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Research Article | Open Access

CaTiO3 nano ceramic for NTCR thermistor based sensor application

Subhanarayan SAHOOa,b( ), S. K. S. PARASHARc, S. M. ALIa
School of Electrical Engineering, KIIT University, Bhubaneswar-751024, India
Department of Electrical and Electronics Engineering, Trident Academy of Technology, Bhubaneswar-751024, India
School of Applied Sciences, KIIT University, Bhubaneswar-751024, India
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Abstract

It is possible to fabricate highly sensitive NTCR (negative temperature coefficient of resistance) thermistor using nano crystalline CaTiO3 synthesized by high energy ball milling. Disc shaped green pellets were prepared and effects of sintering on the disc pellets were studied as thermistor by sintering the samples at 1000 ℃, 1100 ℃ and 1200 ℃. The as-prepared samples were characterized by X-ray diffraction (XRD), impedance analysis and electrical measurement. The resistivity of the prepared samples varies predictably with temperature: this makes them promising material for temperature sensor. The experimental results prove that nano crystalline CaTiO3 ceramic is one kind of thermistor with exponential negative temperature coefficient of resistance in the temperature range of 300–500 ℃. The samples have the advantages of rapid response, high sensitivity and capability to withstand thermal surges over the temperature range of 300–500 ℃. Resistance–temperature characteristics are described by thermistor equation with thermistor constant around 4003 K to 10795 K and thermal coefficient of resistance α around -1%/℃ to -13%/℃. The activation energy is in the range of 0.34–0.93 eV. The observed thermistor parameters are found to be comparable with many of the known thermistor materials. This suggests that the electrical properties can be adjusted to desirable values by controlling the temperature parameter. The influence of fabrication process of disc thermistor and electrical properties are discussed. The study shows the potential of nano crystalline CaTiO3 to act as an NTCR material for thermistor applications.

Keywords

CaTiO3thermistorsensitivity indextemperature coefficient

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Journal of Advanced Ceramics
Volume 3 Issue 2,
June 2014
Pages 117-124
DOI: 10.1007/s40145-014-0100-6
Cite this article:
SAHOO S, PARASHAR SKS, ALI SM. CaTiO3 nano ceramic for NTCR thermistor based sensor application. Journal of Advanced Ceramics, 2014, 3(2): 117-124. https://doi.org/10.1007/s40145-014-0100-6

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Received: 28 November 2013
Revised: 27 February 2014
Accepted: 13 March 2014
Published: 01 June 2014
© The author(s) 2014

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
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