Abstract
The reaction between tungsten and bromine has been studied in the temperature interval between 1000 and 1500 K by means of a Knudsen double cell connected to a mass spectrometer. At pressures of bromine between 6 and 50 torr in the reaction cell only WBr 4(g) is formed while at higher pressures formation of W 2Br 6(g) could be observed as the result of a secondary gas-phase reaction. From the measured intensities of different ions the pressure-temperature curve obtained for WBr 4(g) exhibits abnormalities which could be explained in terms of the reaction kinetics leading to equilibrium conditions above 1270 K. On the basis of these considerations ΔH 4 o (−36.7 ± 1.7 kcal/mole), ΔG T o (−8.6 ± 0.6 kcal/mole) and ΔS T o (−21.3 ± 1 e.u.) have been obtained and compared with some thermodynamic data calculated using the third-law method.
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