Growth and Piezoelectric Properties of Melilite ABC3O7 Crystals
Growth and Piezoelectric Properties of Melilite ABC3O7 Crystals
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DOI：
10.1021/cg2007205
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发表时间：
2012-02-01
影响因子：
3.8
通讯作者：
Boughtont, Robert I.
中科院分区：
文献类型：
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作者：
Zhang, Yuanyuan;Yin, Xin;Boughtont, Robert I.
采用提拉法成功地生长了具有黄长石结构的ABC（3）O（7）单晶，包括SrLaGa 3 O 7，SrGdGa 3 O 7和BaLaGa 3 O 7。一套完整的室温下的弹性，介电和压电常数测定使用谐振技术和阻抗分析。我们的研究结果表明，该晶体表现出优越的上级压电和弹性性能。室温下的电阻率为6 × 10 ~（13）ohm-cm。发现介电常数e、I、压电常数d14和机电耦合系数k '（12）分别在15-17、12-15 pC/N和16- 19%的数量级。对于ABC（3）O（7）族成员如SrLaGa 3 O 7，测量的熔化温度为1588 ℃，低于该温度晶体保持良好的热稳定性。因此，在-50至120摄氏度的范围内研究了压电性能作为温度的函数。频率与温度的系数被确定为-16至-55 ppm/K，这取决于取向。介电常数、压电常数和机电耦合系数具有良好的温度稳定性。在低于其熔点（大约1600摄氏度）的温度下没有任何相变，使得ABC（3）O（7）家族有希望成为高温压电应用的候选材料。
Single ABC(3)O(7) crystals with the mellite 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 X 10(13) ohm-cm at room temperature. The dielectric permittivity e,I, piezoelectric constant d14, and electromechanical coupling coefficient k'(12) were found to be on the order of 15-17, 12-15 pC/N, and 16-19%, respectively. For an ABC(3)O(7) group member such as SrLaGa307, the melting temperature was measured to be 1588 degrees C, below which the crystal maintains good thermal stability. Consequently, the piezoelectric properties were studied as a function of temperature over the range of -50 to 120 degrees C. The frequency vs temperature coefficient was determined to be -16 to -55 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 degrees C) makes the ABC(3)O(7) family promising candidate materials for high temperature piezoelectric applications.