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Impedance characteristics and PTCR effect in lead free BaTi1- xSnxO3 piezoceramics
Lakshmi Kola, Atal Bihari Swain, Martando Rath, ,
Published in Elsevier Ltd
2018
Volume: 106
   
Pages: 371 - 378
Abstract
BaTi1- xSnxO3 of compositions x = 0.07, 0.08, 0.09, 0.10 and 0.11 are synthesized to study their piezoelectric and impedance characteristics. The studies revealed that the composition x = 0.08 exhibits the maximum piezoelectric coefficient (d33 = 296 pC/N) and remnant polarization (Pr = 6.92 μC/cm2) values. The impedance analysis showed that the depressed semi-circular arc observed in the Nyquist's plots gave evidence for the existence of non-Debye type relaxation behavior in the compounds. The impedance studies suggested a possible correlation between the d33 and microstructural properties. The activation energies extracted from ac conductivity plots strongly indicate the existence of defect dipole assisted conductivity mechanism in the samples. Notably, the samples displayed positive temperature coefficient of resistance (PTCR) just above their ferroelectric transition. The frequency dependent ac conductivity follows the Jonscher's universal power law. The dominant conduction mechanism in the samples is determined to be the small polaron hopping mechanism. © 2018 Elsevier Ltd
About the journal
JournalData powered by TypesetMaterials Research Bulletin
PublisherData powered by TypesetElsevier Ltd
ISSN00255408
Open AccessNo
Concepts (15)
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    Activation energy
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    BARIUM COMPOUNDS
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    Electric impedance
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    Piezoelectric ceramics
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    Piezoelectricity
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    TITANIUM COMPOUNDS
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    Ac conductivity
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    IMPEDANCE CHARACTERISTICS
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    Micro-structural properties
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    Piezoelectric
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    Piezoelectric coefficient
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    PTCR
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    Relaxation
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    TEMPERATURE COEFFICIENT OF RESISTANCE
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    Tin compounds