Synthesis and structure of novel layered perovskite oxides: Li2La1.78Nb0.66Ti2.34O10, and a new family, Li2[A0.5nBnO3n + 1]
Synthesis and structure of novel layered perovskite oxides: Li2La1.78Nb0.66Ti2.34O10, and a new family, Li2[A0.5nBnO3n + 1]
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新型层状钙钛矿氧化物Li2La1.78Nb0.66Ti2.34O10和新族Li2[A0.5nBnO3n 1]的合成和结构
DOI：
10.1039/a903720i
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发表时间：
1999
影响因子：
--
通讯作者：
J. Fourquet
中科院分区：
文献类型：
--
作者：
N. Bhuvanesh;M. Crosnier;H. Duroy;J. Fourquet
首次合成了层状钙钛矿Li2[AxBnO3n+1](A=Ca，Sr，La；B=Nb，Ta，Ti，Fe)系列的几个新成员(n=2，3，4)。用粉末X射线衍射法测定了Li2SrNb2O7和Li2SrTa2O7的结构，用单晶X射线衍射法测定了Li2La1.78Nb0.66Ti2.34O10和Li2Sr2Nb3.97Fe0.03O12.97的结构，结果表明这些新相与Ruddlesden-Popper系列化合物A‘2[An-1MnO3n+1]有关。当n=2个成员的结构与RP系列相同时，在较高的成员中，A位被部分占据。有趣的是，A=Ca，Sr和B=Nb，Ta，Fe的化合物表明形成了一个通式为Li2A0.5nBnO3n+1的新的氧化物家族，其中该家族的不同成员可以用同一组A和B原子合成。
Several new members (n = 2, 3, 4 members) of the family of layered perovskites Li2[AxBnO3n + 1] (A = Ca, Sr, La; B = Nb, Ta, Ti, Fe) have been synthesized for the first time. The structure analysis of Li2SrNb2O7 and Li2SrTa2O7 determined by powder X-ray diffraction (XRD), and of Li2La1.78Nb0.66Ti2.34O10 and Li2Sr2Nb3.97Fe0.03O12.97 determined by single crystal XRD data, shows that these novel phases are related to the Ruddlesden–Popper series of compounds, A′2[An – 1MnO3n + 1]. While the structures of n = 2 members are identical to the RP series, in the higher members the A sites are partially occupied. Interestingly, the compounds for A = Ca, Sr and B = Nb, Ta, Fe indicate the formation of a new family of oxides of general formula Li2A0.5nBnO3n + 1 where different members of the family can be synthesized with the same set of A and B atoms.