The paraelectric cubic structure of (Bi1/2Na1/2)TiO3 was analyzed precisely by high-energy synchrotron radiation X-ray powder diffraction measurement and the maximum entropy method (MEM)/Rietveld method. The 100 -favored rotator-like thermal behavior of the Bi ion was observed. The 100 off-centering of Bi led to the Bi-O distance of similar to 2.5 angstrom that was shorter than the average Bi-O distance in the structure of the Bi on-centered model. The off-centering of Bi can be attributed to the orbital hybridization between the Bi and O ions. (C) 2014 The Japan Society of Applied Physics
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