3D local structure analysis of relaxor ferroelectrics by X-ray fluorescence holography

蛍光X線ホログラフィによるリラクサー強誘電体の三次元局所構造解析

Hu, W.; 林 好一*; 八方 直久*; 大和田 謙二; Chen, J.*; Ye, Z.-G*; 細川 伸也*; 高橋 正光

Hu, W.; Hayashi, Koichi*; Happo, Naohisa*; Owada, Kenji; Chen, J.*; Ye, Z.-G*; Hosokawa, Shinya*; Takahashi, Masamitsu

Relaxor ferroelectrics as a class of disordered crystals possessing peculiar structure and properties have attracted significant research attention. However, quantitative analysis of its local structure and lattice distortion is difficult by conventional diffraction methods. In the present work, the authors carried out X-ray fluorescence holography experiments on PMN and La-doped PMN (PLMN) single crystals at BL22XU of SPring-8 and successfully obtained 3D atomic images around Nb and Pb elements up to 20 with atomic resolution, respectively. The local distortion of Pb atoms was directly revealed by comparing the atomic images with the reference sample SrTiO (ideal perovskite structure). We will discuss the differences between PMN and PLMN by comparing the obtained middle range local structures around Nb and Pb, and the pure structure of the chemical ordered domains on the atomic scale.