Thermal equation of state of cubic boron nitride: Implications for a high-temperature pressure scale

Alexander F. Goncharov, Jonathan C. Crowhurst, John K. Dewhurst, Sangeeta Sharma, Chrystele Sanloup, Eugene Gregoryanz, Nicolas Guignot, Mohamed Mezouar

Research output: Contribution to journalArticlepeer-review

Abstract

The equation of state of cubic boron nitride (cBN) has been determined to a maximum temperature of 3300 K at a simultaneous static pressure of up to more than 70 GPa. Ab initio calculations to 80 GPa and 2000 K have also been performed. Our experimental data can be reconciled with theoretical results and with the known thermal expansion at 1 bar if we assume a small increase in pressure during heating relative to that measured at ambient temperature. The present data combined with the Raman measurements we presented earlier form the basis of a high-temperature pressure scale that is good to at least 3300 K.

Original languageEnglish
Article number224114
Number of pages6
JournalPhysical review B: Condensed matter and materials physics
Volume75
Issue number22
DOIs
Publication statusPublished - Jun 2007

Keywords

  • DIAMOND-ANVIL CELL
  • V-T EQUATION
  • EARTHS MANTLE
  • GOLD
  • CALIBRATION
  • EXPANSION
  • TRANSFORMATION
  • PEROVSKITE
  • PLATINUM
  • BOUNDARY

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