Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3lead-free ceramics

Dunmin Lin, Qiaoji Zheng, Kin Wing Kwok, Chenggang Xu, Chun Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

Lead-free MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3ceramics have been fabricated by a conventional ceramic technique and their dielectric and piezoelectric properties have been studied. Our results show that a small amount of MnO2 (0.5-1.0 mol%) is enough to improve the densification of the ceramics and decrease the sintering temperature of the ceramics. The co-effects of MnO2doping and Sb-substitution lead to significant improvements in the ferroelectric and piezoelectric properties. The K0.5Na0.5Nb0.92Sb0.08O3ceramic with 0.5 mol%MnO2doping possesses optimum propeties: d33=187 pC/N, kP= 47.2%, εr= 980, tanδ = 2.71% and Tc= 287 °C. Due to high tetragonal-orthorhombic phase transition temperature (To-t∼ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3ceramic with 0.5 mol%MnO2doping exhibits a good thermal stability of piezoelectric properties.
Original languageEnglish
Pages (from-to)649-655
Number of pages7
JournalJournal of Materials Science: Materials in Electronics
Volume21
Issue number7
DOIs
Publication statusPublished - 1 Jul 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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