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Abstract
The atomic-scale structure of Ti-related perovskite materials, ATiO3 (A = Sr, Ba, Pb), has been studied using high-energy X-ray diffraction, Rietveld refinement, and the atomic pair-distribution function technique. It was found that the local structures of BaTiO3 and PbTiO3 deviate from their average structures. We also found the tetragonal distortion in their middle-range-order structures (∼ 7 Å). The temperature dependence of the middle-range-order structures showed that an order-disorder character exists in BaTiO3 and a displacive-type character exists in PbTiO3.
Acknowledgment
The author thanks Prof. Noguchi of the University of Tokyo for supplying the high-quality PbTiO3 crystals used in this work. The synchrotron radiation experiments were performed at beamlines BL04B2 and BL14B1 in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2011B1129, 2012B3608).
Funding
This work was partially supported by a Grant-in-Aid for Scientific Research (C) (No. 26400326) from the Ministry of Education, Culture, Sports, Science and Technology.