Compression and thermal expansion of hexagonal graphite-like boron nitride up to 7 GPa and 1800 K

Abstract

The lattice parameters of hexagonal graphite-like boron nitride (hBN) have been measured in the temperature range from 300 to 1800 K up to 7 GPa using energy-dispersive powder diffraction of synchrotron radiation. From the obtained p-V-T relation for hBN, the temperature dependence of isothermal bulk modulus ( B 0[ GPa] = 32.06(4) + 4.47(9)·e − (T[K] − 298) 298 ) and pressure dependence of thermal expansion coefficient ( β × 10 6[K −] = 40.9(8) − 1.6(2)· p[GPa]) have been derived.