of high-pressure technology has not been as widespread as other synthesis techniques such as high temperature and catalysis [ 2 ].Author: Wallace Matizamhuka.

The 13th International Conference on Rapidly Quenched and Metastable Materials --Development of the Ni-based Metallic glassy bipolar plates for Proton Exchange Membrane Fuel Cell (PEMFC) --Rapidly quenched Pd₄--Ni₄--Si₆ based alloy for application as a brazing material --Kinetic study of embrittlement of Ti- and Zr-based metallic glasses.

The term synthesis, as used in this appendix, refers to that part of synthesis and processing in which attention is focused primarily on the chemical and physical means by which atoms and molecules are combined to produce materials.

In this view of synthesis, both the scientific problems of finding new routes to synthesis and the technological problems of finding ways to synthesize materials.

Synthesis, Properties and Mineralogy of Important Inorganic Materials Synthesis, Properties and Mineralogy of Important Inorganic Materials By Terence E. Warne Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

4) Journal link Low-Temperature Solvothermal Route to Gallium Nitride Nanoparticles, Jianjun Wang, Luke Grocholl, and Edward G. Gillan, In Synthesis, Functional Properties, and Applications of Nanostructures, Mater.

Res. Rational synthesis of inorganic and hybrid nanoparticles and nanocomposites and the study of their structural-functional properties. Among others, we are currently interested in the stabilization of metastable phases, the preparation of core-shell nanoparticles, nanocomposites and biocompatible porous scaffolds.

Carbon Vacancy Ordered Non-Stoichiometric ZrC Synthesis, Characterization and Oxidation at Low Temperature: /ch The starting nanopowders of non-stoichiometric zirconium carbide (ZrCx) were fabricated via milling Zr powders in toluene for different dwell times.

TheCited by: 1. synthesis of unexpected (and recoverable) boron-rich high-pressure phases [34, 35]. Untilamong 16 allotropes of boron mentioned in the literature, only three phases seemed to correspond to the pure element, namely, α-B 12 rhombohedral low-temperature, β-B rhombohedralAuthor: Yann Le Godec, Alexandre Courac, Vladimir L.

Solozhenko.12 Calcium Sulfate Precipitation Throughout Its Phase Diagram Fig. Structural motifs of the three main calcium sulfate phases, gypsum, bassanite, and anhydrite (AII form). Tetrahedra are sulfate ions, large spheres are Ca ions, and arrows indicate water sheets and channels in the gypsum and bassanite structures, respectively (Images File Size: KB.Synthesis of calcium aluminate nanoparticles: CA was synthesized based on the procedure reported by Gaki et al.

[].An aqueous solution was prepared containing Ca(NO 3) H 2 O and Al(NO 3) H 2 O with Ca:Al molar ratio of in ml distilled water. Citric acid (Cit) was added to the solution (molar ratio of Cit:total cations was one).