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The Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) based negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure, and electrical properties. The lattice parameter and relative density increase with the increase of Sr content. A small amount of Sr restrains the grain growth and increases the bulk density. Moreover, the room resistivity ρ25, material constant B25/50, activation energy Ea, and temperature coefficient α values of MCNS ceramics are influenced by the Sr content and ranged in 1535.0-2053.6 Ω·cm, 3654-3709 K, 0.3149-0.3197 eV, and (-4.173%)-(-4.111%), respectively. The X-ray photoelectron spectroscopy (XPS) results explain the transformation of MCNS ceramics from n- to p-type semiconductors. The conduction could arise from the hopping polaron between Mn3+/Mn4+ and Co2+/Co3+ in the octahedral sites. The impedance data analysis also discusses the conduction mechanism of the MCNS ceramic, whereas grain resistance dominates the whole resistance of the samples. Furthermore, the aging coefficient (ΔR/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with < 1.3% of resistance shift after100 thermal shock cycles.


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Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Show Author's information Haibing LIa,b,cHuimin ZHANGa( )Slapley THAYILcAimin CHANGa( )Xu SANGa,bXiuhua MAa,b
Key Laboratory of Functional Materials and Devices for Special Environments of Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of Chinese Academy of Sciences, Urumqi 830011, China
University of the Chinese Academy of Sciences, Beijing 100049, China
Xinjiang Research Institute of Measurement & Testing, Urumqi 830011, China

Abstract

The Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) based negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure, and electrical properties. The lattice parameter and relative density increase with the increase of Sr content. A small amount of Sr restrains the grain growth and increases the bulk density. Moreover, the room resistivity ρ25, material constant B25/50, activation energy Ea, and temperature coefficient α values of MCNS ceramics are influenced by the Sr content and ranged in 1535.0-2053.6 Ω·cm, 3654-3709 K, 0.3149-0.3197 eV, and (-4.173%)-(-4.111%), respectively. The X-ray photoelectron spectroscopy (XPS) results explain the transformation of MCNS ceramics from n- to p-type semiconductors. The conduction could arise from the hopping polaron between Mn3+/Mn4+ and Co2+/Co3+ in the octahedral sites. The impedance data analysis also discusses the conduction mechanism of the MCNS ceramic, whereas grain resistance dominates the whole resistance of the samples. Furthermore, the aging coefficient (ΔR/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with < 1.3% of resistance shift after100 thermal shock cycles.

Keywords:

Sr-doped Mn-Co-Ni-O materials, negative temperature coefficient (NTC) ceramics, electrical properties, thermal shock cycling
Received: 15 April 2020 Revised: 13 October 2020 Accepted: 09 November 2020 Published: 27 February 2021 Issue date: April 2021
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Publication history

Received: 15 April 2020
Revised: 13 October 2020
Accepted: 09 November 2020
Published: 27 February 2021
Issue date: April 2021

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© The Author(s) 2020

Acknowledgements

This study was supported by Xinjiang Key Laboratory of Electronic Information Materials and Devices Foundation (Grant No. 2018D04006), Tianshan Cedar Project of Xinjiang Uygur Autonomous Region (Grant No. 2018XS09), and the National Natural Science Foundation of China (Grant No. 51872326).

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