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Phase Transitions in Crystalline [M(H2O)6](ClO4)2 (M=Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd and Hg)

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Abstract

The results of DSC measurements in the temperature range 140–370 K on nine crystalline compounds of the type [M(H2O)6](ClO4)2, where M=Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd and Hg, are discussed. Anomalies detected in the DSC curves are related to the existence of solid-solid phase transitions and/or to the melting points of these compounds. In consequence of two different hypothetical structural modifications of [Fe(H2O)6](ClO4)2, two DSC curves are obtained. For the compounds with M=Fe, Cd and Hg, new phase transitions have been discovered. The transition temperatures of the other phase transitions are in good agreement with literature data obtained by adiabatic calorimetry. For the compounds with M=Mg, Ni and Cd, DTA measurements were also carried out and the melting points of theses compounds were established.

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Mikuli, E., Migdał-Mikuli, A. & Mayer, J. Phase Transitions in Crystalline [M(H2O)6](ClO4)2 (M=Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd and Hg). Journal of Thermal Analysis and Calorimetry 54, 93–102 (1998). https://doi.org/10.1023/A:1010112801504

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