Periodic configuration of δ-boundaries and ferroelectric domains in Li-modified (K, Na)NbO₃ lead-free piezoelectric single crystals by solid state crystal growth

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• 作者：Zhengqian Fu^a ; ^b ; ^c ; Jie Yang^d ; Huizhu Yu^d ; Yongzhe Wang^b ; Ping Lu^a ; ^b ; Qunbao Yang^d ; Fangfang Xu^a ; ^b ; ^c ; ^{ffxu@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yongxiang Li^c ; ^d ;
• 关键词：Lead-free piezoelectrics ; Ferroelectric domain ; SSCG ; Domain engineering ; KNN
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：593-598
• 全文大小：3182 K

文摘

(K_0.45Na_0.55)_0.94Li_0.06NbO₃ (KNLN) lead-free piezoelectric single crystals have been prepared by solid-state crystal growth (SSCG) method using faceted KTaO₃ single crystals as a seed. SEM-EBSD, PFM and TEM investigations revealed a specific periodic configuration of δ-boundaries and ferroelectric domains in the KNLN single crystal. The single crystal is sliced into several nearly parallel segments by δ-boundaries and each segment has a mean thickness of 2–3 μm. Neighboring segments show a misorientation of 1.4°/[1232] while the alternate segments have the same orientation. The two segments exhibit different ferroelectric domain structures: periodic (100) domain walls and (1${\displaystyle \overline{1}}$l) domain walls, respectively. The periodic (100) domain wall pattern can be sketched by tetragonal 180° or orthorhombic 90° domains. The as-observed periodic configuration of small-angle δ-boundaries and ferroelectric domains could be related to the specific stress fields in the epitaxial crystal growth embedded in a ceramic matrix.