Microstructure, dielectric and piezoelectric properties of (K0.5Na0.5)NbO3-Ba(Ti0.95Zr0.05)O3lead-free ceramics with CuO sintering aid

D. Lin, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

43 Citations (Scopus)

Abstract

Using an ordinary ceramic fabrication technique, we fabricated lead-free (1-x)(K0.5Na0.5)NbO3-xBa(Ti0.95Zr0.05)O3ceramics with CuO sintering aid . Ba(Ti0.95Zr0.05)O3diffuses into (K0.5Na0.5)NbO3to form a new solid solution. The ceramics with perovskite structure possess orthorhombic phase at x ≤ 0.04 and become tetragonal phase at ≥ 0.06. Both the paraelectric cubic-ferroelectric tetragonal and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperatures decrease with increasing the concentration of Ba(Ti0.95Zr0.05)O3. The doping of CuO effectively promotes the densification of the ceramics. The coexistence of the orthorhombic and tetragonal phases at 0.04<x<0.06 and the improvement in sintering performances of the ceramics significantly enhance the piezoelectric and dielectric properties at room temperature. The ceramics with x=0.04-0.06 and y=0.75-1.50 possess excellent properties: d33=119-185 pC/N, kP=37-44%, kt=35-49%, ε=341-1129, cosδ=0.7-4.4% and Tc=312-346 °C.
Original languageEnglish
Pages (from-to)359-363
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume88
Issue number2
DOIs
Publication statusPublished - 1 Aug 2007

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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