Local structure analysis of BiWO

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

Local structure analysis of BiWO 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 BiO and WO layers. Bi atoms were displaced toward the -axis of the orthorhombic structure. The local off-center shift of Bi atoms coupled with thermal factor and negrected in the average structure. The coherence length of BiO layer increased with increasing temperature and splead in the whole crystal when the average structure changed from to structure.