Evidence of two ferroelectric PTCR components in valence-compensated ceramic system Ba1-xLaxTi1-xCoxO3

Evidence of two ferroelectric PTCR components in valence-compensated ceramic system Ba1-xLaxTi1-xCoxO3

The electrical behaviour of valence-compensated ceramic system Ba1−xLaxTi1−xCoxO3 has been studied as a function of temperature (300–600 K) and composition (x ⩽ 0·20), using the method of impedance spectroscopy. The necessary equivalent circuit models that represent the data best have been obtained...

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Veröffentlicht in:Bulletin of materials science 1997-10, Vol.20 (7), p.933-947
Hauptverfasser: PANDEY, L, KATARE, R. K, PARKASH, O, KUMAR, D
Format: Artikel
Sprache:eng
Schlagworte:
Coefficient of variation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity of specific materials
Dielectric, piezoelectric, ferroelectric and antiferroelectric materials
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electronic transport in condensed matter
Equivalent circuits
Exact sciences and technology
Ferroelectric materials
Ferroelectricity
Grain boundaries
Insulators
Niobates, titanates, tantalates, pzt ceramics, etc
Physics
Positive temperature coefficient
Studies
Temperature
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Zusammenfassung:The electrical behaviour of valence-compensated ceramic system Ba1−xLaxTi1−xCoxO3 has been studied as a function of temperature (300–600 K) and composition (x ⩽ 0·20), using the method of impedance spectroscopy. The necessary equivalent circuit models that represent the data best have been obtained using impedance and modulus formalisms and grain and grain boundary contributions have been separated out. The compositionsx = 0·20 and 0·10 show a negative temperature coefficient of resistance (NTCR) behaviour whereas a very small variation of the grain and grain boundary resistance with temperature is observed forx = 0·05. A positive temperature coefficient of resistance (PTCR) behaviour having two ferroelectric components is observed forx = 0·01. These results reveal limitations in current theories of the PTCR effect.
ISSN:0250-4707
0973-7669
DOI:10.1007/BF02744882