Polarized single crystal absorption spectroscopy of the Pnam-P2 1 / a transition of Ilvaite Ca(Fe 2+ , Fe 3+ )Fe 2+ Si 2 O 8 (OH) as measured between 300 K and 450 K
作者： B. Güttler , E. Salje , S. Ghose
DOI: 10.1007/BF00202218
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摘要: The temperature dependence of the absorption spectra ilvaite, Ca(Fe2+,Fe3+)Fe2+Si2O8(OH), shows strongly one dimensional transport behaviour with no singularity at Pnam-P21/a phase transition point near 335 K. Polarized single crystal transmission measurements were carried out between 300 K and 450 in a frequency range 600 23 000 cm−1. No Drude —absorption low energies was found any temperature. A macroscopic, thermodynamic model based on Landau-Ginzburg theory is given which accounts for observed macroscopic properties structural its coupling Fe2+-Fe3+ ordering. This ordering scheme discussed an atomistic level compared magnetite trans-(CH) x .
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