Phase and Electrical Properties of [Li0.065(Na0.535K0.48)0.95]NbO3 Lead-Free Piezoelectric Ceramics Sintered at Low Temperature

Hai Tao Li; Bo Ping Zhang; Qian Li; Rong Hui Xu

doi:10.4028/www.scientific.net/AMR.415-417.1679

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417Phase and Electrical Properties of...

Phase and Electrical Properties of [Li_0.065(Na_0.535K_0.48)_0.95]NbO₃ Lead-Free Piezoelectric Ceramics Sintered at Low Temperature

Abstract:

Li-doped (Na, K)NbO₃ lead-free piezoelectric ceramics with nominal composition of [Li_0.065(Na_0.535K_0.48)_0.95]NbO₃ were prepared by normal sintering method, and its phase structure, microstructure and electric properties were studied with a special emphasis on the influence of sintering temperature in the range of 950-1020 oC. The result of XRD analysis indicates that a polymorphic phase transition (PPT) separating orthorhombic and tetragonal phases was found at the temperature of 950 oC, whereby enhanced piezoelectric properties of d₃₃=255 pC/N and k_p= 44.5% were obtained although the density was low. Our study indicates that the importance of PPT for enhancing electric properties in niobate-based ceramics at low temperature.

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Advanced Materials Research (Volumes 415-417)

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1679-1682

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https://doi.org/10.4028/www.scientific.net/AMR.415-417.1679

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December 2011

Authors:

Hai Tao Li, Bo Ping Zhang, Qian Li, Rong Hui Xu

Keywords:

Lead-Free Piezoceramic, NKN-Based Ceramics, PPT, Sintering Temperature

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