CuO-added KNbO3-BaZrO3 lead-free piezoelectric ceramics with low loss and large electric field-induced strain

Jongseong Park, Dae Hyeon Kim, Tae Gon Lee, Sung Hoon Cho, Su Jin Park, Jungho Ryu, Sahn Nahm

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

CuO-added (1-x)KNbO3-x mol%BaZrO3 ceramics with 0.0≤x≤7.0 were sintered at 960°C. Large double polarization vs electric field (P-E) and sprout-shaped strain vs electric field (S-E) hysteresis curves were obtained from the specimens with x≤2.0. They exhibited large polarizing electric fields (EP) owing to the presence of a large number of defect dipoles (PDs) that formed between Cu2+ ions and oxygen vacancies. Small double P-E hysteresis curves were observed for the specimens with x≥3.0 with reduced EP because of the decreased number of PDs and the presence of a polymorphic phase structure containing both orthorhombic and pseudocubic structures. In particular, the specimen with x=5.0 exhibited a large strain of 0.16% at 8.0 kV/mm with a small EP of 1.2 kV/mm and good fatigue property: this specimen maintained a strain of 0.13% at 6.0 kV/mm after 106 cycles of 3.0 kV/mm.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusAccepted/In press - 2017

Keywords

  • Energy conversion
  • Lead-free ceramics
  • Piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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