Raman scattering study and electrical properties characterization of elpasolite perovskites Ln2(BB′)O6 (Ln = La, Sm... Gd and B,B′= Ni, Co, Mn)
Raman scattering study and electrical properties characterization of elpasolite perovskites Ln2(BB′)O6 (Ln = La, Sm... Gd and B,B′= Ni, Co, Mn)
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DOI：
10.1016/j.jssc.2004.02.022
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发表时间：
2004-07-01
影响因子：
3.3
通讯作者：
McMillan, PF
中科院分区：
文献类型：
--
作者：
Bull, CL;McMillan, PF
合成了两个系列的钙钛矿型钙钛矿化合物Ln（2）CoMnO（6）和Ln（2）NiMnO（6）（Ln = La，Pr，Nd，Sm，Gd）。的电子带隙和磁居里温度系统地变化的稀土阳离子的大小的函数在这两个系列。在这里，我们使用拉曼散射光谱沿着与以前的结构研究的结果表明，有八面体畸变的变化不大，但显着的变化，八面体倾斜角后，降低镧系离子半径。这些数据表明两个系列材料之间的轨道重叠和键强度的差异，使我们能够了解两个钙钛矿系列内部和之间的磁性和电学性质的变化。(C)2004年爱思唯尔公司All rights reserved.
Two series of elpasolite perovskites Ln(2)CoMnO(6) and Ln(2)NiMnO(6) (Ln = La, Pr, Nd, Sm, Gd) have been prepared. The electronic band gap and magnetic Curie temperature vary systematically as a function of the rare earth cation size within both series. Here we used Raman scattering spectroscopy along with the results of previous structural studies to show that there is little change in octahedral distortion but significant changes in the octahedral tilting angle upon decreasing lanthanide ionic radius. The data indicate differences in the orbital overlap and bond strengths between the two series of materials that allow us to understand variations in the magnetic and electrical properties within and between the two perovskite series. (C) 2004 Elsevier Inc. All rights reserved.