具有A位阳离子层状有序排列的钙钛矿结构。
Structure for perovskites with layered ordering of A-site cations.
作者信息
Howard Christopher J, Zhang Zhaoming
机构信息
Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
出版信息
Acta Crystallogr B. 2004 Apr;60(Pt 2):249-51. doi: 10.1107/S0108768104003714. Epub 2004 Mar 18.
The structure of La(1/3)NbO3 is that of a perovskite with La3+ cations ordered into alternate layers of perovskite A-sites. This is the description of a tetragonal structure and yet the room-temperature structure shows an orthorhombic distortion. The structure of La(2/3)TiO3 shows similar features. It has been recognized only very recently that the orthorhombic distortion in both these compounds is due to octahedral tilting. It seems clear from the literature that Ce(2/3)TiO3, Pr(2/3)TiO3, Nd(2/3)TiO3 and Ce(1/3)NbO3 adopt the same structure. Structures of other perovskites, such as Ln(2/3)TiO3, Ln(1/3)NbO3 and Ln(1/3)TaO3 (Ln = lanthanoid), when orthorhombically distorted, may be similar.
La(1/3)NbO3的结构是一种钙钛矿结构，其中La3+阳离子有序排列在钙钛矿A位的交替层中。这是对四方结构的描述，但室温结构显示出正交畸变。La(2/3)TiO3的结构也显示出类似的特征。直到最近才认识到，这两种化合物中的正交畸变是由于八面体倾斜引起的。从文献中似乎可以清楚地看出，Ce(2/3)TiO3、Pr(2/3)TiO3、Nd(2/3)TiO3和Ce(1/3)NbO3采用相同的结构。其他钙钛矿，如Ln(2/3)TiO3、Ln(1/3)NbO3和Ln(1/3)TaO3（Ln = 镧系元素），当发生正交畸变时，其结构可能相似。
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