Processing and properties of translucent bismuth sodium titanate ceramics
Processing and properties of translucent bismuth sodium titanate ceramics
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DOI：
10.1016/j.jeurceramsoc.2020.10.009
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
D. Seifert;Linhao Li;K.-Y. Lee;M. Hoffmann;D. Sinclair;M. Hinterstein
中科院分区：
文献类型：
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作者：
D. Seifert;Linhao Li;K.-Y. Lee;M. Hoffmann;D. Sinclair;M. Hinterstein
采用一种新的前驱体法制备了无铅钛酸铋钠压电陶瓷。通过仔细控制工艺参数和烧结气氛，半透明陶瓷具有无气孔、均匀的微结构，在高温下具有极低的介电损耗。由于气孔和其他微结构缺陷通常是器件内部材料失效的原因，因此无气孔的微结构可以对介质器件的工作寿命产生积极影响。同步辐射和表面X射线衍射实验表明，晶体结构明显依赖于烧结参数和缺陷化学成分。显微组织分析表明，第二相与烧结气氛有关。用缩短的研磨过程来调整晶粒度，而不是采用提高焙烧或烧结温度等常用方法。
Lead-free bismuth sodium titanate piezoceramics were processed by a solid-state route with a novel precursor approach. By carefully controlling the processing parameters and sintering atmospheres, translucent ceramics with pore-free, homogeneous microstructures with exceptionally low dielectric loss at elevated temperatures. The pore-free microstructure can influence the operating life of a dielectric device positively, since pores and other microstructural defects are usually responsible for material failures within devices. Synchrotron and surface X-ray diffraction experiments revealed a clear dependence of the crystal structure on sintering parameters and defect chemistry. Microstructural analysis showed a dependency of a secondary phase on the sintering atmosphere. The grain size could be adjusted using a shortened grinding process instead of using the common methods like increasing calcining or sintering temperature.