Inhaltsiibcrsicht Die Sublimationsdrucke der Halogenide von Lanthan, Cer, Praseodym und Neodym (ausschlieBlich der Fluoride und von Cerjodid) wurden nach der KNuDsENschen Effusionsmethode gemessen, aus den MeBergebnissen wurden die Sublimationswarme und andere thermodynamische Werte der Salze berechnet. Wenn der Radius des Kations abnimmt odcr der des Anions zunimmt, also beini ijbergang vom Lanthanchlorid zum Keodymchlorid oder vom Lanthanchlorid zum Lanthanjodid, sinkt die Sublimationswarme; dies wird als Folge der Deformation der Ionen angesehen.
The apparent vapor pressure of solid germanium dioxide, or the dissociation pressure for the reaction GeO2(c) = GeO(g)+1/2 O2(g), was measured over the temperature range 1,040 – 1,100°C by the Knudsen’s effusion method; the results are expressed by equation (4).
From the free energy equation, the heat of reaction, the free energy and the entropy change of the reaction were calculated as ΔH298=121.7±0.3kcal./mol., ΔG298=101.7kcal./mol. and ΔS298=67.3 e.u., respectively. The heat of reaction is in good agreement with the value calculated from accessible thermal data. The normal entropy of solid germanium dioxide was calculated as S298=10.8±1.0 e.u., which is in agreement with the computed value obtained by Bues and von Wartenberg.
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