Local structure analysis of NaNbO 3 and AgNbO 3 modified by Li substitution

Abstract We analyzed the local structures of NaNbO 3 and AgNbO 3 by combining the X-ray absorption fine structure (XAFS) and atomic pair-distribution function (PDF) techniques. NaNbO 3 is known to be an antiferroelectric material at room temperature. It also undergoes a diffuse phase transition, in...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 55; no. 10S; p. 10
Main Authors Yoneda, Yasuhiro, Aoyagi, Rintaro, Fu, Desheng
Format Journal Article
LanguageEnglish
Published 01.10.2016
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Summary:Abstract We analyzed the local structures of NaNbO 3 and AgNbO 3 by combining the X-ray absorption fine structure (XAFS) and atomic pair-distribution function (PDF) techniques. NaNbO 3 is known to be an antiferroelectric material at room temperature. It also undergoes a diffuse phase transition, in which orthorhombic and rhombohedral phases coexist over a wide temperature range. We found a disordered feature in the nearest-neighbor bond distance corresponding to the Nb–O bonds. The disordered bond distribution disappeared when Li was substituted for Na. A similar disorder feature was found in AgNbO 3 . The disordered site can be specified by combining XAFS and PDF techniques. The sequences of disordered and complex phase transitions are attributable to the competition between the tolerance of the AO 12 cage and the tilt of NbO 6 octahedra.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.55.10TC04