Parent of misfit-layered cobalt oxides: [Sr2O2]qCoO2
Parent of misfit-layered cobalt oxides: [Sr2O2]qCoO2
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DOI：
10.1021/cm0519176
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发表时间：
2005-11
影响因子：
8.6
通讯作者：
H. Yamauchi;K. Sakai;T. Nagai;Y. Matsui;M. Karppinen
中科院分区：
文献类型：
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作者：
H. Yamauchi;K. Sakai;T. Nagai;Y. Matsui;M. Karppinen
通式为[MmA 2 Om +2] qCoO 2的错配层状（ML）钴氧化物已被证明是有效的热电材料，因为该结构能够适应高电导率和大热电功率这两个看似矛盾的特性。它们也是其他类似矛盾修饰法功能的潜在宿主。已知的相都含有一个或两个正方形平面MO（M = Co，Bi，Pb，Tl等）。层夹在一起的两个AO（A = Ca，Sr，Ba等）在两个相邻的六方对称的CoO 2层之间的正方形对称平面。在这里，我们报告的实现最简单的（m = 0）ML相形成的Sr-Co-O系统的阳离子比Sr/Co = 1。原子分辨率透射电子显微镜（TEM）成像证实了新相的母体三层晶体结构SrO−SrO− CoO 2，与[Sr 2 O2] qCoO 2的分子式相容。电子衍射结果表明，该相是相当相称的，即“失配参数”q是...
Misfit-layered (ML) cobalt oxides of the general formula of [MmA2Om+2]qCoO2 have been proven to be efficient thermoelectric materials because the structure is capable in accommodating the two seemingly contradictory characteristics of high electrical conductivity and large thermoelectric power. They are also potential hosts for other oxymoron-like functions. The known phases all contain one or two square-planar MO (M = Co, Bi, Pb, Tl, etc.) layers sandwiched together with two AO (A = Ca, Sr, Ba, etc.) planes of square symmetry between two adjacent CoO2 layers of hexagonal symmetry. Here, we report the realization of the simplest (m = 0) ML phase forming in the Sr−Co−O system with the cation ratio Sr/Co = 1. Atomic-resolution transmission electron microscopy (TEM) imaging confirms for the new phase the parent three-layer crystal structure, SrO−SrO−CoO2, which is compatible with the formula of [Sr2O2]qCoO2. Electron diffraction reveals that the phase is rather commensurate, i.e. the “misfit parameter” q is ...