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Title: Phase Transitions in Materials

  1. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
Resource Type:
Country of Publication:
United States

Citation Formats

CIT). Phase Transitions in Materials. United States: N. p., 2016. Web.
CIT). Phase Transitions in Materials. United States.
CIT). Tue . "Phase Transitions in Materials". United States. doi:.
title = {Phase Transitions in Materials},
author = {CIT)},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 13 00:00:00 EDT 2016},
month = {Tue Sep 13 00:00:00 EDT 2016}

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  • Despite the fact that all chemical bonds expand on heating, a small class of materials shrinks when heated. These, so called negative thermal expansion (NTE) materials, are a unique class of materials with some exotic properties. The present chapter offers insight into the structural aspects of pressure- (or temperature-) induced phase transformations, and the energetics of those changes in these fascinating materials, in particular NTE compound cubic ZrW2O8, orthorhombic Sc2W3O12 and Sc2Mo3O12, as well as other members of the 'scandium tungstate family'. In subsequent sections, (i) combined in situ high-pressure synchrotron XRD and XAS studies of NTE material ZrW2O8; (ii)more » an in situ high-pressure synchrotron XRD study of Sc2W3O12, Sc2Mo3O12, and Al2W3O12; and (iii) thermochemical studies of the above materials are presented and discussed. In all of these studies, chemical bonds change, sometimes break and new ones form. Correlations between structure, chemistry, and energetics are revealed. It is also shown that (iv) NTE materials are good candidates as precursors to make novel solid state materials, such as the conducting Sc0.67WO4, using high-pressure, high-temperature synthesis, through modification of bonding and electronic structure, and thus provide vast opportunities for scientific exploration.« less
  • This multiauthor volume reviews the application of infrared, light scattering, and neutron scattering spectroscopies to the study of phase transitions. Aside from a chapter on phase and conformational transitions in biological systems, the focus is on structural phase transitions in solids and the behavior of soft modes that couple to the relevant order parameters. There are, of course, numerous other books that cover similar material. However, the inclusion of several, different vibrational spectroscopic techniques makes this volume rather unique, and it nicely complements the other existing reviews in this field.
  • The book treats the problem of phase transitions, emphasizing its generality and universality of the methods and models used in it. The course is basically concentrated on the problems of vacuum degeneration in macroscopic systems and a fundamental concept of quasi - averages by Bogolubov playing a special role in the theory of phase transitions and critical phenomena. An analysis of the connection between phase transition and spontaneous symmetry breaking in a macroscopic system allows a unique description of both first - and second - order phase transition.
  • Rotational motion of cyclohexane in the liquid and the solid plastic phase is studied using Raman light scattering. The results are compared with molecular dynamics simulations run for model pores of diameters similar to those used in the experiment. The presence of the surface layer and its effect on the relation times is discussed. The temperature of the solid-solid phase transition is determined from the analysis of the {nu}{sub 21} band shape. It is shown that the depression of` the cubic to monoclinic phase transition depends on the pore diameter and is different for modified and unmodified surfaces. It ismore » suggested that molecules near the pore walls form the amorphous structure and only molecules near the center of the pore form crystallographic structure.« less