Thermally stable large strain in low-loss (Na0.2K0.8)NbO3-BaZrO3 for multilayer actuators

Sun Woo Kim, Tae Gon Lee, Dae Hyeon Kim, Eun Ji Kim, Dae Su Kim, Woo Seok Kang, Wook Jo, Sang Jin Lee, Seung Ho Han, Hyung Won Kang, Youn Woo Hong, Sahn Nahm

Research output: Contribution to journalArticle

Abstract

CuO-doped (1–x)(Na0.2K0.8)NbO3-xBaZrO3 ceramics (0.0 ≤ x ≤ 0.06) were densified at 960°C. The ceramic with x = 0 exhibited a large sprout-shaped strain vs electric-field (S-E) curve and a double polarization vs electric-field (P-E) hysteresis curve, owing to the defect polarization (PD) developed between Cu2+ ions at Nb5+ sites and oxygen vacancies. The sizes of the S-E and P-E loops decreased with increasing x, owing to the decrease in the number of PDs. The ceramic with x = 0.04 displayed small S-E and P-E curves, indicating its small dielectric loss. It exhibited large strain (0.19% at 8.0 kV/mm) at room temperature, which was maintained at 200°C. A similar strain was observed after applying 106 cycles of an electric field (3.0 kV/mm). Hence, this specimen exhibited large strain with excellent thermal and fatigue properties. Moreover, the synthesized multilayer actuator using the ceramic with x = 0.04 showed excellent vibrational properties, making it promising for applications in multilayer piezoelectric actuators.

Original languageEnglish
Pages (from-to)6837-6849
Number of pages13
JournalJournal of the American Ceramic Society
Volume102
Issue number11
DOIs
Publication statusPublished - 2019 Nov 1

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Keywords

  • dielectric loss
  • lead-free ceramics
  • multilayers
  • piezoelectric materials/properties
  • strain

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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