Effect of the Crystal Structure on the Piezoelectricity of [001]-Textured (Na, K)(Nb, Sb)O3-SrZrO3-(Bi, Ag)ZrO3 Lead-Free Piezoelectric Thick Film

Su Hwan Go, Dae Su Kim, Yeon Gyeong Chae, Seok June Chae, Eun Ji Kim, Hyeon Min Yu, Bum Joo Kim, Seok Jung Park, Joun Ho Lee, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

An amount of 3.0 mol% NaNbO3 seeds was used to align the grains of 0.96(Na0.5K0.5)(Nb0.93Sb0.07)O3-(0.04−x)SrZrO3-x(Bi0.5Ag0.5)ZrO3 [NKNS-(0.04−x)SZ-xBAZ] thick films (0.0 ≤ x ≤ 0.04) along the [001] direction. All the textured thick films had large Lotgering factors (>95%). The textured NKNS-0.02SZ-0.02BAZ thick film has a rhombohedral-orthorhombic-tetragonal (R-O-T) structure with a large proportion of the R-O structure (>80%) and nanodomains (0.7 nm in width and 6 nm in length). This thick film exhibited a large d33 value (760 ± 20 pC/N), kp value (0.58) and strain (0.16% at 4.0 kV/mm), with good temperature stability and fatigue properties. The high piezoelectricity of this thick film can be attributed to its high degree of texturing, optimized domain configuration, and the presence of nanodomains. The piezoelectric ceramic with a large d15/d33 value showed a large d33 value after [001] texturing because of the easy rotation of the spontaneous polarizations. Hence, the d15/d33 value can be used to select piezoelectric ceramics with large d33 values after [001] texturing.

Original languageEnglish
Article number66
JournalActuators
Volume12
Issue number2
DOIs
Publication statusPublished - 2023 Feb

Bibliographical note

Publisher Copyright:
© 2023 by the authors.

Keywords

  • ceramics
  • lead-free
  • piezoelectricity
  • sodium potassium niobate
  • texture

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization

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