Compression and thermal expansion of rhombohedral boron nitride at high pressures and temperatures Original Research Article

The lattice parameters of rhombohedral graphite-like boron nitride (rBN) have been measured in the 298–1073 K temperature range to 6.1 GPa using energy- and angle-dispersive powder diffraction with synchrotron radiation. From the obtained p–V–T data thermoelastic parameters of rBN were derived by fitting a modified high-temperature Birch–Murnaghan equation of state. The results are: bulk modulus its pressure derivative B′=6.2, and volumetric thermal expansion with values of and