EPR Study of the Phase Transition in Dimethylammonium Gallium Sulfate Hexahydrate

• Authors: R. Hrabański , M. Janiec-Mateja , Z. Czapla
• Languages of publication: EN

Abstracts

EN

X-band electron paramagnetic resonance investigations of single crystals of Cr^{3+}-doped dimethylammonium gallium sulphate hexahydrate are presented from room temperature down to 110 K. The crystal undergoes a order-disorder phase transition to ferroelectric phase at 134 K and additionally a first-order transition into a low temperature non-ferroelectric phase at T_{c2}=116 K. The spin-Hamiltonian parameters were determined for paraelectric and ferroelectric phases. The spin-Hamiltonian parameters in the paraelectric phase are: g=1.982±0.002, b_2^0=(890±10)×10^{-4} cm^{-1}, b=(386±15)×10^{-4} cm^{-1}. Remarkable EPR line width changes confirm the order-disorder character of the ferroelectric phase transition. Additionally observed triplet lines demonstrate freezing-out of dimethylammonium reorientations which can be considered as a prime reason for this transition similarly as observed in dimethylammonium aluminium sulfate hexahydrate.

Keywords

EN

64.70.Kb   76.30.Fc   77.80.-e  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 283-290

Dates

published

2005-08

received

2005-04-24

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Identifiers

DOI

10.12693/APhysPolA.108.283