Abstract
Fe2O3-containing 0.96(K0.5Na0.5)(Nb0.93Sb0.07)-(0.04-x)CaZrO3-x(Bi, Ag)ZrO3 piezoceramics with 0.0 ≤ x ≤ 0.04 fabricated at 1090 °C show a dense microstructure without any secondary phases. The piezoceramic with x = 0.03 has an ideal rhombohedral–orthorhombic–tetragonal (R-O-T) multi-structure because its constituent structure proportions are similar. Its R-O-T phase transition temperature (TR-O-T) increases with increasing measuring frequency, indicating that this piezoceramic exhibits relaxor properties which develop near its ferroelectric-to-ferroelectric phase transition temperature, that is, its TR-O-T. This piezoceramic has nanodomains that are approximately 3 nm × 20 nm in size. The associated low boundary energies of these domains are expected to facilitate domain rotation. Furthermore, the piezoceramic has an extremely high piezoelectric constant (d33) of 680 ± 10 pC/N, which exceeds the maximum d33 reported in the literature for similar materials. This high d33 is attributed to the existence of an ideal R-O-T multi-structure and nanodomains.
Original language | English |
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Article number | 161817 |
Journal | Journal of Alloys and Compounds |
Volume | 889 |
DOIs | |
Publication status | Published - 2022 Jan 5 |
Bibliographical note
Funding Information:This work was supported by the Technology Innovation Program funded by the Ministry of Trade, Industry & Energy (MOTIE) [Project no. 20008775] and National R&D Programs through the National Research Foundation of Korea (NRF) funded by ICT [Project no. 2020M3H4A3105596]. We also thank the KU-KIST Graduate School Program of Korea University.
Funding Information:
This work was supported by the Technology Innovation Program funded by the Ministry of Trade, Industry & Energy ( MOTIE ) [Project no. 20008775 ] and National R&D Programs through the National Research Foundation of Korea (NRF) funded by ICT [Project no. 2020M3H4A3105596 ]. We also thank the KU-KIST Graduate School Program of Korea University.
Publisher Copyright:
© 2021
Keywords
- Crystal structure
- Domain structure
- Lead free
- Piezoelectric ceramic
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry