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Preparation routes and electrical properties for Ni0.6Mn2.4O4 NTC ceramics

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Abstract

Ni0.6Mn2.4O4 negative temperature coefficient ceramics were prepared by using solid-state coordination reaction and traditional solid-state methods, their structures and properties were characterized by using scanning electron microscopy, powder X-ray diffractometer and temperature dependent resistivity test. For solid-state reaction powders, the calcination temperature necessary for formation of the spinel phase was 1000 °C, which is 300 °C higher than that of solid-state coordination reaction powders. Regardless of preparation routes, the ceramics were crystallized in a single cubic spinel structure when the sintering temperature was lower than or equal to 1150 °C, Mn3O4 impurity phase was detected when the sintering temperature raised to 1200 °C. Having higher densities and bigger grain sizes, the solid-state coordination reaction samples had smaller room temperature resistivities and larger B 25/50 values as compared with those of solid-state samples.

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Acknowledgments

This work was supported by Major Program for the Natural Scientific Research of Jiangsu Higher Education Institutions (12KJA430002) and Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), IRT1146. And the authors acknowledge the financial support from Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.

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  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, China

    Chengjian Ma, Yunfei Liu & Yinong Lu

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  1. Chengjian Ma
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  2. Yunfei Liu
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  3. Yinong Lu
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Correspondence to Yunfei Liu or Yinong Lu.

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Ma, C., Liu, Y. & Lu, Y. Preparation routes and electrical properties for Ni0.6Mn2.4O4 NTC ceramics. J Mater Sci: Mater Electron 26, 7238–7243 (2015). https://doi.org/10.1007/s10854-015-3350-3

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  • DOI: https://doi.org/10.1007/s10854-015-3350-3

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