04_06_86 - VAPOR PRESSURE OF THE METALLIC ELEMENTS...

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Unformatted text preview: VAPOR PRESSURE OF THE METALLIC ELEMENTS EQUATIONS C. B. Alcock This table gives coefficients in an equation for the vapor pres- sure of 65 metallic elements in both the solid and liquid state. Vapor pressures in the range 10-10 to 10 2 Pa (10-15 to 10-3 atm) are covered. The equation is: for p in atmospheres: log( p /atm) = A + BT-1 + C log T + DT-3 for p in pascals: log ( p /Pa) = 5.006 + A + BT-1 + C log T + DT-3 for p in torr (mmHg): log ( p /torr) = 2.881 + A + BT-1 + C log T + DT-3 where T is the temperature in K. This equation reproduces the observed vapor pressures to an accuracy of 5% or better. The metals are listed alphabetically by name, and the melting point is included. The table following this one gives values of the vapor pressure at several temperatures in the 400 K to 2400 K range, as calculated from these equations. Reprinted with permission of the publisher, Pergamon Press. Reference Alcock, C. B., Itkin, V. P., and Horrigan, M. K., Canadian Metallurgical Quarterly , 23, 309, 1984. Element Phase A B C D Range/k mp/k Aluminum Solid 9.459-17342-0.7927 298-mp 933 Aluminum Liquid 5.911-16211 mp-1800 Americium Solid 11.311-15059-1.3449 298-mp 1449 Barium Solid 12.405-9690-2.2890 298-mp 1000 Barium Liquid 4.007-8163 mp-1200 Beryllium Solid 8.042-17020-0.4440 298-mp 1560 Beryllium Liquid 5.786-15731 mp-1800 Cadmium Solid 5.9395....
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04_06_86 - VAPOR PRESSURE OF THE METALLIC ELEMENTS...

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