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Internal barrier layer capacitor, nearest neighbor hopping, and variable range hopping conduction in Ba1−x Sr x TiO3−δ nanoceramics

Sulekar, Soumitra and Kim, Ji Hyun and Han, Hyuksu and Dufour, Pascal and Tenailleau, Christophe and Nino, Juan Claudio and Cordoncillo, Eloisa and Beltran-Mir, Hector and Dupuis, Sébastien and Guillemet, Sophie Internal barrier layer capacitor, nearest neighbor hopping, and variable range hopping conduction in Ba1−x Sr x TiO3−δ nanoceramics. (2016) Journal of Materials Science, 51 (16). 7440-7450. ISSN 0022-2461

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Official URL: https://doi.org/10.1007/s10853-016-0019-0

Abstract

The dielectric properties of the solid solution Ba1−x Sr x TiO3−δ (0 ≤ x ≤ 1) have been investigated. The nanopowders were prepared via a coprecipitation reaction followed by a calcination treatment. Spark plasma sintering allowed to obtain dense nanocrystalline ceramics. Broadband impedance spectroscopy revealed colossal permittivity (ε′ = 105) associated with low losses (tan δ = 0.03) in the most favorable case. The bulk conductivity data was analyzed using Jonscher’s universal dielectric response model. In the Ba-rich compound, conduction process followed variable range hopping conduction model while the Sr-rich BST compound showed the nearest neighbor hopping conduction mechanism associated with displacements of space charges. These two different conduction mechanisms might be able to explain superior temperature–frequency-independent dielectric properties in Sr-rich BST compound compared to Ba-rich BST compound.

Item Type:Article
HAL Id:hal-02429192
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Florida (USA)
Other partners > Korea Institute of Industrial Technology - KITECH (KOREA)
Other partners > Universitat Jaume I (SPAIN)
Laboratory name:
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Deposited By: Yves MOMBOISSE
Deposited On:06 Jan 2020 13:51

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