Equation of state of single-crystal cubic boron phosphide

TL;DR

This study determines the 300 K equation of state of cubic boron phosphide using high-pressure X-ray diffraction, providing precise measurements of its bulk modulus and pressure derivative up to 55 GPa.

Contribution

The paper presents the first in situ single-crystal X-ray diffraction measurements of cubic boron phosphide's equation of state at high pressure.

Findings

Bulk modulus B0 = 179 GPa with 1 GPa uncertainty

Pressure derivative of bulk modulus = 3.3

Results agree with previous elastic and semiempirical data

Abstract

The 300 K equation of state of cubic (zinc-blende) boron phosphide BP has been studied by in situ single-crystal X-ray diffraction with synchrotron radiation up to 55 GPa. The measurements have been performed under quasi-hydrostatic conditions using a Ne pressure medium in a diamond anvil cell. A fit of the experimental p-V data to the Vinet equation of state yields the bulk modulus B0 of 179(1) GPa with its pressure derivative of 3.3(1). These values are in a good agreement with previous elastic measurements, as well as with semiempirical estimations.