Nanoscale structural analysis of ferroelectrics using high-energy synchrotron X-ray diffraction

Yoneda, Yasuhiro   ; Yamada, Hiroki*

In addition to research on structural analysis using binary correlation distribution functions using synchrotron radiation, the diffractometer at SPring-8, a large synchrotron radiation facility, will be introduced. A feature of the atomic pair-distribution function (PDF) is that it can cover not only the local structure region but also the middle-range structure of the nanoscale order. As an example of applying PDF analysis to ferroelectrics, the results of local structural analysis of BiFeO-BaTiO-Bi (MgTi)O (BF-BT-BMT) are shown. When fitted with the cubic crystal structure of the average structure, a large difference occurs at 40 or less, revealing the existence of lattice strain, which is the mechanism of polarization.