CuO Modified CaTiO 3 for NTCR Thermistor Application
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00214-y
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CuO Modified C aTiO3 for NTCR Thermistor Application Subhanarayan Sahoo1 Received: 17 March 2019 / Revised: 31 January 2020 / Accepted: 14 February 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract CuO modified CaTiO3 ceramics exhibit logarithmic increase of resistance with decreasing temperature, which makes the compound well suited for use as a negative temperature coefficients resistance thermistor material in temperature sensing device applications. The source powder production, the experimental set-up, the process parameters and the resulting properties for each are presented and compared. Ca1−XCuXTiO3 (0.1, 0.3, 0.5 and 0.7) synthesized by High Energy Ball Mill. The phase purity of the source powder and the films was assessed by X-ray diffraction. The electrical properties were analysed by measuring the resistance–temperature characteristics. Steinhart and Hart model and time response analysis used for the verification and potential towards the thermistor industry. Experimental result shows potential of all samples in thermistor industry because of exponential electrical resistance with temperature. Time response analysis revels materials response potential to temperature also variation of response time due to effect of doping concentration variation. The sensitivity (β value found to be in the range of 4482–8001 K which is comparable to other potential thermistor industry material already in use. The aim of this experiment to introduce new thermistor material with matching electrical parameters. Keywords Electrical resistance · NTCR thermistor · Sensitivity · Time response
1 Introduction As per literature review CuO modified CaTiO3 till now mostly used in optical [1] application. Also some research paper available with dielectric properties [2, 3].No one report about the thermistor behavior of the same till now [4]. So it motivates the research of Thermistor property. So attempts are taken to justify CuO modified C aTiO3 as Thermistor ceramic material of industrial importance. Also these materials are environment friendly. This research performed as an attempt to introduce a new material for the thermistor material family used in thermistor industry. Thermally sensitive resistors are known as Thermistors. Over a temperature span of ~ 100 °C several semi-conducting oxide ceramics exhibit large changes in resistivity. The resistance falls as temperature increases in most such materials. In Thermistor Industry these are known as negative temperature coefficient (NTC) thermistors. NTC thermistors are used in a variety of other control circuitry and temperature * Subhanarayan Sahoo [email protected] 1
Department of Electrical Engineering, Adani Institute of Infrastructure Engineering, Ahmedabad, India
sensors. It has very high market value captured as electrical and electronic component industry [5]. The electron hopping mechanism is a thermally
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