Thermoelastic properties of the high-pressure phase of SnO2 determined by in situ X-ray observations up to 30 GPa and 1400 K

S. Ono, E. Ito, T. Katsura, Akira Yoneda, M. J. Walter, Satoru Urakawa, W. Utsumi, K. Funakoshi

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Abstract

In situ synchrotron X-ray experiments in the system SnO2 were made at pressures of 4-29 GPa and temperatures of 300-1400 K using sintered diamond anvils in a 6-8 type high-pressure apparatus. Orthorhombic phase (α-PbO2 structure) underwent a transition to a cubic phase (Pα3̄ structure) at 18 GPa. This transition was observed at significantly lower pressures in DAC experiments. We obtained the isothermal bulk modulus of cubic phase K0 = 252(28) GPa and its pressure derivative K′ = 3.5(2.2). The thermal expansion coefficient of cubic phase at 25 GPa up to 1300 K was determined from interpolation of the P-V-T data obtained, and is 1.7(± 0.7) × 10-5 K-1 at 25 GPa.

Original languageEnglish
Pages (from-to)618-622
Number of pages5
JournalPhysics and Chemistry of Minerals
Volume27
Issue number9
DOIs
Publication statusPublished - 2000
Externally publishedYes

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Keywords

  • High pressure
  • Phase transition
  • Tin dioxide

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

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