Determination of the Thermal Expansion Coefficient of Boron Carbide В13С2

Abstract

X-ray diffraction studies of boron carbide В₁₃С₂ crystals were performed within a temperature range of 25–700°C. The thermal expansion coefficeint of boron carbide В₁₃С₂ crystals was determined. The temperature dependence of the thermal expansion coefficient was established to have a kink in the temperature region of 420–465°C. The change of thermal expansion anisotropy was revealed. The results of X-ray diffraction indirectly confirm the literature data on the existence of a phase transition in boron carbide in the region of 439–444°C.