Structural dependence of piezoelectric, dielectric and ferroelectric properties of K0.5Na0.5(Nb1-2x/5Cux)O3lead-free ceramics with high Qm

Xiaohui Tan, Huiqing Fan, Shanming Ke, Li Min Zhou, Yiu Wing Mai, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)


(K0.5Na0.5)(Nb1-2x/5Cux)O3(abbreviated as KNNC, x = 0-2%) lead-free ceramics were synthetized by the solid state solution method. Pure perovskite phase with orthorhombic symmetry was observed. The evolution of the structure of KNNC was examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman scattering spectra techniques. Our results revealed that, defect dipoles (Cu'''Nb-VO• •)' were formed and provided a restoring force to reverse the switched polarization, which resulted in double P-E hysteresis loops in KNNC with Cu doping at x = 0.75% and 1%. However, non-polar defect complex (VO••-Cu'''Nb-VO••) • caused a lattice shrinkage and the observed square shaped P-E loops in KNNC ceramics under high doping levels (x > 1%).
Original languageEnglish
Pages (from-to)4472-4477
Number of pages6
JournalMaterials Research Bulletin
Issue number12
Publication statusPublished - 1 Dec 2012


  • A. Ceramics
  • D. Defects
  • D. Piezoelectricity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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