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Growth and piezoelectric properties of melilite ABC _3O _7 crystals

机译：陨石ABC _3O _7晶体的生长和压电性能

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摘要

Single ABC _3O _7 crystals with the melilite structure, including SrLaGa _3O _7, SrGdGa _3O _7, and BaLaGa _3O _7, 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 × 10 ~(13) ohm·cm at room temperature. The dielectric permittivity ε _(11), piezoelectric constant δ _(14), and electromechanical coupling coefficient κ' _(12) were found to be on the order of 15-17, 12-15 pC/N, and 16-19%, respectively. For an ABC _3O _7 group member such as SrLaGa _3O _7, the melting temperature was measured to be 1588 °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 °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 °C) makes the ABC _3O _7 family promising candidate materials for high temperature piezoelectric applications.
机译：通过Czochralski方法已经成功地生长出具有硅铝石结构的ABC _3O _7单晶体，包括SrLaGa _3O _7，SrGdGa _3O _7和BaLaGa _3O _7。使用共振技术和阻抗分析确定了一套完整的室温弹性，介电和压电常数。我们的结果表明，晶体表现出优异的压电和弹性性能。发现室温下的电阻率约为6×10〜（13）ohm·cm。介电常数ε_（11），压电常数δ_（14）和机电耦合系数κ'_（12）约为15-17、12-15 pC / N和16-19 ％， 分别。对于诸如SrLaGa _3O _7的ABC _3O _7组成员，测得的熔融温度为1588°C，在该温度以下，晶体保持良好的热稳定性。因此，研究了压电特性随温度在-50至120°C范围内的变化。频率与温度系数确定为-16至-55 ppm / K，具体取决于方向。介电常数，压电常数和机电耦合系数显示出良好的温度稳定性。在其熔点（1600°C左右）以下没有任何相变，使得ABC _3O _7系列有望成为高温压电应用的候选材料。

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