Abstract
The pressure–volume–temperature behavior of osmium was studied at pressures and temperatures up to 15 GPa and 1273 K. In situ measurements were conducted using energy-dispersive synchrotron X-ray diffraction in a T-cup 6–8 high pressure apparatus. A fit of room-temperature data by the third-order Birch–Murnaghan equation-of-state yielded isothermal bulk modulus K 0=435(19) GPa and its pressure derivative K′ 0=3.5(0.8) GPa. High-temperature data were analyzed using Birch–Murnaghan equation of state and thermal pressure approach. The temperature derivative of bulk modulus was found to be −0.061(9) GPa K −1. Significant anisotropy of osmium compressibility was observed.
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