Atmospheric controlled processing enabling highly textured NKN with enhanced piezoelectric performance
Atmospheric controlled processing enabling highly textured NKN with enhanced piezoelectric performance
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DOI：
10.1016/j.jeurceramsoc.2018.12.047
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发表时间：
2019-04
影响因子：
5.7
通讯作者：
Lisheng Gao;S. Dursun;A. E. Gurdal;E. Hennig;Shujun Zhang;C. Randall
中科院分区：
文献类型：
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作者：
Lisheng Gao;S. Dursun;A. E. Gurdal;E. Hennig;Shujun Zhang;C. Randall
高性能的无铅压电材料作为替代材料，面对潜在的立法行动，解除对铅基压电材料的豁免感兴趣。在这项工作中，我们展示了一个高度织构的商业级锂和钽改性（Na，K）NbO 3（NKN）无铅压电陶瓷，在低氧分压（pO 2）气氛下烧结使用固态模板晶粒生长（TGG）方法。结果表明，适当的低pO 2条件不仅有利于反应性模板晶粒的生长，而且降低了反应性模板晶粒生长所需的温度。获得了具有匡威压电系数d33 *<$680 pmV-1的高织构NKN，这种显著的压电性能可以用NKN的多晶相界位置来解释。综合考虑性能和成本，本研究不仅为NKN的商业化应用提供了可能，而且为未来低成本贱金属内电极的应用提供了一种有效的工艺策略。
High-performance lead-free piezoelectrics are of interest as alternate materials to confront potential legislative actions on lifting the exemption on lead-based piezoelectric materials. In this work, we demonstrated a highly textured commercial-grade Li-and Ta-modified (Na, K) NbO 3 (NKN) lead-free piezoceramic that was sintered under low oxygen partial pressure (pO 2) atmospheres using the solid state template grain growth (TGG) method. It was found that a moderate low pO 2 condition not only facilitated the reactive template grain growth but also lowered the temperature required for such process. Highly textured NKN with a converse piezoelectric coefficient d 33*≈ 680 p m V-1 was obtained, this remarkable piezoelectric property can be explained by the position of the polymorphic phase boundary of NKN. With considerations on both performance and cost, this work not only presented the potential for NKN to meet the requirement of commercial applications, but also provided an effective processing strategy to utilize low cost base metal inner electrodes in the future.