Synthesis, magnetism, and electrical properties of La1-xBaxTiO3 (0.0≤x≤0.5)
Synthesis, magnetism, and electrical properties of La1-xBaxTiO3 (0.0≤x≤0.5)
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DOI：
10.1021/cm00034a026
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发表时间：
1993-10
影响因子：
8.6
通讯作者：
J. E. Sunstrom;S. Kauzlarich
中科院分区：
文献类型：
--
作者：
J. E. Sunstrom;S. Kauzlarich
The study of cation substitution in transition-metal oxides provides fundamental information needed to understand such phenomena as high-Tc superconductivity and magnetic order in oxide materials. The solid solution Lai_xBaxTi03 (0.0< x< 0.5) has been prepared by arc melting stoichiometric amounts of LaTiC> 3 and BaTiC> 3 under argon. Single-phasesamples can be made for the stoichiometry range studied here. The polycrystalline samples have been characterized using electron microprobe, thermal gravimetric analysis, temperature-and fielddependent magnetization, and dc resistivity. The stoichiometries determined by microprobe agree well with the theoretical stoichiometries. LaTi03 is a canted antiferromagnet which shows a net ferromagnetic ordering at 150 K. The ferromagnetic order is destroyed with the addition of 5% BaTi03. All of the Lai_xBaxTi03 (x> 0) samples exhibit temperature-independent magnetism in the high-temperature (160-300 K) range and paramagnetism in the low temperature (< 50 K) region. The Lai_xBaxTi03samples display poor metallic conductivity. In addition, several random samples display a sharp drop in resistivity which is reminiscent of PTCR thermistor behavior.
