Thermoelastic equation of state of boron subphosphide B12P2

TL;DR

This study investigates the compressibility, thermal expansion, and thermoelastic properties of boron subphosphide B12P2 under high pressure and temperature conditions, providing experimental data and modeling insights.

Contribution

It presents the first comprehensive experimental analysis of B12P2's thermoelastic behavior up to 26 GPa and 2600 K, including bulk modulus and thermal expansion data.

Findings

Bulk modulus B0 = 192 GPa at ambient conditions

Thermal expansion coefficient α = 17.4×10^-6 K^-1 up to 1300 K

Data well described by Anderson-Grüneisen model

Abstract

Compressibility of boron subphosphide B12P2 has been studied under quasi-hydrostatic conditions up to 26 GPa and 2600 K using laser-heated diamond anvil cell and angle-dispersive synchrotron X-ray diffraction. 300-K data fit yields the values of bulk modulus B0 = 192(11) GPa and its first pressure derivative B0' = 5.5(12). At ambient pressure the thermal expansion is quasi-linear up to 1300 K with average volume expansion coefficient {\alpha} = 17.4(1) 10-6 K-1. The whole set of experimental p-V-T data is well described by the Anderson-Gr\"uneisen model with {\delta}T = 6.