Mass spectrometric study of vaporization of cesium tellurate and tellurite

• Published in: Journal of nuclear materials Vol. 210; no. 1; pp. 167 - 171
• Main Authors: Semenov, G.A., Fokina, L.A., Mouldagalieva, R.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.1994
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/0022-3115(94)90234-8

The process of vaporization of cesium tellurate and tellurite was studied by the Knudsen effusion method with a mass spectrometric analysis of the vapor composition. The thermal dissociation of Cs 2TeO 4 to Cs 2TeO 3 and the congruent vaporization of Cs 2TeO 3 were established. Thermodynamic functions for gaseous Cs 2TeO 3 have been calculated. The standard enthalpy of sublimation Δ s H° (298.15) = 268.1 ± 13.0 kJ mol −1 was determined by the 2nd and 3rd laws of thermodynamics. The enthalpy of formation Δ s H° (298.15) = −725.1 ± 13.0 kJ mol −1 for gaseous Cs 2TeO 3 and the enthalpy of atomization Δ at H°(298.15) = 1841.3 ± 15.0 kJ mol −1 have been computed.