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Descripción
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| Abstract The recent observation of a giant dielectric constant in calcium copper titanate, CCTO, has led to considerable efforts aimed to understanding the origin of this behaviour. In addition to this phenomenon strong non-linear I-V response has been reported. The high frequency dielectric constant of about 104-105, is practically frequency independent between dc and 106 Hz and possesses good temperature stability over a range from 100 to 400 K. Nevertheless, the relatively high dissipation factor in CCTO is not desirable for practical applications. The dielectric properties of CCTO can be explained in terms of a capacitive-layer model, as for an inhomogeneous semiconductor, consisting of semi conducting grains and insulating grain boundaries. The aim of this work is to study the effect of the temperature on the dielectric properties of Fe-doped CCTO. Different Fe3+ doping amounts were incorporated to study the dielectric response of the material. XRD and FESEM analysis, impedance spectroscopy and dielectric properties curves, in a range of frequencies from 10-3 Hz to 40 MHz and temperatures from 77 K to 298 K, were afforded to correlate the microstructure and the electrical properties. Notes | |
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Internacional
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Si |
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Nombre congreso
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EC07-ELECTROCERAMICS |
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Tipo de participación
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960 |
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Lugar del congreso
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AVEIRO (PORTUGAL) |
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Revisores
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No |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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24/06/2007 |
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Fecha fin congreso
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26/06/2007 |
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