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

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13 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
JournalJournal of the American Ceramic Society
Publication statusAccepted/In press - 2016


  • Ferroelectricity/ferroelectric materials
  • Lead-free ceramics
  • Piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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