Structural Phase Transition and Domain Structures in YMn1-xTixO3
スポンサーリンク
概要
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We investigated changes in domain structures induced by a partial substitution of Ti for Mn in multiferroic YMnO3 by transmission electron microscopy (TEM). In the ferroelectric phase of YMnO3 at room temperature, there exist 180-degree ferroelectric (FE) domain structures of a micrometer size. On substituting Ti for Mn, the size of FE domains becomes fragile and, at approximately $x=0.175$ in YMn1-xTixO3, the size can be estimated to be 10–20 nm. On further substitution, it is found that a structural phase transition from a hexagonal P63 cm structure to a new rhombohedral $R \bar{3}c$ one takes place at approximately $x=0.20$. In YMn1-xTixO3 with $0.20<x<0.40$, these two distinct structures (the hexagonal P63 cm and rhombohedral $R \bar{3}c$ structures) coexist and this coexistence should have some strong effect on the ferroelectric properties such as the magnetocapacitance effect found in Ti-substituted YMnO3.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-09-15
著者
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MORI S.
Department of Physics, Faculty of Science, Shinshu University
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Katsufuji T.
Department Of Advanced Materials Science University Of Tokyo
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Tokunaga J.
Department of Physics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
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Horibe Y.
Department of Physics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
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Aikawa Y.
Department of Physics, Waseda University, Shinjyuku-ku, Tokyo 169-8555, Japan
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Katsufuji T.
Department of Physics, Waseda University, Shinjyuku-ku, Tokyo 169-8555, Japan
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