Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (1): 85-90.DOI: 10.3724/SP.J.1077.2014.13171

• Research Paper • Previous Articles     Next Articles

Preparation and Electrical Properties of (LaMn0.8Al0.2O3)1-x(Al2O3)x(0.05≤x≤0.2) NTC Ceramics

ZHAO Li-Jun1,2,3,4, ZHANG Hui-Min1,2,3, CHANG Ai-Min1,2,3, ZHAO Peng-Jun1,2,3,4, ZHANG Bo1,2,3,4, ZHANG Bing-Yin1,2,3,4   

  1. (1. Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China; 2. Key Laboratory of Functional Materials and Devices under Special Environments, Chinese Academy of sciences, Urumqi 830011, China; 3. Xinjiang Key Laboratory of Electronic Information Materials and Devices, Urumqi 830011, China; 4. University of Chinese Academy of Sciences, Bejing 100049, China)
  • Received:2013-03-25 Revised:2013-04-22 Published:2014-01-20 Online:2013-12-09
  • About author:ZHAO Li-Jun. E-mail: shuishangfuping2008@126.com
  • Supported by:

    National Natural Science Foundation of China (50902148); “Western Light Foundation”Program of Chinese Academy of Sciences(RCPY200901); Science and Technology Program of Xinjiang Uygur Autonomous Region (201116147)

Abstract: (LaMn0.8Al0.2O3)1-x(Al2O3)x (0.05≤x≤0.2) negative temperature coefficient (NTC) ceramics were synthesized through a standard solid-state method. Thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscope (EDS), resistance-temperature measurement and aging test were carried out to characterize the optimal calcined temperature, phase structure, morphology, elements concentration, R-T properties and electrical stability, respectively. The results show that the electrical resistivity of the ceramic samples increases remarkably as Al2O3 content increasing, while the constant B value has just little change. Specially, the ceramics exhibit superior properties of low B value (2816.44 K) and high resistivity (11893.89 Ω?cm) when x=0.15. In addition, the resistance variation (ΔR/R) of samples is less than 0.94% after aging at 125℃ for 500 h.

Key words: (LaMn0.8Al0.2O3)1-x(Al2O3)x, NTC thermistor ceramics, electrical properties

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