Abstract
X-band electron paramagnetic resonance (EPR) investigations of single crystals of Cr3+-doped dimethylammonium aluminium sulphate hexahydrate are presented from 100 K to room temperature. The crystal undergoes a phase transition at 152 K from the ferroelastic to the ferroelectric phase. The spin-Hamiltonian parameters have been determined for both phases. The spin-Hamiltonian parameters in the ferroelectric phase are:g=1.980±0.003,b 02 =(1140±15)·10−4 cm−1,b 22 =(214±10)·10−4 cm−1. Remarkable EPR line width changes confirm the order-disorder character of the ferroelectric phase transition on a microscopic level and demonstrate that the dimethylammonium reorientation freezing-out is the prime reason for this transition.
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Hrabański, R., Janiec, M. & Kapustianik, V. EPR study of the ferroelectric phase transition in chromium-doped DMAAS. Appl. Magn. Reson. 27, 19–27 (2004). https://doi.org/10.1007/BF03166298
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DOI: https://doi.org/10.1007/BF03166298