首页|Defect Structure and Electrical Property of Na_(0.5)K_(0.5)NbO_3 Lead-Free Piezoceramics
Defect Structure and Electrical Property of Na_(0.5)K_(0.5)NbO_3 Lead-Free Piezoceramics
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NETL
NSTL
Trans Tech Publications Ltd
Na_(0.5)K_(0.5)NbO_3 (NKN) lead-free piezoceramics was synthesized by a solid state reaction method. The d.c. conductivity σ_(dc) and a.c. impedance of the ceramics were measured at the temperature range from 550 ℃ to room temperature on cooling process. The σ_(dc) decreased linearly with decreasing temperature on Arrhenius plot, and the activation energy at the temperature range from 450 to 390 ℃ and from 390 to 160 ℃ were 0.65 and 0.90 eV, respectively. The slope change at 390 ℃ 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.
NETL
NSTL
Trans Tech Publications Ltd
