Improved solid-state conversion and piezoelectric properties of 90Na_1/2Bi_1/2TiO₃-5BaTiO₃-5K_1/2Na_1/2NbO₃ single crystals

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• 作者：Seok-Young Ko^a ; Ji-Hoon Park^b ; Ill-Won Kim^c ; Sung-Sik Won^c ; Sung-Yoon Chung^d ; ^{sychung@kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; Suk-Joong L. Kang^a ; ^e ; ^{sjkang@kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lead-free piezoelectric ; Single crystal ; Solid-state growth ; Electric-field-induced strain ; NBT-BT-KNN
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：407-411
• 全文大小：1366 K

文摘

Na_1/2Bi_1/2TiO₃-BaTiO₃-K_1/2Na_1/2NbO₃ (NBT-BT-KNN) is a promising candidate system for actuator applications in lead-free piezoelectric materials because of its large electric-field-induced strain. We were able to fabricate 96.9% dense 90NBT-5BT-5KNN (mol%) single crystals by the solid-state single crystal growth technique using sintered pellets and SrTiO₃ seed crystals. The fabricated single crystals with a 〈001〉 direction exhibited high piezoelectric performance with a large strain of 0.67% and a high converse piezoelectric constant (S_max/E_max) of about 1670 pm/V at 4 kV/mm. These values are much higher than those previously reported for ceramics, 0.45% and 560 pm/V at 8 kV/mm, and for single crystals, 0.57% and 950 pm/V at 6 kV/mm, of the NBT-BT-KNN system. The measured piezoelectric properties are even comparable with those of lead-containing piezoelectric single crystals, which demonstrates high applicability of the fabricated NBT-5BT-5KNN single crystals for actuators.