Temperature dependence of the effective work function for the BaO - W system

Abstract

The temperature dependence of the work function has been examined for the BaO-W system for degrees of coating Θ less than 1 and about 1 in the range 700–1400 °K; it is found that a monomolecular film gives a negative sign of this coefficient in this temperature range (Δϕ /ΔT ∼ 10−4 −10−3 eV/deg). At 1000–1200 °K, the temperature coefficient is almost zero, while at 1200–1400 °K there is a positive value. If the covering is less than monomolecular, the sign is positive throughout the entire temperature range (Δϕ/ΔT ∼ 10−4 eV/deg).