Excellent piezoelectric properties of (K, Na)(Nb, Sb)O3-CaZrO3-(Bi, Ag)ZrO3 lead-free piezoceramics

Su Hwan Go, Dae Su Kim, Jae Min Eum, Ho Sung Shin, Seok June Chae, Sun Woo Kim, Eun Ji Kim, Jong Un Woo, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


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 languageEnglish
Article number161817
JournalJournal of Alloys and Compounds
Publication statusPublished - 2022 Jan 5


  • Crystal structure
  • Domain structure
  • Lead free
  • Piezoelectric ceramic

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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