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Effect of A (A = Li, Na, K) doping on structure and electrical properties of Mn1.2Ni0.3Co1.5O4 polycrystalline ceramics

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Abstract

In this study, the alkali metal (Li/Na/K) doping has been achieved by using the sol–gel method, and the thermally sensitive ceramic Mn1.2Ni0.3Co1.5−x (Li/Na/K)xO4 has been subsequently obtained by the traditional solid-phase sintering and two-step sintering methods. XRD results revealed that the doping of Li/Na/K did not introduce any impurity phases other than the cubic spinel phase of MnCo2O4. The SEM analysis demonstrated that the doping of Li enhanced the grain size, whereas the Na and K doping decreased the grain size from 3.98 μm and 3.23 μm to 3.58 μm and 2.71 μm. In addition, the grain size of the ceramic samples sintered in the second step was noted to be relatively uniform. For the Li-doped samples, the resistivity of the traditional and two-step sintered thermal ceramic samples exhibited an increasing trend from 6.17 μm and 6.5 μm to 12.72 μm and 7.88 μm. The alkali metal (Li/Na/K) doping reduced the resistivity of the Mn1.2Ni0.3Co1.5−xAXO4 (A = Li, Na, K) thermal ceramics. The findings reported in this study confirm that the Mn1.2Ni0.3Co1.5−x (Li/Na/K)xO4 family exhibits a high potential of as the low-temperature NTC heat-sensitive materials. The alkali-metal-doped manganese-based ceramics are traditionally thermally sensitive materials with high resistance and high B, while low B high-resistance materials have rarely been reported.

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Acknowledgements

The authors acknowledge the financial support of the key R & D project of China Xinjiang Uygur Autonomous Region (Grant No. 2021B01001-4).

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  1. Yifeng Zhao and Wenye Deng contribute equally to this work.

Authors and Affiliations

  1. Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics and Chemistry of CAS, Urumqi, China

    Yifeng Zhao, Xianghui Chen, Huimin Zhang, Aimin Chang & Yongxin Xie

  2. School of Chemical and Environmental Engineering, Xinjiang Institute of Engineering, Xinjiang, 830091, China

    Wenye Deng

  3. Zhongke Sensing (Foshan) Technology Co., Ltd., Foshan, Guangdong, China

    Yongxin Xie

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  1. Yifeng Zhao
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  2. Wenye Deng
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  4. Huimin Zhang
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Correspondence to Aimin Chang or Yongxin Xie.

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Zhao, Y., Deng, W., Chen, X. et al. Effect of A (A = Li, Na, K) doping on structure and electrical properties of Mn1.2Ni0.3Co1.5O4 polycrystalline ceramics. J Mater Sci: Mater Electron 33, 22448–22455 (2022). https://doi.org/10.1007/s10854-022-09021-y

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