Rates of effusion of zirconium tetrabromide, between 400 and 500 K, depend on the orifice size. Using Motzfeldt's method, an equilibrium vapour pressure equation was obtained as log(p/bar)=–5569/T+ 8.937, giving ΔH= 106.62 ± 3.55 kJ mol–1 and ΔS= 171.12 ± 1.51 J deg.–1 mol–1 for the sublimation process.
A. S. Normanton and R. A. J. Shelton, Trans. Faraday Soc., 1970, 66, 33 DOI: 10.1039/TF9706600033
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