Rare Earth and Perovskite Composite Ceramics Applied for the Thermistor with Wide Temperature Range

Bo Zhang; Qing Zhao; Ai Min Chang; Peng Jun Zhao; Fang Guan

doi:10.4028/www.scientific.net/KEM.512-515.613

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Rare Earth and Perovskite Composite Ceramics...

Rare Earth and Perovskite Composite Ceramics Applied for the Thermistor with Wide Temperature Range

Abstract:

Different compositions (aY₂O₃+bCeO₂)-0.4YCr_0.5Mn_0.5O₃ (a+b=0.6) were prepared via a conventional solid-state reaction at 1200°C, and sintered under air atmosphere at 1600°C. XRD patterns analysis has revealed that for 0<a<0.6, the major phases present in the calcined bodies are Y₂O₃, CeO₂ and orthorhombic perovskite YCr_0.5Mn_0.5O₃ phase, respectively. SEM and EDAX observations confirm the obtaining of three-phased composite ceramics. The brighter regions are the Y₂O₃and CeO₂ phase, whereas the darker are perovskite phase. All the NTC thermistors prepared show a similar linear relationship between the ln of the resistance and the reciprocal of the absolute temperature, indicative of NTC characteristics. For 0≤a≤0.6, the plotting curves of resistance- temperature characteristic are none linear on the wide temperature range, exhibit two branches. The obtained B_25/150 and B_700/1000 constants of the thermistors are in the range 3600-4400K and 6700-12000K. The magnitude order of the resistivity at 25°C is of 10⁶-10⁷Ωcm and activation energies vary from 0.313 to 1.029 eV at low and high temperatures, respectively. These compounds, having good NTC characteristics in a wide range of temperatures, could be applied as potential candidates for NTC thermistors from ambient to 1100°C.

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Key Engineering Materials (Volumes 512-515)

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613-616

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https://doi.org/10.4028/www.scientific.net/KEM.512-515.613

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June 2012

Authors:

Bo Zhang, Qing Zhao, Ai Min Chang, Peng Jun Zhao, Fang Guan

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NTC Thermistors, Wide Temperature Range, Y₂O₃

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