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Microstructure and electrical change in CaCu3Ti4O12 induced by Mn doping

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Abstract

Mn-doped CaCu3Ti4O12 ceramics prepared by solid-state reactions have been investigated. XRD patterns show that the main peaks are assigned to the CaCu3Ti4O12 phase with body-centered cubic structure, and the remaining peaks are attributed to the diffraction peaks of secondary phase CaTiO3 and CuO. The diffraction peaks of CuO phase are observed suddenly when x ≥ 0.6. As the Mn content increases, the segregation of Cu-rich boundary phase increases gradually. The electrical properties reveal that as the Mn content increases, the electron hopping between Mn ions is transferred from Mn2+/Mn3+ to Mn3+/Mn4+. The value of resistivity increases at first and then decreases, which should be attributed to the coexistence of CaTiO3, oxygen vacancy, and Cu-rich phase. The values of resistivity (ρ200), material constant (B200/600), and activation energy (Ea) of the negative temperature coefficient (NTC) thermistor ceramics are in the range of 3.55 × 103–1.69 × 106 Ω cm, 3570–6889 K, and 0.308–0.594 eV, respectively.

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Acknowledgements

We acknowledge financial support from the National Natural Science Foundation of China (Grant No. 61871377) and the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2019424).

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Author notes

  1. Zhilong Fu and Xuemei Jia have contributed 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 & Chemistry of CAS, Ürümqi, 830011, China

    Zhilong Fu, Xuemei Jia, Bo Zhang, Qilu Ma & Aimin Chang

  2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhilong Fu & Xuemei Jia

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  1. Zhilong Fu
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  2. Xuemei Jia
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  3. Bo Zhang
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Correspondence to Bo Zhang.

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Fu, Z., Jia, X., Zhang, B. et al. Microstructure and electrical change in CaCu3Ti4O12 induced by Mn doping. J Mater Sci: Mater Electron 32, 604–610 (2021). https://doi.org/10.1007/s10854-020-04842-1

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  • DOI: https://doi.org/10.1007/s10854-020-04842-1

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