Local structure analysis of relaxor ferroelectrics Pb(MgNb)O

Yoneda, Yasuhiro   ; Taniguchi, Hiroki*; Noguchi, Yuji*

Many structural models have been proposed for relaxer ferroelectrics Pb(MgNbO. We have shown that the Pb-O distance obtained from the mean structure differs from the Pb-O distance obtained from the X-ray absorption fine structure (XAFS). Since the deviation between the average structure and the local structure is considered to be derived from the characteristic environment of the Pb atom, the behavior similar to that of the Pb atom in the pyrochlore type Pb SnO is assumed and the local structure is assumed. I tried structural modeling. A pair-distribution function (PDF) analysis was performed, and as a result of local structure modeling, it was suggested that there is a network structure of Pb atoms that is different from the periodicity of the lattice system.