Effect of La₂O₃ Addition on the Microstructure and Electrical Properties of Copper-Nickel Manganese Thermistors

Abstract:

The effect of La₂O₃ addition on the microstructure and electrical properties of Mn_0.75Ni_1.25CuO_4-xLa₂O₃ (0≤x≤0.3) was studied. The crystal structure, phase compositions and morphology were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The sintered ceramic bodies was typical polycrystalline, with cubic spinel structure of copper manganese oxide, rocksalt structure of nickel copper oxide, along with monoclinic phase of copper oxide and orthorhombic perovskite structure of lanthanum manganese oxide. The obtained ρ_77K, B_77K/90K constant and activation energy of the thermistors were in the range of 3.88-9.29 Ω cm, 245-261 K, and 0.0211–0.0225 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on the La content. So these prepared thermistors were intended to be used under low temperature conditions.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1078-1082
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1078
• Online since: December 2011
• Authors: Jin Cheng Yao, Jun Hua Wang, Qing Zhao, Xia Huang, Ai Min Chang
• Keywords: Copper-Nickel Manganese, Electrical Resistivity, Lanthanum Manganese Oxide, Low-Temperature, Thermistor

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