Growth mechanism and enhanced electrical properties of K_0.5Na_0.5NbO₃-based lead-free piezoelectric single crystals grown by a solid-state crystal growth method

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• 作者：Jie Yang^a ; ^b ; Qunbao Yang^a ; ^{qb_yang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yongxiang Li^a ; ^{yxli@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{yxli1066@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Yun Liu^c
• 关键词：KNN ; Single crystal ; Lead-free ; Piezoelectric ; SSCG
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：36
• 期：3
• 页码：541-550
• 全文大小：5700 K

文摘

(K_0.45Na_0.55)_0.94Li_0.06NbO₃ (KNLN) single crystals were grown by a solid-state crystal growth (SSCG) method. The effects of MnO₂ and crystal orientation of the seeds on the KNLN single crystal growth were investigated. It is found that liquid phase and interfacial reaction mechanisms affect the crystal growth for the SSCG. Using the <110>-oriented KTaO₃ crystal as seeds, prism-shaped KNLN-100xMnO₂ (x = 0–0.02) single crystals with a dimension of ∼10 mm × 10 mm were successfully obtained. The electrical properties of such single crystals were affected with MnO₂ addition. The resultant <100>-oriented KNLN single crystals exhibit excellent piezoelectric performances: S_max = 0.38% and $d_{33}^{*}=995\mathrm{p}\mathrm{m}/\mathrm{V}$ at E_max = 38 kV/cm, T_C = 460 °C, superior to other KNN-based piezoceramics even exceed lead-based ceramics. This work indicates that the SSCG is a practicable approach to prepare high-performance KNLN lead-free piezoelectric single crystals.