Room-temperature TCR and low-field MR of La0.7Ca0.3-xSrxMnO3 polycrystalline ceramics
Room-temperature TCR and low-field MR of La0.7Ca0.3-xSrxMnO3 polycrystalline ceramics
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La0.7Ca0.3-xSrxMnO3多晶陶瓷的室温TCR和低场MR
DOI：
10.1016/j.ceramint.2019.07.135
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发表时间：
2019
影响因子：
5.2
通讯作者：
Xiang Liu
中科院分区：
文献类型：
--
作者：
Gang Dong;Yang Liu;Shuai Zhang;Kaili Chu;Hongjiang Li;Xingrui Pu;Tao Sun;Fuquan Ji;Xiang Liu
In this study, La0.7Ca0.3-xSrxMnO3(LCSMO, 0.06 ≤x≤ 0.1) ceramics were synthesized via a sol-gel method. The perovskite microstructure, electrical transport properties, low-field magnetoresistance (MR) and peak temperature coefficient of resistivity (TCR) behaviors of the as-obtained materials were all studied and the results were discussed. Grain size of LCSMO ceramics expanded as more Sr was added but grain boundaries (GBs) decreased. Field emission scanning electron microscopy (SEM), X-ray photoemission spectroscopy (XPS) and vibrating sample magnetometry (VSM) analyses suggested that addition of Sr greatly enhanced the electrical/magnetic properties of the prepared specimens. The metal-insulator transition temperature rose as doping concentrationxenhanced, and increased Ca2+substitution led to reduced peaks ofMRandTCR. For single-phase LCSMO, large room-temperatureTCRand low-fieldMReffects (0.8 T magnetic field) were obtained by controlling the level of Sr2+substituted Ca2+. Forx= 0.095, the optimized room-temperatureTCRandMRreached 13.78% K−1(299.2 K) and 26.41% (302.6 K), respectively. Overall, LCSMO ceramics have broad application prospects in photoelectronic or magnetic devices at room-temperature.
