P-V-T relation in aluminium as pressure and temperature scale under very high pressure

A pressure-volume-temperature relation in aluminum was calculated by pseudopotential method and Mie-Grüneisen relation. The thermal dilatation data of aluminum showed good agreement with this calculated value. The calculated results under very high pressure and high temperature environment were compared with NaCl scale by a newly designed X-ray diffraction system with a LiF monochrometer at the receiving slit. Both scales just fitted within an error range. It can be concluded that the proposed aluminum scale is acceptable under very high pressure