Vapour Pressure Equations for the Platinum Group Elements: IMPROVED CALCULATIONS OF VAPOUR PRESSURE AND TEMPERATURE

By J. W. Arblaster

doi:10.1595/147106707X213830

ISSN: 0032-1400

oa Vapour Pressure Equations for the Platinum Group Elements

IMPROVED CALCULATIONS OF VAPOUR PRESSURE AND TEMPERATURE
By By J. W. Arblaster¹
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Affiliations: ¹ Coleshill Laboratories, Gorsey Lane, Coleshill, West Midlands B46 1JU, U.K.
Source: Platinum Metals Review, Volume 51, Issue 3, Jul 2007, p. 130 - 135
DOI: https://doi.org/10.1595/147106707X213830
- Published online: 01 Jul 2007

Abstract

While a knowledge of the vapour pressure curve of any material is of theoretical significance in understanding its basic physical properties, it can also be of practical importance in, for example, the use of the material in high-temperature vacuum applications. Therefore readily usable equations which accurately predict values of vapour pressure over a wide range of temperatures and pressures can have an important practical use. For the platinum group metals (pgms) the vapour pressures can be immediately assessed from about 10⁻¹⁶ bar to just above the boiling point by the use of Equation (i), fitted for the solid and liquid metals separately: ln(p, bar) = A + Bln(T) + C/T + DT + ET², where p is the vapour pressure, T is the temperature in kelvin and A, B, C, D and E are constants. Although containing five coefficients, this equation can easily be evaluated by computers and scientific calculators. Although it gives values of vapour pressure at fixed temperatures, by a simple and rapid use of iteration values of temperature at fixed vapour pressure, temperature-dependent values of vapour pressure can also be obtained.

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Vapour Pressure Equations for the Platinum Group Elements

Platinum Metals Review 51, 130 (2007); https://doi.org/10.1595/147106707X213830

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Article Type: Research Article

oa Vapour Pressure Equations for the Platinum Group Elements

IMPROVED CALCULATIONS OF VAPOUR PRESSURE AND TEMPERATURE

Abstract

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