Structure, Magnetoresistance and Electrical Properties of La0.8SrxCa0.2-xMnO3 Compounds

Shao Qun Jiang; Gang Wang; Qi Zhang; Jun Nan Hou; Ze Hua Wang

doi:10.4028/www.scientific.net/AMR.1120-1121.451

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Structure, Magnetoresistance and Electrical...

Structure, Magnetoresistance and Electrical Properties of La_0.8Sr_xCa_0.2-xMnO₃ Compounds

Abstract:

The La_0.8Sr_xCa_0.2-xMnO₃ (x=0, 0.05 and 0.15) compounds were synthesized by combining sol-gel method and high temperature sintering. The effects of Sr doping content on the microstructure, metal-insulator transition and magnetoresistance (MR) of the La_0.8Sr_xCa_0.2-xMnO₃ were investigated. The results show that the La_0.8Sr_xCa_0.2-xMnO₃ exhibit single perovskite phase and the change of Sr doping content can result in phase structure transition. The La_0.8Sr_0.15Ca_0.05MnO₃ is rhombohedra structure and the La_0.8Sr_xCa_0.2-xMnO₃ shows distorted cubic structure when x is no more than 0.05. Increasing Sr doping content causes the degeneration of microstructure homogeneity and density and the decrease of average grain size of the La_0.8Sr_xCa_0.2-xMnO₃, which can be attributed to the weakening of atomic diffusion during the sintering process. The metal-insulator transition temperature (T_MI) of the compounds increases with the decrease of Sr doping content due to the improvement of microstructure. The La_0.8Sr_0.15Ca_0.05MnO₃ has the highest MR peak value, which is about 95%. The La_0.8Ca_0.2MnO₃ has the highest room temperature MR, which is about 28%. Moreover, the magnetoresistance of the La_0.8Ca_0.2MnO₃ is very stable between 125~300K.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

Pages:

451-455

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.451

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Online since:

July 2015

Authors:

Shao Qun Jiang*, Gang Wang, Qi Zhang, Jun Nan Hou, Ze Hua Wang

Keywords:

Doping, La_0.8Sr_xCa_0.2-xMnO₃, Magnetoresistance, Metal-Insulator Transition, Perovskite

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