【摘 要】
：
Polycrystalline La0.67Ba0.33MnO3 bulk samples were annealed in flowing 95%Ar:5%H2 (AH) mixed gas at 973 K for different time respectively. The influence of the
【机 构】
：
Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) and Depart
【出 处】
：
Journal of Rare Earths
论文部分内容阅读
Polycrystalline La0.67Ba0.33MnO3 bulk samples were annealed in flowing 95%Ar:5%H2 (AH) mixed gas at 973 K for different time respectively. The influence of the annealing time on the current-voltage properties was systematically investigated. Linear current-voltage characteristics were observed in the as-prepared and the 10 h annealed samples, and nonlinear current-voltage characteristics was found in the 100 h annealed sample. At the same time, segregation of impurity phase and micro-cracks were found on the surfaces of the 100 h annealed samples, which was testified to be Ba ion impurity. Analysis showed that the changes of electronic properties were caused by barium ion im-purities and micro-cracks in the 100 h annealed sample.
The influence of the annealing time on the current-voltage properties was systematically investigated. Polycrystalline La0.67Ba0.33MnO3 bulk samples were annealed in flowing 95% Ar: 5% H2 (AH) mixed gas at 973 K for different time respectively. -voltage characteristics were observed in the as-prepared and the 10 h annealed samples, and the nonlinear current-voltage characteristics was found in the 100 h annealed samples. At the same time, segregation of the impurity phase and micro-cracks were found on the surfaces of the 100 h annealed samples, which was testified to be Ba ion impurity. It shows the changes of electronic properties were caused by barium ion im-purities and micro-cracks in the 100 h annealed samples.
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