Equation of state of cubic boron nitride at high pressures and temperatures

Details Equation of state of cubic boron nitride at high pressures and temperatures Equation of state of cubic boron nitride at high pressures and temperatures

2007-02-27

arxiv.org/abs/cond-mat/0702656v1

Physical Review B 75 (06/06/2007) 214104

Physics

Condensed Matter

Other Condensed Matter

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.75.214104

We report accurate measurements of the equation of state (EOS) of cubic boron nitride by x-ray diffraction up to 160 GPa at 295 K and 80 GPa in the range 500-900 K. Experiments were performed on single-crystals embedded in a quasi-hydrostatic pressure medium (helium or neon). Comparison between the present EOS data at 295 K and literature allows us to critically review the recent calibrations of the ruby standard. The full P-V-T data set can be represented by a Mie-Gr\"{u}neisen model, which enables us to extract all relevant thermodynamic parameters: bulk modulus and its first pressure-derivative, thermal expansion coefficient, thermal Gr\"{u}neisen parameter and its volume dependence. This equation of state is used to determine the isothermal Gr\"{u}neisen mode parameter of the Raman TO band. A new formulation of the pressure scale based on this Raman mode, using physically-constrained parameters, is deduced.

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