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The p-V-T equation of state of magnesium metal has been measured up to 20 GPaand 1500 K using both multianvil and opposite anvil techniques combined withsynchrotron X-ray diffraction. To fit the experimental data, the model ofAnderson-Gr\"uneisen has been used with fixed parameter {\delta}T. The 300-Kbulk modulus of B0 = 32.5(1) GPa and its first pressure derivative, B0' =3.73(2), have been obtained by fitting available data up to 20 GPa to Murnaghanequation of state. Thermal expansion at ambient pressure has been describedusing second order polynomial with coefficients a = 25(2)x10-6 K-1 and b =9.4(4)x10-9 K-2. The parameter describing simultaneous pressure and temperatureimpact on thermal expansion coefficient (and, therefore, volume) is {\delta}T =1.5(5). The good agreement between fitted and experimental isobars has beenachieved to relative volumes of 0.75. The Mg melting observed by X-raydiffraction and in situ electrical resistivity measurements confirms previousresults and additionally confirms the p-T estimations in the vicinity ofmelting.

Thermoelastic equation of state and melting of Mg metal at high pressure and high temperature