Growth and Piezoelectric Properties of Melilite ABC3O7 Crystals

详细信息    查看全文

• 作者：Yuanyuan Zhang ; Xin Yin ; Haohai Yu ; Hengjiang Cong ; Huaijin Zhang ; Jiyang Wang ; Robert I. Boughton
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：622-628
• 全文大小：495K
• 年卷期：v.12,no.2(February 1, 2012)
• ISSN：1528-7505

文摘

Single ABC₃O₇ crystals with the melilite structure, including SrLaGa₃O₇, SrGdGa₃O₇, and BaLaGa₃O₇, have been successfully grown by the Czochralski method. A complete set of room temperature elastic, dielectric, and piezoelectric constants was determined using resonance techniques and impedance analysis. Our results indicate that the crystals exhibit superior piezoelectric and elastic properties. The electrical resistivity was found to be on the order of 6 脳 10¹³ ohm路cm at room temperature. The dielectric permittivity 蔚₁₁, piezoelectric constant d₁₄, and electromechanical coupling coefficient k鈥?sub>12 were found to be on the order of 15鈥?7, 12鈥?5 pC/N, and 16鈥?9%, respectively. For an ABC₃O₇ group member such as SrLaGa₃O₇, the melting temperature was measured to be 1588 掳C, below which the crystal maintains good thermal stability. Consequently, the piezoelectric properties were studied as a function of temperature over the range of 鈭?0 to 120 掳C. The frequency vs temperature coefficient was determined to be 鈭?6 to 鈭?5 ppm/K, depending on orientation. The dielectric permittivity, piezoelectric constant, and electromechanical coupling coefficient showed good temperature stability. The absence of any phase transitions below their melting points (on the order of 1600 掳C) makes the ABC₃O₇ family promising candidate materials for high temperature piezoelectric applications.