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Extended semiconducting behaviour of \(\hbox {Ba}_{0.85}\hbox {Sr}_{0.15}\hbox {Ti}_{0.9}\hbox {Fe}_{0.1}\hbox {O}_3\) thick films in large temperature range

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Abstract

\(\hbox {Ba}_{0.85}\hbox {Sr}_{0.15}\hbox {Ti}_{0.9}\hbox {Fe}_{0.1}\hbox {O}_{3}\) (BSTF) powder has been synthesized by solid-state reaction in aim to develop lead-free semiconductor gas sensors. Thick BSTF films were therefore deposited on alumina substrates coated by silver–palladium (Ag–Pd) bottom electrodes and then sintered at 1100 °C for 2 h. These films were physically and electrically characterized. The dielectric constant, loss tangent and conductivity evolutions were investigated in extended frequency and temperature ranges and compared to results given by a non doped barium titanate thick film. A huge increase of the BSTF conductivity variation, by a factor of 10,000 at low frequency when the temperature ranges from 25 to 500 °C, was observed. This behaviour, associated to a relaxation mechanism governed by the migration of oxygen vacancies, has led to a drastic change of the BSTF conductivity.

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Acknowledgments

Francis Gouttefangeas is acknowledged for SEM images performed at CMEBA (ScanMAT, University of Rennes 1) which received a financial support from the European Union (CPER-FEDER, 2007–2014).

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Authors and Affiliations

  1. Unité de Dynamique et Structure des Matériaux Moléculaires (UDSMM), Université du Littoral Côte d’Opale (ULCO), BP717, 62228, Calais, France

    M. A. El Romeh, D. Fasquelle & M. Mascot

  2. Institut des Sciences Chimiques de Rennes (ISCR), UMR CNRS 6226, Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France

    S. Députier & M. Guilloux-Viry

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  1. M. A. El Romeh
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  2. D. Fasquelle
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  3. S. Députier
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  4. M. Mascot
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  5. M. Guilloux-Viry
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Correspondence to M. A. El Romeh.

Additional information

This study, occurring within the French research project titled OSPEGAZ (ANR 11 ECOT 01201, 2012–2015), is funded by the French Agency of Research (ANR Agence Nationale de la Recherche).

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El Romeh, M.A., Fasquelle, D., Députier, S. et al. Extended semiconducting behaviour of \(\hbox {Ba}_{0.85}\hbox {Sr}_{0.15}\hbox {Ti}_{0.9}\hbox {Fe}_{0.1}\hbox {O}_3\) thick films in large temperature range. J Mater Sci: Mater Electron 27, 2096–2102 (2016). https://doi.org/10.1007/s10854-015-3996-x

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