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Journal Articles

Phase transition of Bi$$_2$$WO$$_6$$ below 300 K

Yoneda, Yasuhiro; Takeda, Hiroaki*; Tsurumi, Takaaki*

JPS Conference Proceedings (Internet), 1, p.012103_1 - 012103_4, 2014/03

https://doi.org/10.7566/JPSCP.1.012103

Bi$$_2$$WO$$_6$$ is the simplest member of the Aurivillius family of (Bi$$_2$$O$$_2$$)(A$$_{m-1}$$B$$_m$$O$$_{3m+1}$$) with one oxygen octahedron sandwiched between two Bi$$_2$$O$$_2$$ layers (m=1). We report the high-energy synchrotron X-ray diffraction study of ferroelectric Bi$$_2$$WO$$_6$$ at low temperatures, and a new phase transition was found around 200 K. The mechanism of this phase transition was examined by atomic pair-distribution function (PDF) method.

Journal Articles

Local structure analysis of Bi$$_2$$WO$$_6$$

Yoneda, Yasuhiro; Kohara, Shinji*; Takeda, Hiroaki*; Tsurumi, Takaaki*

Japanese Journal of Applied Physics, 51(9), p.09LE06_1 - 09LE06_6, 2012/09

https://doi.org/10.1143/JJAP.51.09LE06
 Times Cited Count：15 Percentile：51.2(Physics, Applied)

Local structure analysis of Bi$$_2$$WO$$_6$$ was performed by high-energy X-ray atomic pair-distribution function (PDF) analysis. We found a deviation between local and average structures owing to the different coherence length between Bi$$_2$$O$$_2$$ and WO$$_6$$ layers. Bi atoms were displaced toward the $$b$$-axis of the orthorhombic $$Pca2_1$$ structure. The local off-center shift of Bi atoms coupled with thermal factor and negrected in the average structure. The coherence length of Bi$$_2$$O$$_2$$ layer increased with increasing temperature and splead in the whole crystal when the average structure changed from $$Pca2_1$$ to $$Aba2$$ structure.

Oral presentation

High-temperatre X-ray diffraction study of Bi$$_2$$WO$$_6$$

Yoneda, Yasuhiro; Kohara, Shinji*; Han, J. S.*; Takeda, Hiroaki*; Tsurumi, Takaaki*

no journal, , 

Bi$$_2$$WO$$_6$$ of a bismuth layered compound is expected as non-lead system ferroelectric. The Curie point is in about 1000$$^circ$$C. Therefore, it was thought that it became possible to synthesize below the Curie point, and the sample of a single domain was obtained easily in crystal breeding by the flux method and the thin film making by the PLD method. However, a lot of observations not thought about were found with a single domain as for the Bi$$_2$$WO$$_6$$ crystal actually made. Then, it is a purpose of this experiment to perform high-temperature X-ray diffraction of Bi$$_2$$WO$$_6$$, and to verify the phase transition system again. As a result of the experiment, it has been understood that additional structural phase transition exists also below the Curie point. The domain configuration changes by the existence of another phase transition caused during cooling afterwards even if the crystal is promoted below the Curie point at the high temperature.

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