Search results

Sort By:

Limit search:

EPR Study of the Phase Transition in Dimethylammonium Gallium Sulfate Hexahydrate

100%

Hrabański R., Janiec-Mateja M., Czapla Z.

Acta Physica Polonica A

2005

vol. 108

issue 2

283-290

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.

Refine search results

1 Acta Physica Polonica A

1 2005

1 Czapla Z.

1 Hrabański R.

1 Janiec-Mateja M.

Search results

EPR Study of the Phase Transition in Dimethylammonium Gallium Sulfate Hexahydrate