Influence of Oxygen Substoichiometry on the Dielectric Properties of BaTiO 3‐δ Nanoceramics Obtained by Spark Plasma Sintering
Source abstract
Abstract
Oxygen‐deficient BaTiO 3‐δ nanoceramics were prepared by spark plasma sintering. Partially reduced raw nanopowders led to unusual dielectric properties. A short postsintering treatment was performed to reach a high ε r /tan δ, which makes them attractive for industrial applications such as low‐frequency capacitors. Surprisingly, our ceramics also remained black even after annealing for 5 days at 850°C in air, indicating the presence of barriers against oxygen diffusion. This exceptional behavior in pure barium titanate was consistent with a core–shell structure made of semiconductive grains and insulating grain boundaries, due to the presence of Ti 3+ /Ti 4+ and oxygen vacancies.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Dielectric properties of ceramics · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institut Carnot CIRIMAT UMR CNRS‐UPS‐INP 5085 Université de Toulouse 118 route de Narbonne 31062 Toulouse Cedex 9 France
Department of Materials Science and Engineering University of Florida Gainesville Florida 32611
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