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Preparation and characterization of Ni0.6CoxMn2.4−xO4 (0.2 ≤ x ≤ 1.4) NTC ceramics with low resistivity and high B value

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Abstract

The effects of Co content on the phase structure, micromorphology and electrical performance of Ni0.6CoxMn2.4−xO4 ceramics were studied using transmission electron microscope (TEM), X-ray powder diffractometer (XRD), scanning electron microscope (SEM), energy-dispersive spectrometer (EDS) and resistance/temperature measurements. TEM and high angle annular dark field (HAADF)-mapping results show that the calcined powders were nano-sized and the elements were uniformly distributed. For x < 0.98, the ceramics exhibited single cubic spinel structure. Our SEM–EDS results confirm that a rock-salt phase (Ni,Co)O is formed when 0.98 ≤ x ≤ 1.4. The lattice parameter of the spinel phase decreases with increasing Co content. The room-temperature resistivity of the ceramics decreases from 1100 to 219 Ω cm and then increased to 325 Ω cm as Co was added, while the B value decreased slightly from 3588 to 3030 K. The Ni0.6CoxMn2.4−xO4 ceramics are promising negative temperature coefficient materials for temperature monitoring in electric vehicles owing to their low resistivity and high B values.

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Acknowledgements

This work was supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 19KJB430039), Joint Project of Industry-University-Research of Jiangsu Province (No. BY2019202), Talent Introduction Project of Yancheng Institute of Technology (XJ201735) and Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipments and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (JH201842).

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Authors and Affiliations

  1. Analytical and Testing Center, Yancheng Institute of Technology, Yancheng, 224051, China

    Chengjian Ma

  2. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, 224051, China

    Chengjian Ma

  3. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, 85287, USA

    Xiahui Chen

  4. School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, China

    Guoge Lu & Yu Zhang

  5. Department of Physics, Yancheng Institute of Technology, Yancheng, 224051, China

    Hong Gao

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  1. Chengjian Ma
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  2. Xiahui Chen
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  3. Guoge Lu
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  4. Yu Zhang
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  5. Hong Gao
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Correspondence to Chengjian Ma or Hong Gao.

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Ma, C., Chen, X., Lu, G. et al. Preparation and characterization of Ni0.6CoxMn2.4−xO4 (0.2 ≤ x ≤ 1.4) NTC ceramics with low resistivity and high B value. J Mater Sci: Mater Electron 31, 15345–15351 (2020). https://doi.org/10.1007/s10854-020-04098-9

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  • DOI: https://doi.org/10.1007/s10854-020-04098-9

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