Effects of Low Concentration BiFeO3 Additions on Microstructure and Piezoelectric Properties of (K0.5Na0.5)NbO3 Ceramics

Abstract:

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(1- x) K0.5Na0.5NbO3 – x BiFeO3 lead-free piezoelectric ceramics were prepared by the conventional ceramic processing. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. A morphotropic phase boundary (MPB) between the orthorhombic and tetragonal phases was identified in the composition range of x = 0.01. The ceramics exhibit a strong compositional dependence and enhanced piezoelectric properties. The ceramics with 0.6 mol.% BF exhibit good electrical properties (d33 ~146 pC/N, kp ~51%, Tc ~405°C, To-t ~185 °C, εr ~432, and tan θ~ 4.60 %. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that the air-sintered (1−x) KNN− x BF (0.006 < x < 0.01) ceramic is a promising lead-free piezoelectric material.

Info:

Periodical:

Advanced Materials Research (Volumes 335-336)

Edited by:

Yun-Hae Kim, Prasad Yarlagadda, Xiaodong Zhang and Zhijiu Ai

Pages:

968-975

DOI:

10.4028/www.scientific.net/AMR.335-336.968

Citation:

P. Xu et al., "Effects of Low Concentration BiFeO3 Additions on Microstructure and Piezoelectric Properties of (K0.5Na0.5)NbO3 Ceramics", Advanced Materials Research, Vols. 335-336, pp. 968-975, 2011

Online since:

September 2011

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$35.00

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