Application of [001]-textured (K, Na)(Nb, Sb)O3-CaZrO3 thick films to piezoelectric energy harvesters

Seok June Chae, Ji won Na, Dae Su Kim, Sun Woo Kim, Su Hwan Go, Hero Kim, Eun Ji Kim, Jae Min Eum, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

Abstract

A (K, Na)NbO3 (KNN)-based lead-free piezoceramic for a piezoelectric energy harvester (PEH) should exhibit a large kij, Qm, dij, and a small εT33 to generate a large power output. Texturing was used to enhance the piezoelectricity of KNN-related piezoceramics. In particular, the kij and dij values of the KNN-based piezoceramics were considerably improved after texturing along the [001] direction, with a small change in the εT330 value, indicating that the [001]-textured KNN-based thick films are good candidates for use in PEHs. The 0.97(K0.5Na0.5)(Nb0.93Sb0.07)O3-0.03CaZrO3 [KN(N0.93S0.07)-CZ] thick film was textured along the [001] direction, and this thick film exhibited a large kp (0.57) and d33 × g33 (25.7 pm2/N), which is the largest d33 × g33 of the KNN-based piezoceramics reported to date. A cantilever PEH fabricated using the textured KN(N0.93S0.07)-CZ thick film exhibited a power density of 21.4 μW/mm3 at the resonance frequency. This is the highest power density observed for PEHs fabricated using lead-free piezoceramics. The PEH also exhibited a power density of 0.023 μW/mm3 at the off-resonance frequency. Therefore, the textured KN(N0.93S0.07)–CZ thick film is a good candidate for use in PEHs.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • (C) Piezoelectric properties
  • (D) Perovskites
  • (E) Functional applications
  • A) tape casting
  • Reactive template grain growth (RTGG)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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