2014年
TSUKUBA INTERNATIONAL CONFERENCE ON MATERIALS SCIENCE 2013
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- ,
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- 担当区分
- 分担執筆
- 担当範囲
- Elastic anomaly and order-disorder nature of multiferroic barium sodium niobate studied by broadband brillouin scattering
- 出版者・発行元
- IOP PUBLISHING LTD
- 記述言語
- 英語
- 著書種別
- 学術書
- DOI
- 10.1088/1757-899X/54/1/012018
- ISBN
The successive phase transitions of multiferroic barium sodium niobate, Ba2NaNb5O15 (BNN), were studied by Brillouin scattering. The LA, TA modes, and central peak were measured in a large temperature range from room temperature up to 750 degrees C. In the vicinity of a ferroelectric phase transition at about T-C = 585 degrees C from the prototypic tetragonal 4/mmm to ferroelectric 4mm phases, elastic anomaly was observed for LA and TA modes. In addition, the order-disorder nature was observed by the temperature dependence of a central peak. For further cooling another elastic anomaly was also observed in the vicinity of a ferroelastic incommensurate phase transition at about T-IC = 285 degrees C into orthorhombic 2mm phase with the appearance of incommensurate modulation. The large thermal hysteresis of elastic anomaly near T-IC can be attributed the typical feature of the type III incommensurate phase transition predicted recently by Ishibashi and Iwata (2013 J. Phys. Soc. Jpn. 82 044703).
- ID情報
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- DOI : 10.1088/1757-899X/54/1/012018