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Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal

100%

Kosturek B., Czapla Z.

Acta Physica Polonica A

2004

vol. 106

issue 4

529-534

Pyridinium perchlorate and pyridinium fluoroborate were grown and their successive phase transitions were studied by means of polarized microscopic observations and measurements of linear birefringence temperature changes. The microscopic observations revealed domain structure appearance at 245 K and 238.7 K for pyridinium perchlorate and pyridinium fluoroborate, respectively. This domain structure exists also in lower phases. Birefringence measurements confirmed two first-order phase transitions at 245.3 K and 231.5 K for pyridinium perchlorate and two continuous phase transitions at 238.7 K and 205.4 K for pyridinium fluoroborate.

Linear Birefringence Changes in Betaine Phosphite Crystal

81%

Kosturek B., Przesławski J., Czapla Z.

Acta Physica Polonica A

1993

vol. 83

issue 6

769-775

Linear birefringence temperature changes are measured in the betaine phoshite crystal. The linear birefringence increments induced by antiferrodistortive, structural and ferroelectric phase transitions are analysed. Temperature derivatives of the linear birefringences are shown for comparison. Critical exponents are determined for both transitions. The antiferrodistortive phase transition is close to a tricritical one.

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2 Acta Physica Polonica A

1 2004

1 1993

2 Czapla Z.

2 Kosturek B.

1 Przesławski J.

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Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal

Linear Birefringence Changes in Betaine Phosphite Crystal