Effects of K/Na ratio on the phase structure and electrical properties of (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.91}Ta{sub 0.05}Sb{sub 0.04})O{sub 3} lead-free ceramics
- Department of Materials Science, Sichuan University, Chengdu 610064 (China)
(K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.91}Ta{sub 0.05}Sb{sub 0.04})O{sub 3} (x=0.32-0.56) lead-free piezoelectric ceramics were prepared by conventional sintering. The effects of K/Na ratio on the phase structure and electrical properties of the ceramics were studied. These results indicate that the phase structure undergoes a transition from orthorhombic to tetragonal phase with increase of x. The ceramics with x=0.38 exhibit enhanced electrical properties (d{sub 33}{approx}306 pC/N; k{sub p}{approx}48%; k{sub t}{approx}49%; T{sub c}{approx}337 deg. C; {epsilon}{sub r}{approx}1327; tan {delta}{approx}2.5%; P{sub r}{approx}34.9 {mu}C/cm{sup 2}; E{sub c}{approx}11.3 kV/cm). Enhanced electrical properties of the ceramics should be attributed to the polymorphic phase transition near room temperature. These results show that the ceramic with x=0.38 is a promising lead-free piezoelectric material.
- OSTI ID:
- 21016226
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 25 Vol. 91; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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