Electron Paramagnetic Resonance and DTA Investigation of Cr in Tris(guanidinium) Hexafluoroaluminate Single Crystals
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چکیده
Electron Paramagnetic Resonance (EPR) studies of Cr in single crystals of tris(guanidinium) hexafluoroaluminate, [C(NH2)3]3A1F6, have been carried out in the X-band region. A temperature dependent study of the zero-field splitting parameter D in the range 77 398 K shows the presence of a phase transition, which is supported by Differential Thermal Analysis. In addition, F superhyperfine structure has been observed in the 9.3% naturally abundant Cr isotope hyperfine structure. D shows a large decrease with increasing temperature. The phase transition brings about a chemical inequivalence in the two chemically equivalent but magnetically inequivalent room temperature (CrF6)" species. Comparison is made with the alums A1C13 • 6H 2 0, as well as other guanidinium aluminum salts.
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تاریخ انتشار 2012