The thermal degradation products of Ce2(MoO4)3 · 4.5 H2O were studied by means of thermogravimetric analysis, x‐ray diffraction and spectroscopical methods under rigorously controlled conditions. From the crystalline hydrate various amorphous and crystalline products with a Ce/Mo ratio 2/3 may be obtained by variation of the thermal and atmospheric conditions. In nitrogen, the decomposition pattern leads directly to Ce2(MoO4)3 with a pseudo‐scheelite structure, in air or oxygen atmosphere oxidation takes place below 450°C, resulting in amorphous or crystalline ceric molybdate, γ‐Ce2Mo3O13. About above 500°C both in inert and oxidizing conditions oxygen desorption leads to Ce2(MoO4)3. Reoxidation of this compound to Ce2Mo3O12,25 is possible at higher temperatures, giving also CeO2 by oxidative degradation. The thermal stability of γ‐CeMo3O13 differs from other such substances with the same stoichiometric composition.

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Die unter streng kontrollierten Bedingungen erhaltenen Abbauprodukte von Cez (MoO4)3 ′ 4,5 H2O werden durch TGA, Röntgenbeugung und spektroskopische Methoden (UV, Sichtbar) untersucht.