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Título:
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ac hopping admittance in spinel manganate negative temperature coefficient thermistor electroceramics
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Autores:
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Schmidt, Rainer ;
Brinkman, Andrew W.
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Tipo de documento:
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texto impreso
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Editorial:
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American Institute of Physics, 2008-06-01
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Electricidad
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Materia = Ciencias: Física: Electrónica
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Tipo = Artículo
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Resumen:
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In this work, the ac admittance of a thick film nickel manganate spinel negative temperature coefficient thermistor ceramic system containing a glass phase is investigated. The dominating relaxation process is a grain boundary (GB) effect and has been investigated comprehensively. We present double-logarithmic plots of the specific admittance ?' vs ? and (?'/?_(dc)) vs ?, and specific impedance z vs ?z"/? and [(?_(dc)/z')?1] vs ?, in order to characterize GB charge transport. Using the complex admittance notation (?*), an unusually low Jonscher exponent of frequency ~0.007 was obtained and the GB relaxation displayed close to ideal behavior.
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En línea:
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https://eprints.ucm.es/33088/1/Schmidt08.libre.pdf
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