In-plane impedance spectroscopy in aerosol deposited NiMn_(2)O_(4) negative temperature coefficient thermistor films
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) substrate...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2011 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/44707 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/44707 |
| Access Level: | acceso abierto |
| Palabra clave: | 537 Nickel manganite Electrical-properties Ceramic thermistors NTC thermistors Thin-films Oxide Microstructure. Electricidad Electrónica (Física) 2202.03 Electricidad |
| Sumario: | 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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