Knudsen and Langmuir Evaporation Studies of Stannic Oxide
作者： C. L. HOENIG , ALAN W. SEARCY
DOI: 10.1111/J.1151-2916.1966.TB15390.X
关键词: Dissociation (chemistry) 、 Langmuir 、 Molecule 、 Analytical chemistry 、 Chemical equilibrium 、 Enthalpy 、 Oxide 、 Chemistry 、 Knudsen number 、 Crystallite
摘要: A Knudsen study of the reaction SnO2(c) = SnO(g) +½O2(g) yielded for enthalpy dissociation SnO(g), D°0= 5.44 × 0.1 ev/molecule, which is in agreement with literature values (average 5.5 ev/molecule) obtained by various methods. Langmuir studies indicated an evaporation coefficient upper limit measured reaction. The activation (ΔH*298= 134 2.9 kcal/mole), as calculated second-law method, less than that equilibrium 143.4 1.1 but probably should be considered to agree within experimental error. Electron micrographs showed evidence stepwise depends on crystallographic orientation polycrystalline grains.
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