Role of Tetravalent Ion in Metal–Insulator Transition in (La0.1Ca0.9)(Mn1−xTix)O3
Role of Tetravalent Ion in Metal–Insulator Transition in (La0.1Ca0.9)(Mn1−xTix)O3
复制标题
四价离子在 (La0.1Ca0.9)(Mn1−xTix)O3 金属-绝缘体转变中的作用
DOI：
10.1006/jssc.1996.0334
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发表时间：
1996
影响因子：
5.4
通讯作者：
H. Kido
中科院分区：
文献类型：
--
作者：
H. Taguchi;M. Sonoda;M. Nagao;H. Kido
钙钛矿型（La0.1Ca0.9）（Mn 1 −xTix）O3（0 ≤ × ≤ 0.9）具有正交晶系的GdFeO 3型结构，空间群为Pnma。随着x的增加，（Mn，Ti）-O平均距离线性增加，（Mn，Ti）-O-（Mn，Ti）平均夹角略有减小。在10 ~ 953 K温度范围内测量了所有锰酸盐的电阻率（ρ）。所有的锰酸盐在低温下都是半导体。在高温下，锰氧化物在0 ≤x≤ 0.3范围内表现出金属-绝缘体转变。d ρ/dTin的金属区取决于组成。结果表明，Ti ~（4+）离子使阳离子-阴离子-阳离子重叠积分（Δπ cac和Δσcac）减弱。
Abstract Perovskite-type (La0.1Ca0.9)(Mn1−xTix)O3(0 ≤ × ≤ 0.9) has the orthorhombic GdFeO3-type structure with the space groupPnma. With increasingx, the average (Mn, Ti)–O distance increases linearly and the average angles for (Mn, Ti)–O–(Mn, Ti) decrease slightly. The electrical resistivity (ρ) of all manganates was measured in the temperature range from 10 to 953 K. All manganates aren-type semiconductors at low temperature. At high temperature, the manganates exhibit a metal–insulator transition in the range 0 ≤x≤ 0.3.dρ/dTin the metallic region depends on the composition. From these results, it is considered that the Ti4+ion makes the cation–anion–cation overlap integrals (Δπcacand Δσcac) weaken.