Evolution of pressure-amorphized zirconium tungstate upon annealing

  • Ravindran T
  • Arora A
  • Sastry V
 et al. 
  • 4

    Readers

    Mendeley users who have this article in their library.
  • 8

    Citations

    Citations of this article.

Abstract

Zirconium tungstate Zr(WO4)2exhibits irreversible amorphization at high pressure. Upon heating, the pressure-amorphized phase transforms into different phase/phases depending on the pressure applied during heating. Transformation of pressure-amorphized samples to metastable cubic phase during isochronal annealing at ambient pressure is investigated using X-ray diffraction and Raman spectroscopy. Though the X-ray diffraction and Raman spectra show only monotonic changes up to 850 K in the amorphous state, the sample exhibits dramatic changes in the color from gray to black to white. The relaxation of the amorphous phase during annealing suggests gradual irreversible volume increase by about 6%, whereas the tungstate tetrahedra are found to shrink. Crystallization to cubic phase at 900 K is accompanied by a large increase in the sample volume. The specific volumes of the amorphous phases obtained from cycling the samples to different pressures suggest the possibility of polyamorphism in this system. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Ceramics
  • Optical spectroscopy
  • Phonons
  • Raman scattering
  • Raman spectroscopy
  • Short-range order
  • Structure
  • X-ray diffraction

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • T. R. Ravindran

  • A. K. Arora

  • V. S. Sastry

  • P. Ch Sahu

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free