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Effect of CaO-doped in NiMn2O4–LaMnO3 composite ceramics on microstructure and electrical properties

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Abstract

The composite ceramics (NiMn2O4)0.50(La1−x Ca x MnO3)0.50 (0 ≤ x ≤ 0.3) consisting of spinel-structured NiMn2O4 and perovskite-structured CaO-doped LaMnO3 were prepared by classical solid state reaction. The X-ray diffraction (XRD) patterns have shown that the major phases presented in the sintered samples are NiMn2O4 compounds with a spinel structure, La1−x Ca x MnO3 with a perovskite structure. The Scanning Electron Microscope (SEM) pictures have exhibited that the grain size of the composite ceramics decreases from ca. 6.5 to 2.0 μm as the mole fraction of CaO increases from 0 to 0.3. The ρ 25 °C and B 25/50 constants of the composite samples are in the range of 0.234–8.61 Ω cm and 2,600–2,962 K, respectively. In particular, CaO-doped leads to a decrease in the resistance drift of the (NiMn2O4)0.50(La1−x Ca x MnO3)0.50 composite NTC (negative temperature coefficient) ceramics after aging test. This indicates that the CaO-doped (NiMn2O4)0.50(La1−x Ca x MnO3)0.50 NTC ceramics display high electrical stability in comparison with the Ca-free (NiMn2O4)0.50(LaMnO3)0.50 ceramics. The X-ray photoelectron spectroscopy (XPS) analysis verifies that the valence states of the manganese ions have a highly mixed state of Mn2+, Mn3+ and Mn4+ at B site. And the electrical conduction of the composite ceramics can be elaborated by the ions migration mechanism.

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Acknowledgments

The authors are thankful to the National Natural Science Foundation of China (Grant No. 50902148) and the “Western Light Joint Scholar Foundation” Program of Chinese Academy of Sciences (No. RCPY200901) for providing the financial support.

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Authors and Affiliations

  1. Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics and Chemistry, CAS, Urumqi, 830011, People’s Republic of China

    Fang Guan, Huimin Zhang, Aimin Chang, Pengjun Zhao & Bo Zhang

  2. Graduate School of the Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Fang Guan, Pengjun Zhao & Bo Zhang

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  1. Fang Guan
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  2. Huimin Zhang
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  3. Aimin Chang
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  4. Pengjun Zhao
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Correspondence to Aimin Chang.

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Guan, F., Zhang, H., Chang, A. et al. Effect of CaO-doped in NiMn2O4–LaMnO3 composite ceramics on microstructure and electrical properties. J Mater Sci: Mater Electron 23, 1728–1733 (2012). https://doi.org/10.1007/s10854-012-0654-4

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  • DOI: https://doi.org/10.1007/s10854-012-0654-4

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