Synthesis and crystal chemical characterization of the pyrochlore type MgZrSi2O7

Junshan Xu, Eiji Ito, Daisuke Yamazaki, Xinzhuan Guo, Xiaoping Wu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The pyrochlore type of MgZrSi2O7 was synthesized at 25 GPa and 1500 °C using a Kawai-type, multi-anvil apparatus. Powder X-ray diffraction and Rietveld analysis revealed that the phase assumed the pyrochlore structure (space group Fd3̄m, cubic) with the lattice parameter a = 9.2883(1) and the structural parameter x = 0.4295(4). Chemical analysis by the electron probe microanalysis (EPMA) confirmed the stoichiometry of MgZrSi 2O7. It was demonstrated that the eight-fold coordinated 16c site is randomly occupied by both Mg2+ and Zr4+ ions in a 1:1 ratio. The high ionic radius ratio RA/RB (where A and B denote Mg + Zr and Si, respectively) of 2.22 necessitates a relatively high pressure to stabilize the pyrochlore structure.

Original languageEnglish
Pages (from-to)410-412
Number of pages3
JournalMaterials Chemistry and Physics
Volume128
Issue number3
DOIs
Publication statusPublished - Aug 15 2011

Keywords

  • Chemical synthesis
  • Crystal structure
  • Powder diffraction
  • Rietveld analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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