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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 13: Focus Session: (Multi-)Ferroic States III
KFM 13.8: Talk
Wednesday, March 20, 2024, 12:10–12:30, EMH 225
Structural and electrical properties of Bi0.5Na0.5TiO3-based ceramics synthetize by optimized sol-gel method — •Thomas Fourgassie1,2, Cécile Autret-Lambert1,2, Pierre-Eymeric Janolin2, and Brahim Dkhil2 — 1Laboratoire GREMAN, UMR 7347 Université de Tours, CNRS, INSA CVL, 37200 Tours, France — 2Laboratoire SPMS, UMR 8580 Université Paris-Saclay, CNRS, CentraleSupélec, 91190 Gif-sur-Yvette, France
The energetic needs of our society seems to grow endlessly, that is why we need to increase our energy storage capacity for a sustainable future. Novel lead-free solid solutions are promising candidates to replace lead-based piezoelectric ceramics such as Pb(Zr,Ti)O3. Among the lead-free material, Bi0,5Na0,5TiO3 (BNT) ceramics have attracted a large attention for their excellent and competitive dielectric properties. Our goal is to synthetize a new lead-free material based on BNT presenting high energy storage properties in a wide range of temperature. BNT was chosen as a base material for his high maximum polarization (Pmax) and his relaxor properties making his phase transition more diffuse, resulting in broad peaks of dielectric permittivity . In order to improve the electrical properties for our final material, we decided to work on the optimization of the base material BNT by sol-gel method. We therefore report the impact of different synthesis processes, with different temperature of calcination or different time of calcination on the structural and dielectric properties of BNT, as well as the impact of the addition of dopants or excess of already present cations on the high leakage current usually seen in pure BNT.
Keywords: energy storage; dielectric; ferroelectric