Large Electrostrain in K(Nb1−xMnx)O3 Lead-Free Piezoelectric Ceramics

Jong Hyun Kim, Dae Hyeon Kim, Tae Ho Lee, Tae Gon Lee, Ji Hyun Lee, Bo Yun Kim, Sahn Nahm, Chong Yun Kang, Jungho Ryu, J. Jones

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


K(Nb1−xMnx)O3 (KN1−xMx) ceramics with 0.005 ≤ x ≤ 0.015 were sintered at 1020°C through a normal sintering process without the formation of a liquid phase. They exhibited double polarization versus electric field (P–E) hysteresis and sprout-shaped strain versus electric field (S–E) curves owing to the presence of a defect dipole (PD), which was formed between the acceptor Mn3+ ion and the oxygen vacancy. Moreover, the aging process was not required to develop the PD. The KN1−xMx ceramics exhibited a large strain of ~0.2% at 6.0 kV/mm. For the KN0.985M0.015 ceramic, this large strain was maintained after 104 cycles of an electric field of 6.0 kV/mm. This ceramic also maintained a double hysteresis curve at 200°C. Therefore, the KN0.985M0.015 ceramic has a large electric field-induced strain, along with good thermal and fatigue properties for multilayer piezoelectric actuators.

Original languageEnglish
Pages (from-to)4031-4038
Number of pages8
JournalJournal of the American Ceramic Society
Issue number12
Publication statusPublished - 2016 Dec 1


  • ferroelectricity/ferroelectric materials
  • lead-free ceramics
  • piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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