Piezoelectric properties of (Na0.5K0.5)(Nb1- xSbx)O3-SrTiO3 ceramics with tetragonal-pseudocubic PPB structure

Dae Hyeon Kim, Tae Gon Lee, Sung Hoon Cho, Ku Tak Lee, Tae Ho Lee, Youn Woo Hong, Chang Hyo Hong, Jeong Seog Kim, Sahn Nahm

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

CuO-added 0.96(Na0.5K0.5)(Nb1- xSbx)O3-0.04SrTiO3 ceramics sintered at the low temperature of 960°C for 10 hours showed dense microstructures and high relative densities. The specimens with 0.0 ≤ x ≤ 0.04 had orthorhombic-tetragonal polymorphic phase boundary (PPB) structure. Tetragonal-pseudocubic PPB structure was observed in specimens with 0.05 ≤ x ≤ 0.07, while the specimen with x = 0.08 has a pseudocubic structure. The structural variation in the specimens is explained by the decreases in the orthorhombic-tetragonal transition temperature and Curie temperature with the addition of Sb5+ ions. The specimens with 0.05 ≤ x ≤ 0.07, which have tetragonal-pseudocubic PPB structure, had large electric field-induced strains of 0.14%-0.016%. Moreover, these specimens also showed increased d33 values between 280 pC/N and 358 pC/N. In particular, the specimen with x = 0.055 showed particularly enhanced piezoelectric properties: d33 of 358 pC/N, kp of 0.45, and the electric field-induced strain of 0.16% at 4.5 kV/mm.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Keywords

  • Lead-free ceramics
  • Phase transition
  • Piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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