Enhancement of Piezoelectric Properties of Low-Temperature-Fabricated Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 Ceramics with LiBiO2 Sintering Aid by Post-Annealing Process
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概要
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The improvement of the piezoelectric properties of low-temperature-fabricated 0.375Pb(Mg1/3Nb2/3)O3-0.25PbZrO3-0.375PbTiO3 (PMNZT) ceramics with a LiBiO2 sintering aid was investigated by adopting a post-annealing process. The sinterability of PMNZT powders was markedly enhanced by liquid phase sintering with the addition of LiBiO2, resulting in a decrease in the required sintering temperature from 1000 to 800°C and the formation of a grain boundary layer. And, it was confirmed by a transmission electron microscope-X-ray energy-dispersive spectrometry (TEM-EDS) that the secondary phase along grain boundaries, which deteriorated the piezoelectric properties, included Pb diffused from PMNZT grains as well as Bi from the LiBiO2 additive. The secondary phase along grain boundaries was significantly removed by annealing after sintering. The 0.75 wt% LiBiO2-added PMNZT ceramics sintered at 800°C for 2 h with post-annealing at 800°C for 10 h exhibited a higher electromechanical coupling factor ($k_{\text{p}}$) of 60.8% and a higher piezoelectric coefficient ($d_{33}$) of 504 pm/V (at 15 kV/cm), compared with those of the sintered specimens without post-annealing. Also, LiBiO2-added PMNZT multilayer ceramics with Ag internal electrodes were successfully sintered at 800°C. The post-annealed multilayer ceramics sintered at 800°C exhibited a higher $d_{33}$ value of 506 pm/V. Thus, a low-temperature sintering technique with post-annealing for the removal of the grain boundary layer without deteriorating piezoelectric properties was established.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-09-15
著者
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Akiyama Yoshikazu
R&D Center, RICOH Co., Ltd.
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Hasegawa Tomoyuki
Department Of Materials Science And Engineering Shonan Institute Of Technology
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Hayashi Takashi
Department Of Applied Chemistry Graduate School Of Engineering Osaka University
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Akiyama Yoshikazu
R&D Center, RICOH Co., Ltd., Shinei-cho, Tuzuki-ku, Yokohama 224-0035, Japan
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Hasegawa Tomoyuki
Department of Materials Science and Engineering, Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa 251-8511, Japan
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