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Study of BNT-BKT-BT lead-free piezoelectric ceramics and their application in piezoelectric devices.

机译：BNT-BKT-BT无铅压电陶瓷的研究及其在压电器件中的应用。

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摘要

Lead-free piezoelectric ceramics, 0.90Bi0.5Na 0.5TiO3-0.05Bi0.5K0.5TiO3-0.05BaTiO 3 (BNKBT-5), have been fabricated by a solid-state reaction method. The dielectric, piezoelectric and ferroelectric properties of the ceramics have been measured and the microstructures studied by X-ray diffraction and SEM. In the ferroelectric hysteresis loop measurements, Pr ∼ 28.5 muC/cm2 and Ec ∼3.5 MV/m have been observed. The electromechanical coupling coefficients kp and kt are 0.31 and 0.46, respectively. Those properties are comparable to that of lead-based ceramics such as PZT.; Three different compounds, including CeO2, Ca2Fe 2O5 and (Bi0.5Li0.5)TiO3, have been used as additives/dopants to improve the properties of BNKBT-5. All the samples with different compositions have been characterized. The measured properties are compared with that of BNKBT-5. It has been found that the BNKBT-5 doped with 1.5 mol% of (Bi0.5Li0.5)TiO3, namely BNKLBT-1.5, has the best performance. It can enhance kp, kt, Qm, Pr, and can reduce tandelta but do not lower the depolarization temperature.; Two different types of devices have been fabricated using BNKBT-5 and BNKLBT-1.5 ceramic rings. The first device is compressive-type accelerometers. A PZT accelerometer with similar structure has also been fabricated for comparison. The accelerometers are calibrated using a back-to-back calibration method against a standard reference accelerometer. Within the +/-2.5% tolerance, the mean sensitivity of PZT, BNKBT and BNKLBT accelerometer is 4.34 pC/ms -2 (50 Hz to 8.24 kHz), 2.24 pC/ms-2 (50 Hz to 10.1 kHz) and 2.97 pC/ms-2 (50 Hz to 12.45 kHz), respectively. The BNKLBT-1.5 accelerometer has a reasonably high sensitivity and the broadest sensing frequency range which would be the most preferable choice for structural health monitoring applications.; The second device is ultrasonic wirebonding transducers for microelectronic packaging. It has been found that if titanium is used as the metal parts in the transducer, the BNKLBT-1.5 transducer has similar axial displacement (∼1.6 mum) to that of PZT/stainless steel (state-of-the-art transducer) transducer presumably because the lead-free ceramic has an acoustic impedance close to that of titanium metal. The lateral displacement of the BNKLBT-1.5 is much smaller than that of PZT transducer thus can improve the bonding quality. It shows that lead-free ceramics has the potential to replace PZT in certain transducer designs.
机译：通过固态反应法制造了0.90Bi0.5Na 0.5TiO3-0.05Bi0.5K0.5TiO3-0.05BaTiO 3（BNKBT-5）无铅压电陶瓷。测量了陶瓷的介电，压电和铁电性能，并通过X射线衍射和SEM研究了其微观结构。在铁电磁滞回线测量中，已观察到Pr〜28.5μC/ cm2，Ec〜3.5 MV / m。机电耦合系数kp和kt分别为0.31和0.46。这些性能与PZT等铅基陶瓷的性能相当。三种不同的化合物（包括CeO2，Ca2Fe 2O5和（Bi0.5Li0.5）TiO3）已用作添加剂/掺杂剂，以改善BNKBT-5的性能。具有不同组成的所有样品均已表征。将测得的性质与BNKBT-5的性质进行比较。已经发现，掺杂有1.5mol％的（Bi0.5Li0.5）TiO 3的BNKBT-5，即BNKLBT-1.5，具有最佳性能。可以提高kp，kt，Qm，Pr，并降低tandelta，但不会降低去极化温度。已经使用BNKBT-5和BNKLBT-1.5陶瓷环制造了两种不同类型的设备。第一个设备是压缩式加速度计。为了比较，还制造了具有类似结构的PZT加速度计。加速度计使用背对背校准方法相对于标准参考加速度计进行校准。在+/- 2.5％的公差范围内，PZT，BNKBT和BNKLBT加速度计的平均灵敏度分别为4.34 pC / ms -2（50 Hz至8.24 kHz），2.24 pC / ms-2（50 Hz至10.1 kHz）和2.97 pC / ms-2（50 Hz至12.45 kHz）。 BNKLBT-1.5加速度计具有相当高的灵敏度和最宽的感测频率范围，这对于结构健康监测应用而言将是最可取的选择。第二个设备是用于微电子封装的超声引线键合换能器。已经发现，如果将钛用作换能器中的金属零件，则BNKLBT-1.5换能器的轴向位移（〜1.6毫米）与PZT /不锈钢（最先进的换能器）的轴向位移近似因为无铅陶瓷的声阻抗接近于钛金属。 BNKLBT-1.5的横向位移远小于PZT换能器的横向位移，因此可以提高键合质量。这表明在某些换能器设计中，无铅陶瓷有可能取代PZT。

著录项

  • 作者

    Choy, Siu Hong.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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