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Abstract

Porous ferroelectric materials have been evaluated for their piezoelectric energy harvesting capabilities. Macro-porous barium titanate (BaTiO3) ceramics were fabricated with a range of porosities using the burned out polymer spheres process. The pore fraction was tailored by mixing a pore forming agent with BaTiO3 powder in varying amounts by weight before cold-pressing and pressureless sintering. Introducing porosity into the ferroelectric significantly increased the energy harvesting figure of merit, with a maximum of 2.85pm2/N obtained at ∼40% relative density compared with ∼1.0 pm2/N for the dense material. The results demonstrate that introducing porosity into a piezoelectric potentially provides an effective route to improving the vibration energy harvesting capability of these materials.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalFerroelectrics
Volume498
Issue number1
Early online date18 May 2016
DOIs
Publication statusPublished - 31 Aug 2016

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Keywords

  • barium titanate
  • Piezoelectric energy harvesting
  • porous

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