Pressure-induced Phase Transitions in Defect Pyrochlores

Authors

  • Cláudio A. Perottoni Instituto de Materiais Cerâmicos- IMC-UCS
  • João J. A. H. da Jornada Inmetro e Instituto de Física, Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.18226/23185279.v1iss1p24

Abstract

In this paper the influence of pressure and temperature on four compounds with defect pyrochlore structure (NH4NbWO6, RbNbWO6, CsNbWO6, and p-WO3) is explored by means of X-ray diffraction, vibrational (Raman and infrared absorption) spectroscopy and computer simulations. Several structural transitions were observed, including an unusual insertion reaction with volume increase at high pressures. This latter transition is further explored to reveal the influence on the transition pressure of the nature and ionic radius of the cation residing inside the cages formed by the pyrochlore framework.

 

http://dx.doi.org/10.18226/23185279.v1iss1p24

Published

2013-07-30

How to Cite

Perottoni, C. A., & da Jornada, J. J. A. H. (2013). Pressure-induced Phase Transitions in Defect Pyrochlores. Scientia Cum Industria, 1(1), 24–49. https://doi.org/10.18226/23185279.v1iss1p24

Issue

Section

Review Articles In Science, Education and Engineering