Linear Birefringence Changes in Betaine Phosphite Crystal |
| B. Kosturek , J. Przesławski and Z. Czapla Institute of Experimental Physics, University of Wrocław, Cybulskiego 36, 50-205 Wrocław, Poland |
| Received: February 11, 1993; in final form: March 30, 1993 |
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| 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. |
| DOI: 10.12693/APhysPolA.83.769 PACS numbers: 64.70.Kb, 78.20.Fm |