Structural and piezoelectric properties of textured NLKNS-CZ thick films and their application in planar piezoactuator

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

Research output: Contribution to journalArticlepeer-review

Abstract

0.97(Na0.5-xLixK0.5)(Nb0.89Sb0.11)O3-0.03CaZrO3 [(N0.5-xLxK)(NS)-CZ] piezoceramic (x = 0.325) has a pseudocubic-tetragonal-orthorhombic (PC-T-O) multi-structure. The PC structure formed in this piezoceramic was identified as the R3m rhombohedral structure. This piezoceramic showed the large piezoelectric charge constant (d33) of 515 pC/N due to the PC-T-O multi-structure. The NaNbO3 (NN) templates were used to texture the (N0.5-xLxK)(NS)-CZ thick films along the (001) direction, and the textured thick film (x = 0.0375) had a large Lotgering factor of 95.6%. The PC-T-O multi-structure was observed in this thick film (x = 0.0375), but the thick film (x = 0.0325) showed a PC-O structure owing to the diffusion of the NN templates into the thick film. The textured thick film (x = 0.0375) exhibited an increased d33 of 625 pC/N because of the PC-T-O multi-structure and the lineup of grains along the [001] direction. A textured thick film (x = 0.0375) was used to fabricate a planar-type actuator to confirm its applicability to electrical devices. This actuator exhibits large acceleration (580.3 G) and displacement (150 μm) at a low electric field of 0.2 kV/mm with a short response time of 3.0 ms. Therefore, the (N0.5-xLxK)(NS)-CZ thick films are excellent lead-free piezoceramics.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Actuator
  • NKN
  • Piezoelectric
  • Textured Ceramic

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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