Defect Structure and Electrical Property of Na0.5K0.5NbO3 Lead-Free Piezoceramics

Abstract:

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Na0.5K0.5NbO3 (NKN) lead-free piezoceramics was synthesized by a solid state reaction method. The d.c. conductivitydc and a.c. impedance of the ceramics were measured at the temperature range from 550 oC to room temperature on cooling process. Thedc decreased linearly with decreasing temperature on Arrhenius plot, and the activation energy at the temperature range from 450 to 390 oC and from 390 to 160 oC were 0.65 and 0.90 eV, respectively. The slope change at 390 oC corresponded to Curie temperature of NKN ceramics so that the carriers of these thermally active conductions were alkali metal or oxygen ions in the NKN crystal structure. The impedance of NKN ceramics at high temperature showed two relaxation processes at high and low frequencies, and the leak current was mainly attributed by the conduction through the grain boundary with low impedance value on lower frequency relaxation.

Info:

Periodical:

Key Engineering Materials (Volumes 421-422)

Edited by:

Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata and Kazuo Shinozaki

Pages:

9-12

DOI:

10.4028/www.scientific.net/KEM.421-422.9

Citation:

H. Matsudo et al., "Defect Structure and Electrical Property of Na0.5K0.5NbO3 Lead-Free Piezoceramics", Key Engineering Materials, Vols. 421-422, pp. 9-12, 2010

Online since:

December 2009

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$35.00

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