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Journal Article

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

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Sharma,  Sangeeta
Theory, Fritz Haber Institute, Max Planck Society;

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PRB-75-224114-2007.pdf
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Citation

Goncharov, A. F., Crowhurst, J. C., Dewhurst, J. K., Sharma, S., Sanloup, C., Gregoryanz, E., et al. (2007). Thermal equation of state of cubic boron nitride: Implications for a high-temperature pressure scale. Physical Review B, 75(22): 224114. doi:10.1103/PhysRevB.75.224114.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-007B-6
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.