Fatigue-resistant, temperature-insensitive strain behavior and strong red photoluminescence in Pr-modified 0.92(Bi_0.5Na_0.5)TiO₃-0.08(Ba_0.90Ca_0.10)(Ti_0.92Sn_0.08)O₃ lead-free ceramics

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• 作者：Jigong Hao^a ; ^{haojigong@lcu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhijun Xu^a ; ^{zhjxu@lcu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ruiqing Chu^a ; Wei Li^a ; Peng Fu^a ; Juan Du^a ; Guorong Li^b
• 关键词：Ceramics ; Ferroelectrics ; Electrical properties ; Fatigue ; Luminescence
• 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：877-882
• 全文大小：1672 K

文摘

An electric-field-induced large strain and strong photoluminescence was achieved by introducing trivalent Pr³⁺ as the activator into 0.92(Bi_0.5Na_0.5)TiO₃ − 0.08(Ba_0.90Ca_0.10)(Ti_0.92Sn_0.08)O₃ (BNT−8BCST) ceramics. Around a critical composition of 0.4 mol% Pr³⁺, a large strain of ∼0.39% with a relatively small hysteresis compared with existing lead-free Bi-perovskite ceramics was obtained. In particular, the strain is very resistant to field cycling and thermal shock, giving the materials attractive for its exceptionally good fatigue resistance and high temperature stability. Besides the excellent electrical properties, Pr³⁺-modified BNT−8BCST host exhibits a strong photoluminescence with a bright red emission at 610 nm assigned to ¹D₂ → ³H₄ transitions of the Pr³⁺ ions upon a blue light excitation of 400–500 nm. The photoluminescence can be enhanced through poling treatment of the samples. Moreover, samples have a superior water resistance property which almost maintaining the same photoluminescence intensity after 40 h water immersion time. These results suggest the material may have potential application as a multifunctional device such as “on-off” actuator and electric field-controlled photoluminescence devices by integrating its excellent luminescence and electrical properties.