| 摘要: |
| 压电材料的疲劳性能是其在驱动器应用中的一个重要指标,开发兼有优良电致应变响应及抗疲劳性能的环境友好压电材料近来吸引了国内外广泛关注.在对具有大应变的无铅压电体系(0.935-x)Bi0.5Na0.5TiO3-0.065BaTiO3-xSrTiO3(BNBSTx)前期研究基础上,进一步表征和分析了其单、双向电场下的疲劳性能.结果表明:该体系在疲劳106次前后,表现出优异的电学稳定性,实验中分析和讨论了有关疲劳的物理机制,认为该体系电学稳定性能优异的原因主要是其相对较低的缺陷密度,在单、双向电场下极化偏转过程中,电畴钉扎现象及局部电荷聚集现象较弱. |
| 关键词: 无铅 疲劳 应变 驱动器 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金(11204179,61376010);上海市教委“晨光计划”(11CG49) |
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| Fatigue properties and intrinsic mechanism for the environmental-friendly piezoelectric materials for actuator applications |
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TIAN Chengyue, WANG Feifei, WANG Qin, LIU Dan, LIU Bao, SHI Wangzhou
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College of Mathematics and Sciences,Shanghai Normal University
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| Abstract: |
| Development of environmental-friendly lead-free piezoelectric ceramics with both large strain response and fatigue-resistant properties attracted much attention.In this work,A ternary solid solution (0.935-x)Bi0.5Na0.5TiO3-0.065BaTiO3-xSrTiO3(BNBSTx),reported in our previous work,that exhibits a large strain response at a critical composition,was investigated with the emphasis on its fatigue behavior.The results indicated that BNBST exhibited almost fatigue-resistant behavior after 106 cycles.The intrinsic mechanism was also discussed based on the complex impedance spectrum which was suggested to be originated from the lower defect density. |
| Key words: lead-free fatigue strain actuator |
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