A Structural Study of the Incommensurate-to-Ferroelectric Phase Transition in K_2SeO_4
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概要
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The crystal structure of K,SeO. in the ferroelectric phase was analyzed andthe structural change at the transition from incommensurate to ferroelectric phasewas elucidated. The phase transition is characterized by a commensuration ofstructural modulation as well as an additional homogeneous structural changeboth in rotation of Sea. radicals around the ,v'-axis and in translation of K ionsalong the z-axis. The spontaneous polarization in the ferroelectric phase is esti-mated on the basis of these structural changes and the contribution of the latteradditional part is presumed to attain 60 '/; or so. The symmetry coordinate com-ponents of I. soft mode were determined and the feature of atomic displacementresponsible to this transition is discussed.
- 社団法人日本物理学会の論文
- 1984-08-15
著者
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Yamada Noboru
Department Of Applied Physics Faculty Of Engineering Tohoku University
-
Ikeda Takuro
Department Of Applied Physics Faculty Engineering Tohoku University
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Ono Yasuhiro
Department Of Applied Chemistry Faculty Of Engineering & High Technology Research Center Kansai
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Yamada Noboru
Department of Applied Physics and Chemistry, The University of Electro-Communications
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