Phase Transitions in Crystalline [M(H2O)6](ClO4)2 (M=Mg,Mn, Fe,Co, Ni,Cu, Zn,Cd and Hg) |
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| Authors: | Mikuli E. Migdał-Mikuli A. Mayer J. |
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| Affiliation: | (1) Department of Chemical Physics, Faculty of Chemistry of the Jagiellonian University, Ingardena Street 3, 30-060 Cracow;(2) H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego Street 152, 31-342 Cracow, Poland |
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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. This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | DSC and DTA phase transitions in hexaaquametal(II) chlorates(VII) |
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