The Vapor Pressure of Plutonium Halides

Abstract

Vapor pressure measurements have been made with three halides of plutonium by a modification of the Knudsen effusion method. Measurements with solid plutonium trifluoride from 1200°K to 1440°K give the vapor pressure‐temperature relation log₁₀p_mm=12.468–21,120/T. Measurements with liquid plutonium trifluoride from 1440°K to 1770°K give log₁₀p_mm=11.273–19,400/T. Measurements with solid plutonium trichloride from 850°K to 1007°K give log₁₀p_mm=12.726–15,910/T; with liquid trichloride from 1007°K to 1250°K give log₁₀p_mm=9.509–12,590/T. Measurements with solid plutonium tribromide from 800°K to 929°K give log₁₀p_mm=13.386–15,280/T; with liquid tribromide from 929°K to 1100°K give log₁₀p_mm=10.321–12,360/T.