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Phase Transitions
A Multinational Journal
Volume 80, 2007 - Issue 1-2: East-European Meeting on Ferroelectrics Physics, Lviv 2006, Guest Editors: Ihor Stasyuk, Zbigniew Czapla and Krystian Roleder
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Original Articles

Ferroelectric phase transition in (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 crystals

A. CiŻman Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, PolandCorrespondence[email protected]
,
R. Poprawski Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
&
A. Sieradzki Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
Pages 171-176 | Received 05 Sep 2006, Accepted 07 Sep 2006, Published online: 04 Dec 2010
 
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Abstract

Temperature dependence of the linear birefringence Δn and excess entropy ΔS in a phase transitions regions are presented for the (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 ferroelectric crystals. We have confirmed that there is a linear relation between Δn and ΔS in the temperature range from 285 to 306 K and from 295 to 306 K for (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 crystals, respectively. Our results imply that relation between the linear birefringence and excess entropy can be described by Landau theory.

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