High Pressure and Temperature Equation of State of NiO up to 8 GPa and 1400K

Jiuhua Chen¹, Annette E. Farah²

¹Mineral Physics Institute, SUNY at Stony Brook

²University of South Florida

Jiuhua.chen@sunysb.edu

NSLS-X17B (MAP)

P-V-T measurements of nickel oxide (NiO) were conducted by using in situ synchrotron x-ray diffraction and a multi-anvil apparatus at National Synchrotron Light Source. Data were collected at pressures and temperatures up to 8 GPa and 1370K. Fitting the experimental data to the third-order Birch-Murnaghan equation of state yields a bulk modulus K₀=202±4 GPa at a fixed K'= 4, and a temperature derivative of bulk modulus (dK/dT)_P = -0.053±0.006) GPa K^-1. Thermal expansion constant (a(T)= a₀+a₁T) were derived as a₀=4.6±0.2) x10^-5 and a₁=0.4±0.2) x10^-8.