2026-06-28T10:12:02Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/516112023-08-26T07:06:14Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Schmidt, Rainer
2023-06-20T11:01:29Z
2023-06-20T11:01:29Z
2007-11-05
1616-301X
10.1002/adfm.200600878
https://hdl.handle.net/20.500.14352/51611
http://dx.doi.org/10.1002/adfm.200600878
http://onlinelibrary.wiley.com
The charge transport mechanism and the macroscopic dielectric constant in polycrystalline device materials commonly exhibit several components such as electrode-sample interface, grain boundary and bulk contributions. In order to gain precise understanding of the functionality of polycrystalline electroceramic device materials it is essential to deconvolute these contributions. The paradigm of functional NTC thermistor ceramics based on thick film spinel manganates has been studied by temperature dependent alternating current impedance spectroscopy. Three typical relaxation phenomena were detected, which all showed a separated temperature dependence of resistivity consistent with thermally activated charge transport. The dominating grain boundary and the interface contributions exhibited distinctively different capacitance allowing clear identification. The composite nature of the dielectric properties in polycrystalline functional ceramics was emphasized, and impedance spectroscopy was shown to be a powerful tool to account for and model such behavior.
eng
Studies of the temperature and frequency dependent impedance of an electroceramic functional oxide NTC thermistor
journal article
URL
https://docta.ucm.es/bitstreams/083ffdda-d0bc-44fd-a4aa-957f5e10d5da/download
File
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Schmidt13 preprint.pdf
URL
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6cc1908d23503d4cd676facf2558269b
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text/plain
Schmidt13 preprint.pdf.txt