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Ferroelectrics Volume 137, 1992 - Issue 1
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Non-perovskites proper Ferroelectrics

Raman scattering study of incommensurate phase transitions in La2Ti2O7

Kikuo Ohi Department of Physics, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169, Japan
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Syuichi Ishii Department of Physics, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169, Japan; Fuji Photo Film Co., Ltd, Tokyo
&
Hiroshi Omura Department of Physics, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169, Japan; Canon Inc., Tokyo
Pages 133-138 | Received 30 Jun 1991, Published online: 10 Feb 2011
 
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Abstract

Raman spectra of La2Ti2O7 have been measured around the phase transitions at 983 K and 1053 K. The asymmetric lines appeared at about 50 cm−1 in the temperature range from about 673 K to 1053 K. The results are explained by a coupled modes model. One mode becomes soften and broad toward 1053 K.

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