Ueber Urmaasse in der Alkali- und Acidimetrie

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Zur Elementaranalyse auf nassem Wege

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Ueber den Nachweis und die Bestimmung des Arsens

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Kristallstrukturen und Phasentransformationen von Caesiumtrihalogenogermanaten(II) CsGeX3 (X = Cl,Br, I)

Crystal Structures and Phase Transformations of Cesium Trihalogenogermanates CsGeX₃(X = Cl, Br, I) The compounds CsGeX₃ (X ? Cl, Br, I) have been obtained by reactions of Ge(OH)₂ with CsX in aquaeous HX solutions. The thermal behavior has been studied by X-ray diffraction. Raman spectroscopy, and DTA/DSC. The compounds are dimorph. The low temperature modifications L-CsGeX₃ show a rhomboedric deformed perovskite type structure. The high temperature phases H-CsGeX₃ form the cubic perovskite type structure. The reversible phase transitions are interpreted as a result of position changes of the Ge atoms in the H-forms (Order-Disorder transitions). The transition temperatures increase in the sequence CsGeCl₃ (155°C), CsGeBr₃ (238°C), CsGeI₃ (277°C).