Molar volumes of molten indium at high pressures measured in a diamond anvil cell

Molar volumes of molten indium have been measured in an isothermal compression up to 8.5 GPa at 710(3) K in an externally heated diamond anvil cell. The measurement is based on the x-ray diffraction and x-ray absorption of materials using a synchrotron monochromatic x-ray microbeam. The fit to the results with the Birch–Murnaghan equation of state gives parameters of V0=16.80 cm3, K0=23.9(6) GPa, assuming that K′=4. This method should be applicable for measuring molar volumes of liquids and other amorphous materials in the diamond anvil cell.