EPR Studies of the Order-Disorder Phase Transition in DMAAS Crystal

X-band electron paramagnetic resonance (EPR) investigations of single crystals of Cr 3+ -doped dimethylammonium aluminium sulphate hexahydrate (DMAAS) are presented from 100 K to room temperature. The crystal undergoes a phase transition at 152 K from ferroelastic to ferroelectric phase. The spin Ha...

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Bibliographic Details
Published in:Ferroelectrics 2003-01, Vol.291 (1), p.241-249
Main Authors: Hrabanski, R., Janiec, M., Jackowska, M., Kapustianik, V.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Dmaas
Electron paramagnetic resonance and relaxation
Epr
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Ferroelectrics
Iron group (3d) ions and impurities (ti-cu)
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Phase transitions and curie point
Physics
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Summary:X-band electron paramagnetic resonance (EPR) investigations of single crystals of Cr 3+ -doped dimethylammonium aluminium sulphate hexahydrate (DMAAS) are presented from 100 K to room temperature. The crystal undergoes a phase transition at 152 K from ferroelastic to 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 2 0 = (1140 - 15) 10 m 4 cm m 1, b 2 2 = (214 - 10) 10 m 4 cm m 1 . Remarkable EPR linewidth 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.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190390222736