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Effects of Zn-doping on the electrical properties of ZnxFe2.5−xNi2Mn1.5O8 (0≤ x ≤ 0.8) NTC ceramics by co-precipitation method

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Abstract

The ZnxFe2.5-xNi2Mn1.5O8(0 ≤ x ≤ 0.8) ceramics with different compositions were synthesized by co-precipitation method. The effects of Zn doping on the structure, electrical properties and stability of the ceramic samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), electrical measurement and X-ray photoelectron spectroscopy (XPS) analysis. It was found that, as the Zn doping content in the ZnxFe2.5-xNi2Mn1.5O8 samples increased, both the grain size and the density decreased. The XPS analysis confirmed the conduction of as-sintered ceramic structure was mainly due to hopping of electrons between Mn3+/Mn4+ and Fe2+/Fe3+ ions. The values of B 25/50 constant, ρ 25 and E a of ZnxFe2.5-xNi2Mn1.5O8 ceramic samples were in the range of 5375–4177 K, 9042–18 KΩ•cm and 0.464–0.360 eV, respectively. The values of relative resistance drift (ΔR/R 0 ) were in the range of 0.58–2.78% and had a minimum value with the Zn content of x = 0.2 after aging test at 125 °C for 500 h. This suggests that the electrical properties of ZnxFe2.5-xNi2Mn1.5O8 ceramic system can be adjusted to desired values by controlling the Zn ion doping content. Besides, the stability of Mn-Ni-Fe-O ceramic can be effectively improved by Zn doping.

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Acknowledgements

Autonomous Region Youth Science and technology innovation personnel training project (No. QN2015JQ010).

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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 & Chemistry of CAS, Urumqi, 830011, China

    Xianxian Xie, Mingxing Chen, Ting Liu, Hui Jiang, Huimin Zhang & Aiming Chang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Xianxian Xie, Mingxing Chen & Ting Liu

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  1. Xianxian Xie
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  2. Mingxing Chen
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  3. Ting Liu
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  4. Hui Jiang
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  5. Huimin Zhang
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  6. Aiming Chang
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Correspondence to Huimin Zhang or Aiming Chang.

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Xie, X., Chen, M., Liu, T. et al. Effects of Zn-doping on the electrical properties of ZnxFe2.5−xNi2Mn1.5O8 (0≤ x ≤ 0.8) NTC ceramics by co-precipitation method. J Mater Sci: Mater Electron 28, 8655–8661 (2017). https://doi.org/10.1007/s10854-017-6589-z

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  • DOI: https://doi.org/10.1007/s10854-017-6589-z

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