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Colossal permittivity and low losses in Ba1–xSrxTiO3–δ reduced nanoceramics

Dupuis, Sébastien and Sulekar, Soumitra and Kim, Ji Hyun and Han, Hyuksu and Dufour, Pascal and Tenailleau, Christophe and Nino, Juan Claudio and Guillemet-Fritsch, Sophie Colossal permittivity and low losses in Ba1–xSrxTiO3–δ reduced nanoceramics. (2016) Journal of the European Ceramic Society, 36 (3). 567-575. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.10.017

Abstract

The oxalate route offers a controlled approach to synthesize pure Ba1–xSrxTiO3 (BST) (0 ≤ x ≤ 1) nanoparticles (ϕ ≈ 150 nm in diameter). Reduced BST dense nanoceramics were obtained by spark plasma sintering (SPS) and then annealed for a short time to reach colossal permittivity ( = 105) with low dielectric losses (tan δ = 0.03) at 1 kHz and 300 K. The effects of Ba–Sr substitution on structural, microstructural and electrical properties were analyzed. Comprehensive analysis of the electrical properties indicates that polaron hopping, mediated by Ti3+ ions and oxygen vacancies is the main contributing mechanism to colossal permittivity in Ba-rich BST compounds. Substitution of Ba by Sr reduced the contribution of polaron hopping and led to a decrease of real and imaginary parts of permittivity, while preserving interfacial polarization and yielding better temperature stability. The lowest temperature coefficient of capacitance, or TCC (variation of capacitance between 310 K and 450 K) value, i.e., 44 ppm K−1, is obtained for SrTiO3.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at : https://ac.els-cdn.com/S0955221915301801/1-s2.0-S0955221915301801-main.pdf?_tid=885e25a8-f97a-4f96-aac2-b2bbc40455fd&acdnat=1524653522_1125683c46ad1859397f98ab04385e3a
HAL Id:hal-02134637
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 - UPS (FRANCE)
Other partners > University of Florida (USA)
Other partners > Korea Institute of Industrial Technology - KITECH (KOREA)
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Deposited By: cirimat webmestre
Deposited On:25 Apr 2018 13:37

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