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In-plane impedance spectroscopy in aerosol deposited NiMn_(2)O_(4) negative temperature coefficient thermistor films

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Ryu, Jungho and Park, Dong-Soo and Schmidt, Rainer (2011) In-plane impedance spectroscopy in aerosol deposited NiMn_(2)O_(4) negative temperature coefficient thermistor films. Journal of applied physics, 109 (11). ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.3592300


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Abstract

Temperature dependent in-plane impedance spectroscopy measurements were carried out in order to analyze the charge transport properties of functional oxide NiMn_(2)O_(4) negative temperature coefficient thermistor films deposited via aerosol deposition techniques onto glass and Al_(2)O_(3) substrates. The in-plane resistivity (ρ) versus temperature (T) curves of all films were uniform over a large temperature range (180 K to 500 K) and showed the typical exponential power-law behavior associated with variable-range hopping. The ρ-T dependences of annealed and as-deposited films exhibited power-law exponents ρ of about 0.6 and thermistor constants B in the range of 3500 K to 5000 K. As-deposited films showed higher ρ values as compared to annealed films. As-deposited films exhibited also increased B values, leading to increased sensitivity of the resistance to temperature changes, whereas annealed films deposited on Al_(2)O_(3) showed the lowest scatter in differentiated ρ-T data and might display superior reliability for temperature sensing applications.


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© 2011 American Institute of Physics. The authors wish to thank Carlos León and Alberto Rivera for help using the IS equipment, and the Mechanical Workshops at the Facultad de Ciencias Físicas at the Universidad Complutense de Madrid for technical support. J.R. and D.- S.P. were financially supported by a grant from the Fundamental R&D Program for Core Technology of Materials, funded by the Ministry of Knowledge Economy, Republic of Korea. R.S. wishes to acknowledge the Ministerio de Ciencia e Innovación in Spain for granting a Ramón y Cajal Fellowship.

Uncontrolled Keywords:Nickel manganite; Electrical-properties; Ceramic thermistors; NTC thermistors; Thin-films; Oxide; Microstructure.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:32556
Deposited On:28 Jul 2015 10:03
Last Modified:10 Dec 2018 14:58

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