| Summary: | The present investigation aims to study the high-pressure dependence up to 65.2GPa of the bulk modulus, Vickers hardness, mass density, Grüneisen parameter, Debye temperature, and average acoustic velocity for calcium oxide (CaO) binary compound. First, we calculated the normal conditions of Vickers hardness, which is equal to 14.8GPa, and then we employed the high-pressure Mukhanov's et al (2009) model to determine the high-pressure effect on the Vickers hardness. Using this model, commonly the hardness increases with increased pressure. Our data show that the bulk modulus, the mass density, the Debye temperature, and the average acoustic wave speed of CaO material increase gradually with increasing pressure, while both the first order pressure derivative of the bulk modulus and the Grüneisen parameter decrease with enhanced pressure up to 65.2GPa. Furthermore, we determined the normal conditions fracture toughness of CaO material; it is around 1.46MPa.m1/2, which is slightly higher than those of Si and GaP semiconducting materials.
|
|---|