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

Discipline

• 76.30.Fc: Iron group (3d) ions and impurities (Ti-Cu)
• 77.80.-e: Ferroelectricity and antiferroelectricity

• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 283-290

Dates

published

2005-08

received

2005-04-24

Contributors

author

R. Hrabański

• Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland

author

M. Janiec-Mateja

• Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland

author

Z. Czapla

• Institute of Experimental Physics, University of Wrocław, pl. Borna 8, 50-204 Wrocław, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.283