Abstract
Perovskite-structured 0.50(Bi1-xLax)FeO3–0.35PbTiO3–0.15Bi(Zn1/2Ti1/2)O3 ceramics with x = 0.0–0.2 were fabricated with traditional solid state reaction method. Their crystallographic structure, dielectric and piezoelectric properties were investigated with various La contents. It was observed that a structural phase transition undergoes from tetragonal to coexistent tetragonal and rhombohedral phase when x≥0.05 and that the tetragonality of c/a ratio and Curie temperature decrease but piezoelectric properties increase with increasing La content. The enhanced piezoelectric performance with La substitution was attributed to the lattice structural changes from the tetragonal phase into the coexistent tetragonal and rhombohedral phase accompanying with tetragonality decreasing. For the Pb0.35Bi0.625La0.025(Ti0.425Zn0.075Fe0.5)O3 ceramics closely at the structural phase boundary poled at 140 °C with 5 kV/mm DC electric field, a good piezoelectric property of d33 = 43 pC/N, ε33T/ε0 = 367 and TC = 497 °C was obtained, which is comparable with the commercial Matsushita lead titanate (MLT) piezoelectric ceramics with d33 = 51 pC/N, ε33T/ε0 = 170 and TC = 495 °C and much promising for application in the fields of high temperature high frequency piezoelectric ceramic filters.
Published Version
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