High-power piezoelectric energy harvesters (PEHs) require piezoceramics with a large kp and d33 but small εT33/ε0 values. The [0 0 1]-textured 0.96(Na, K)(Nb1−xSbx)–0.04SrZrO3 piezoceramics (x = 0.025 and 0.045) exhibited the improved electromechanical coupling factor (kp) and piezoelectric charge constant (d33); however, the increase of dielectric constant (εT33/ε0) was not significant. Further, the textured piezoceramic with x = 0.045 shows the large d33 × g33 value of 21.5 pm2/N, where g33 is piezoelectric voltage constant, indicating that texturing is a good technique to fabricate the piezoceramics for PEH. The impedance curve of the PEH consisting of the metal substrate and textured piezoceramic shows a piezoelectric resonance peak at a low frequency, which is the same as the mechanical resonance frequency of the PEH. Hence, the PEH can be considered a piezoelectric material. The figure of merit of the PEH was determined using the mechanical quality and electromechanical coupling factor calculated from the impedance curve of the PEH. A large power output of 1.7 mW was obtained from the type-1 PEH at the resonance frequency produced using the textured thick film (x = 0.045). Hence, this PEH can be used as a permanent power source for microelectronic devices in the Internet of Things.
Bibliographical noteFunding Information:
Sun‐Woo Kim and Seok‐June Chae contributed equally to this work. This work was supported by the National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (Project no. 2020M3H4A3105596) and the Technology Innovation Program of the MOTIE/KEIT grant funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) (Project no. 20010938, Development of 630‐V high‐capacity MLCC materials and components for power trains).
© 2022 The American Ceramic Society.
- energy harvesting
- figure of merit
- lead-free ceramics
- piezoelectric materials/properties
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry