首页|Discharge Current Measurement and Depolarization Property of Lead-Free Niobate Piezoceramics
Discharge Current Measurement and Depolarization Property of Lead-Free Niobate Piezoceramics
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Trans Tech Publications Ltd
Lead-free Na_(0.5)K_(0.5)NbO_3 (NKN) piezoelectric ceramics was synthesized by an ordinal solid state reaction method. The ceramics was electrically poled under 3 kV/mm at 150 ℃ for 30 min. The discharge current-flow was measured for the poled ceramics at the heating rate of 1 ℃/min from room temperature up to 500 ℃. The two sharp peaks were observed at 209 and 417 ℃. These temperatures were corresponded to orthorhombic-tetragonal (T_O-t) and tetragonal-cubic (T_C) phase transition temperatures, respectively. The sharp peaks were mainly originated from the decrease of the spontaneous polarization. Additionally, the several large broad patterns were also observed at 280, 363 and 375 ℃, According to the electromechanical coupling factor k_p, which is the indicative parameter of the polarization, mainly decreased at T_O-t and T_C. These broad peaks were not associated with the spontaneous polarization. The peaks seem to have been originated from the discharge current of the oxygen ion migration on elevating temperature inside the poled NKN ceramics.
Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
NETL
NSTL
Trans Tech Publications Ltd
