Thermodynamic Properties of the Platinum Metals on ITS-90
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Thermodynamic Properties of the Platinum Metals on ITS-90
Selected properties taken from recent reviews written by the present author of the thermodynamic properties on the International Temperature Scale, ITS-90, are listed in the Tables below (1, 2). Values in these reviews correspond to a standard state pressure of one bar and have been corrected to the 1993 atomic weights (3): ruthenium 101.07, rhodium 102.90550, palladium 106.42, osmium 190.23, iridium 192.217 and platinum 195.08 (revised to 195.078 in 1995) (4).
Selected values for solid rhodium and iridium at 298.15 K and below are based on the assessments of Furukawa, Reilly and Gallagher (5).
Table I
Low Temperature Properties
Table II
Properties at 298.15 K (solid)
Table III
Properties at 298.15 K (gas)
Table IV
Melting Point Properties
* The melting points of all but Os are proposed secondary fixed points on ITS-90 (6)
Table V
Vapour Pressures
NBP: Normal boiling point at one atmosphere pressure (1.01325 bar)
References
- 1
J. W. Arblaster, Platinum Metals Rev., 1994, 38, (3), 119 (Pt)
- 2
J. W. Arblaster, Calphad, 1995, 19, 327 (Pd), 339 (Ru), 349 (Os), 357 (Rh), 365 (Ir)
- 3
Commission on Atomic Weights and Isotopic Abundances, Pure & Appl. Chem., 1994, 66, 2423
- 4
Commission on Atomic Weights and Isotopic Abundances, Pure & Appl. Chem., to be published
- 5
G. T. Furukawa, M. L. Reilly and J. S. Gallagher, J. Phys.Chem. Ref. Data, 1974, 3, 163
- 6
R. E. Bedford, G. Bonnier, A. Maas and F. Pavese, Metrologia, to be published