RT Journal Article
T1 In-plane impedance spectroscopy in aerosol deposited NiMn_(2)O_(4) negative temperature coefficient thermistor films
A1 Ryu, Jungho
A1 Park, Dong-Soo
A1 Schmidt, Rainer
AB 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.
PB American Institute of Physics
SN 0021-8979
YR 2011
FD 2011-06-01
LK https://hdl.handle.net/20.500.14352/44707
UL https://hdl.handle.net/20.500.14352/44707
LA eng
NO © 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.
NO Fundamental R&D Program for Core Technology of Materials, funded by the Ministry of Knowledge Economy, Republic of Korea
NO Ministerio de Ciencia e Innovación (MICINN)
DS Docta Complutense
RD 24 abr 2025