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.
|Number of pages||5|
|Journal||Applied Physics A: Materials Science and Processing|
|Publication status||Published - 1 Aug 2007|
ASJC Scopus subject areas
- Materials Science(all)