Na(0.5)Bi(0.5)TiO3的四方相——钙钛矿结构的一种新变体。
The tetragonal phase of Na(0.5)Bi(0.5)TiO3--a new variant of the perovskite structure.
作者信息
Jones GO, Thomas PA
机构信息
Department of Physics, University of Warwick, Coventry, England.
出版信息
Acta Crystallogr B. 2000 Jun;56 (Pt 3):426-30. doi: 10.1107/s0108768100001166.
The structure of the tetragonal phase of the A-site-substituted perovskite sodium bismuth titanate, Na(0.5)Bi(0.5)TiO3, has been determined by neutron powder diffraction at 698 K. The structure was refined in space group P4bm with a (= b) = 5.5191 (1), c = 3.9085 (1) A, V= 119.055 (5) A3, Z = 2 and Dx = 5.91 Mg m(-3). The structure exhibits an unusual combination of in-phase (a0a0c+) tilts and antiparallel cation displacements along the polar c axis, which results in a new variant of the perovskite structure.
通过在698K下的中子粉末衍射确定了A位取代的钙钛矿型钛酸铋钠（Na(0.5)Bi(0.5)TiO3）四方相的结构。该结构在空间群P4bm中进行精修，a(=b)=5.5191(1) Å，c = 3.9085(1) Å，V = 119.055(5) ų，Z = 2，Dx = 5.91 Mg m⁻³。该结构呈现出同相（a0a0c+）倾斜和沿极性c轴的反平行阳离子位移的异常组合，这导致了一种新的钙钛矿结构变体。
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