工程建设

铌酸钠-钾三元体系KNN-BZ-xBA无铅压电陶瓷的制备及性能

邓思玙, 高露, 林国宇, 杨绳岩

摘要


采用传统固相烧结法制备了(.945-x)K0.48Na0.52NbO3-0.055BaZrO3-xBiAlO3(KNN-0.055BZ-xBA)铌酸钠钾三元体系无铅压电陶瓷，并研究了BiAlO3掺杂量（x=0.002, 0.0025, 0.0035, 0.004）的改变对陶瓷样品的相结构、致密度、介电性能及压电性能的影响。研究结果表明：BaZrO3和BiAlO3的适量掺杂及以BiAlO3掺杂量的变化并未改变陶瓷样品的晶体结构，各组分样品全部为标准的钙钛矿结构，说明各掺杂离子在KNN-0.055BZ-xBA晶格中可以形成均匀固溶体，改善了其微观结构。与纯的KNN陶瓷样品相比，KNN-0.055BZ-xBA三元体系的正交相到四方相相转变温度(TO–T)大幅度向室温方向移动，压电性能也得到了明显的改善。在x=0.0035时，该陶瓷样品表现出良好的电学性能，Curie温度介电常数峰(εr)最大值5905，压电常数(d33)达到最大值195pC?N-1。

关键词


铌酸钠-钾三元体系；掺杂改性；制备；介电性能；压电性能

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参考


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DOI: https://doi.org/10.33142/ec.v5i8.6554

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