著者

黒岩 芳弘

出版者

The Crystallographic Society of Japan

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.47, no.2, pp.147-153, 2005-04-27 (Released:2010-09-30)

参考文献数

16

被引用文献数

1

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Electron charge density distributions of perovskite-type dielectric oxides, PbTiO3 (ferroelectric), and PbZrO3 and PbHfO3 (antiferroelectric), have been investigated associated with the phase transitions, by analyzing high-energy synchrotron-radiation powder diffraction data by the maximum entropy method (MEM) /Rietveld method. Two distinctive structural features, that is, disordered Pb atom and anisotropic charge density distributions around O atom, are observed only in PbZrO3 and PbHfO3 in the cubic phase. These features can be a clue to understanding why PbZrO3 and PbHfO3 show antiferroelectric phase transition.