Thermodynamics and crystallography of hard light-element boron-rich compounds by in situ X-ray diffraction under high-pressure, high-temperature conditions

Abstract

Here we review the available experimental and theoretical data on phase transformations and thermodynamical properties of boron compounds that can be obtained by in situ methods at high-pressure and high-temperature (HPHT) conditions. The thermodynamic analysis allowed to establish the optimized sets of thermodynamic values and mechanical properties for boron allotropes and compounds such as boron suboxide B₆O, boron subnitride B₁₃N₂, and boron carbide.