The vapour pressure of CdSe was measured between 740 and 900°b y Regnaults method.1 The result is log ¡o2cd X & (atm.3) = log KB = -(34.400) (1/ ) + 20.9 for CdSe of the Wurtzite structure. The standard heat of sublimation of CdSe (25°) is 39.1 kcal./mole, the standard heat of formation-37.5 kcal./mole. The entropy of CdSe (hex) at 25°is 18.6 cal./deg. mole.

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The vapor pressure of ZnSe was measured between 1060 and 1393°K. The equilibrium is described by RT In pz"2 X psei (atm.3) = -186.000 + 99.5T (°K.).

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