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2005 | 108 | 2 | 283-290
Article title

EPR Study of the Phase Transition in Dimethylammonium Gallium Sulfate Hexahydrate

Content
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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
Year
Volume
108
Issue
2
Pages
283-290
Physical description
Dates
published
2005-08
received
2005-04-24
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv108n207kz
Identifiers
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