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Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω
á à Á À é è É È ç Ç ê
Ä Ö Ü ä ö ü ß
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½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞ ¹ ² ³ ⁴ ⁿ ₁ ₂ ₃ ₄
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      저자 : Yasuhiro Yoneda (검색결과 2 건)
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        Local Structure Analysis of Bi0.5Na0.5TiO3

        Yasuhiro Yoneda,Hajime Nagata,Tadashi Takenaka 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9

        The potential lead-free piezoelectric material bismuth sodium titanate, Bi0.5Na0.5TiO3 (BNT), was investigated by means of high-energy synchrotron X-ray diffraction. BNT has been assumed thus far to exhibit the rhombohedral space group R3c at room temperature. Recently, the average structure of BNT was described by the monoclinic space group Cc. We performed a local structure analysis of BNT using atomic pair-distribution function method. The ground state of BNT was found to have a rhombohedral structure in which bismuth and sodium atoms were chemically ordered in the perovskite A-site.

      • KCI등재

        Local Structure Analysis of BaTiO3 and BiFeO3 in the High-temperature Cubic Phase

        Yasuhiro Yoneda,Shinji Kohara 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2

        BaTiO3 and BiFeO3 are ABO3 perovskite ferroelectric materials and have different phase tran- sitions though have the same average structure in the high-temperature paraelectric phase. The purpose of this work was to clarify the local structures of BaTiO3 and BiFeO3 in the cubic phase and to elucidate the mechanism of the ferroelectric phase transitions. A local structure analysis was carried out using the X-ray pair-distribution function (PDF) obtained from high-energy synchrotron X-ray diffraction. A clear difference in the local structures of the high-temperature cubic phase was found. The difference in the short-range order structure of the cubic phase and the difference in the ferroelectric phase transition can be explained by the local environment around the A-site atoms on the basis of the tolerance factor. BaTiO3 and BiFeO3 are ABO3 perovskite ferroelectric materials and have different phase tran- sitions though have the same average structure in the high-temperature paraelectric phase. The purpose of this work was to clarify the local structures of BaTiO3 and BiFeO3 in the cubic phase and to elucidate the mechanism of the ferroelectric phase transitions. A local structure analysis was carried out using the X-ray pair-distribution function (PDF) obtained from high-energy synchrotron X-ray diffraction. A clear difference in the local structures of the high-temperature cubic phase was found. The difference in the short-range order structure of the cubic phase and the difference in the ferroelectric phase transition can be explained by the local environment around the A-site atoms on the basis of the tolerance factor.

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