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Keywords:

  • lead oxide salts;
  • phase transition;
  • Raman spectroscopy;
  • polarized microscopy;
  • thermal measurements

Abstract

Raman spectroscopy, polarized microscopy and thermal measurements were used to investigate the sequence of phase transition in the lead oxide salts Pb8O5(XO4)2 (where X = As and V). For Pb8O5(AsO4)2, a second-order phase transition is observed at 500 K. For Pb8O5(VO4)2, a second-order and a first-order structural phase transitions are observed at 425 and 525 K, respectively. The ferroelastic character of Pb8O5(VO4)2 is also discussed. Copyright © 2011 John Wiley & Sons, Ltd.