Phase transitions of polycrystalline [Fe(H2O)6](ClO4)3 and [Cr(H2O)6](ClO4)3 studied by DSC

被引：0
作者：
E. Mikuli
B. Grad
K. Zaremba
S. Wróbel
机构：
[1] Jagiellonian University ul. Ingardena 3,Department of Chemical Physics, Faculty of Chemistry
[2] Jagiellonian University ul. Reymonta 4,Department of Solid State Physics, M. Smoluchowski Institute of Physics
来源：
Journal of Thermal Analysis and Calorimetry | 2004年 / 76卷
关键词：
phase transitions; DSC; FT-IR; FT-RS; hexaaquachromium(III) chlorate(VII); hexaaquairon(III) chlorate(VII);
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摘要：
Fourier transform far- and mid-infrared (FT-FIR and FT-MIR) and Fourier transform Raman scattering (FT-RS) spectra of [Fe(H2O)6](ClO4)3 and [Cr(H2O)6](ClO4)3 indicate that these compounds are ionic molecular crystals built from complex cations and complex anions of octahedral (Th) and tetrahedral (Td) symmetry, respectively. The thermodynamic parameters for two phase transitions in polycrystalline [Fe(H2O)6](ClO4)3 and [Cr(H2O)6](ClO4)3 were determined by differential scanning calorimetry (DSC): melting of the crystals (at Tm=359.2 and 363.1 K) and solid-solid phase transition (at TC1=126.5 and 139.4 K), respectively.
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页码：719 / 726
页数：7
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