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Ferroelectrics Letters Section Volume 31, 2004 - Issue 5-6
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Original Articles

The Nature of Soft Mode and Ferroelectric Phase Transition in SbOxS1−xI and SbSexS1−xI Mixed Crystals

A. AUDZIJONIS Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
,
L. ŽIGAS Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
,
G. GAIGALAS Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
,
V. PAULIKAS Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
,
R. ŽALTAUSKAS Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
,
A. Čerškus Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
&
D. Balnionis Department of Physics, Studentu 39, Vilnius Pedagogical University, Vilnius, Lithuania, 08106
 show all
Pages 113-118 | Received 01 Feb 2004, Published online: 11 Aug 2010
 
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Abstract

The ferroelectric phase transition temperature has different dependence upon the mixture composition x in mixed SbO x S1−x I and SbSe x S1−x I crystals. From dependence of potential energy V(z) upon normal coordinates of the B 1u soft mode at a Sb site of SbO x S1−x I and SbSe x S1−x I crystals we proved that main reason for the growth of T C in SbO x S1−x I crystals is that atomic formfactor VI decrease with increasing x and decrease of T C in SbSe x S1−x I crystals is caused by the increase of VI with increasing x.

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