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BaHf0.05Ti0.95O3 Ceramics from Sol-Gel and Solid-State Processes: Application to the Modelling of Piezoelectric Energy Harvesters.
Brault, Damien; Boy, Philippe; Levassort, Franck; Poulin-Vittrant, Guylaine; Bantignies, Claire; Hoang, Thien; Bavencoffe, Maxime.
Afiliación
  • Brault D; GREMAN UMR 7347, INSA-CVL, University of Tours, CNRS, 41000 Blois, France.
  • Boy P; CEA/Le Ripault, BP16, 37260 Monts, France.
  • Levassort F; GREMAN UMR 7347, INSA-CVL, University of Tours, CNRS, 41000 Blois, France.
  • Poulin-Vittrant G; GREMAN UMR 7347, INSA-CVL, University of Tours, CNRS, 41000 Blois, France.
  • Bantignies C; Innovation Department, VERMON S.A., 37000 Tours, France.
  • Hoang T; Innovation Department, VERMON S.A., 37000 Tours, France.
  • Bavencoffe M; GREMAN UMR 7347, INSA-CVL, University of Tours, CNRS, 41000 Blois, France.
Materials (Basel) ; 17(7)2024 Mar 26.
Article en En | MEDLINE | ID: mdl-38612023
ABSTRACT
A typical piezoelectric energy harvester is a bimorph cantilever with two layers of piezoelectric material on both sides of a flexible substrate. Piezoelectric layers of lead-based materials, typically lead zirconate titanate, have been mainly used due to their outstanding piezoelectric properties. However, due to lead toxicity and environmental problems, there is a need to replace them with environmentally benign materials. Here, our main efforts were focused on the preparation of hafnium-doped barium titanate (BaHfxTi1-xO3; BHT) sol-gel materials. The original process developed makes it possible to obtain a highly concentrated sol without strong organic complexing agents. Sol aging and concentration can be controlled to obtain a time-stable sol for a few months at room temperature, with desired viscosity and colloidal sizes. Densified bulk materials obtained from this optimized sol are compared with a solid-state synthesis, and both show good electromechanical properties their thickness coupling factor kt values are around 53% and 47%, respectively, and their converse piezoelectric coefficient d33∗ values are around 420 and 330 pm/V, respectively. According to the electromechanical properties, the theoretical behavior in a bimorph configuration can be simulated to predict the resonance and anti-resonance frequencies and the corresponding output power values to help to design the final device. In the present case, the bimorph configuration based on BHT sol-gel material is designed to harvest ambient vibrations at low frequency (<200 Hz). It gives a maximum normalized volumetric power density of 0.03 µW/mm3/Hz/g2 at 154 Hz under an acceleration of 0.05 m/s2.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2024 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Suiza

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2024 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Suiza