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12-05-2016 | Original Paper

Internal barrier layer capacitor, nearest neighbor hopping, and variable range hopping conduction in Ba_1−xSr_xTiO_3−δ nanoceramics

Authors: Soumitra Sulekar, Ji Hyun Kim, Hyuksu Han, Pascal Dufour, Christophe Tenailleau, Juan Claudio Nino, Eloisa Cordoncillo, Hector Beltran-Mir, Sébastien Dupuis, Sophie Guillemet-Fritsch

Published in: Journal of Materials Science | Issue 16/2016

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Abstract

The dielectric properties of the solid solution Ba_1−xSr_xTiO_3−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.

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Title: Internal barrier layer capacitor, nearest neighbor hopping, and variable range hopping conduction in Ba1−x Sr x TiO3−δ nanoceramics
Authors: Soumitra Sulekar
Ji Hyun Kim
Hyuksu Han
Pascal Dufour
Christophe Tenailleau
Juan Claudio Nino
Eloisa Cordoncillo
Hector Beltran-Mir
Sébastien Dupuis
Sophie Guillemet-Fritsch
Publication date: 12-05-2016
Publisher: Springer US
Published in: Journal of Materials Science / Issue 16/2016
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-016-0019-0

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