| Relaxor-Type Ferroelectric Behavior of (1-x)Bi0.5(Na0.78K0.22)0.5TiO3-xBi(Cu0.5Ti0.5)O3 Lead-Free Piezoelectric Ceramics | |||||
| 작성자 | 김** | 작성일 | 2018-09-05 | 조회수 | 510 |
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Journal Article published 1 Feb 2018 in Science of Advanced Materials volume 10 issue 2 on pages 262 to 266
Authors: Achiri Tange, Hee Sung Kim, Abdul Khaliq, Muhammad Sheeraz, Ill Won Kim
Abstract: We fabricated (1?x)Bi0.5(Na0.78K0.22)0.5TiO3?xBi(Cu0.5Ti0.5)O3, which is a lead-free piezoelectric material, using a conventional solid-state reaction process and investigated its ferroelectric and piezoelectric properties. The addition of small amounts of xBi(Cu0.5Ti0.5)O3 was found to affect the shapes of the polarization-electric field and the strain-electric field hysteresis loops as well as the polarization values. Both the remnant polarization P rand the coercive field E c were found to decrease gradually with increasing xBi(Cu0.5Ti0.5)O3, indicating a shift from normal to relaxor-type ferroelectric behavior. This behavior was further confirmed by analyzing the frequency dispersion in the temperature-dependent dielectric measurements. The strain was significantly increased for a xBi(Cu0.5Ti0.5)O3 content of x = 0.01 and then decreased monotonically with further additions ofxBi(Cu0.5Ti0.5)O3. The largest normalized strain constant (d * 33 = 400 pm/V at 50 kV/cm) was obtained for axBi(Cu0.5Ti0.5)O3 content of x = 0.01. This suggests that this material (at least for a xBi(Cu0.5Ti0.5)O3 content of 0.01 or less) is a promising candidate for actuator applications. |
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