Vaporization of Ruthenium and Osmium

摘要

The vapor pressures of ruthenium and osmium have been determined by the use of Langmuir vaporization and Knudsen effusion techniques. The vapor pressure of ruthenium over the temperature range 2000deg; to 2500deg;K is represented by the equationlogpmmequals;10.81ndash;33480sol;T, and the vapor pressure of osmium over the temperature range of from 2300deg; to 2800deg;K by the equationlogpmmequals;10.85ndash;40950sol;T. Thirdhyphen;law analyses of the data yield the following heats of vaporization: rutheniumDgr;Hcompfn;298equals;154.9plusmn;1.3kcal/mole; osmiumDgr;Hcompfn;298equals;187.4plusmn;0.9kcal/mole. Estimated boiling points for ruthenium and osmium are 4350deg;plusmn;100deg;K and 5300deg;plusmn;100deg;K, respectively.