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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Synthesis and low field transport properties in a ZnO-doped La_(0.67)Ca_(0.33)MnO_3 composite
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Synthesis and low field transport properties in a ZnO-doped La_(0.67)Ca_(0.33)MnO_3 composite

机译：ZnO掺杂La_（0.67）Ca_（0.33）MnO_3复合材料的合成及低场输运性能

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摘要

The (1 - x) La_(0.67)Ca_(0.33)MnO_3 (LCMO)+xZnO composites were synthesized by a novel liquid phase method. By using this method, few ZnO was soluble in the La_(0.67)Ca_(0.33)MnO_3 structure and the lattice constant of LCMO almost did not change, while most ZnO was distributed at the grain boundaries. When ZnO content was above 0.20, some ZnO grains aggregated and segregated as the second grain phase. The influences of ZnO on the electrical transport properties of the composites were investigated here. The results indicated that the resistivity of the composites was dominated by the distribution and the connectivity of the grains, not by the grain size. Large low-field magnetoresistance (LFMR) was achieved for the composites. The largest LFMR also appeared when x = 0.20. These may be attributed to the different distribution of ZnO.
机译：采用新型液相法合成了（1-x）La_（0.67）Ca_（0.33）MnO_3（LCMO）+ xZnO复合材料。通过这种方法，几乎​​没有ZnO溶解在La_（0.67）Ca_（0.33）MnO_3结构中，LCMO的晶格常数几乎没有变化，而大多数ZnO分布在晶界。当ZnO含量高于0.20时，一些ZnO晶粒聚集和偏析为第二晶粒相。本文研究了ZnO对复合材料电输运性能的影响。结果表明，复合材料的电阻率主要取决于晶粒的分布和连通性，而不是晶粒尺寸。复合材料实现了大的低场磁阻（LFMR）。当x = 0.20时，最大的LFMR也出现了。这些可以归因于ZnO的不同分布。

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