The Thermodynamic Properties of Platinum on ITS-90

Platinum exists in a face-centred cubic structure with a lattice parameter at 20°C of 0.39235 nm and a density of 21.45 g/cm3 (1, 2). The freezing point is a proposed secondary fixed point on the International Temperature Scale ITS-90 at 1768.1"C (3). Wherever pos-sible values have been corrected to the currently accepted atomic weight of 195.08 (4) and to the ITS-90 temperature scale (5-9), including the further correction to this scale between 630.615 and 1064.18"C (10-12). Previous assessments for platinum were performed by Hultgren and co-workers (1 3)