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Effect of doping Gd2O3 on dielectric and piezoelectric properties of BaZr0.1Ti0.9O3 ceramics by sol–gel method
摘要： The effects of sintering temperature and doping amount of gadolinium ions on the microstructures and electrical properties of sol gel derived Ba (Zr0.1Ti0.9) O3 + xGd ceramics were investigated in this manuscript. XRD analysis showed that the main crystalline phase of BZT-xGd ceramic samples exhibit a perovskite structure without significantly change. The sample sintered at 1350 °C and doped with gadolinium ions of 0.5 mol% has uniform grain size and compact morphology. And the sample(1350 °C—0.5 mol%) also has a high piezoelectric charge coefficient of 131.33 pC/N, large plane electromechanical coupling coefficient of 0.22, high dielectric constant of 10504, and small dielectric loss of 0.01. The correlation of dielectric and piezoelectric properties of BZT-xGd ceramics with doping amount of Gd3+ ion has been explained by the lattice theory.
关键词： BZT-xGd ceramics,dielectric properties,sol–gel method,gadolinium doping,piezoelectric properties
更新于2025-09-04 15:30:14
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Dynamic regulating of single-mode lasing in ZnO microcavity by piezoelectric effect
摘要： Realizing single-mode-lasing output while being able to dynamically select and regulate a specified resonant mode could bring revolutionary impact for laser technology, on-chip data communication, and optical sensing/switches. Here, we demonstrate a single-mode lasing achieved by the piezoresistive and piezoelectric polarization synergistic effect on an epoxy-encapsulated ZnO microresonator. Based on relative shifts of gain spectrum and the resonant wavelength, the lasing mode in a hexagonal ZnO rod can be selected and regulated dynamically within a certain range. The relationship between the corresponding applied strain and the tunable refractive index is analyzed in depth and discussed systematically. Our studies open up exciting avenues for constructing optical mode-phase modulator, high-sensitive optical switches and color-perceived optical sensing.
关键词： optical sensing,ZnO microresonator,single-mode lasing,piezoelectric effect,dynamic regulation
更新于2025-09-04 15:30:14
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Piezoelectric Property Enhancement of PZT Thick Film via Pulsed Flash Poling during Sintering
摘要： Lead zirconate titanate (PZT) is a widely used piezoelectric material due to its high piezoelectric response. High temperature thermal sintering and poling are two important steps to obtain a high piezoelectric property PZT film by densifying the film and reorienting the dipoles along the desired direction, respectively. However, these two steps are processed separately, which increases the duration and complexity of the process. Moreover, high temperature process limits the selection of electrode and substrate material to those with very high melting points. This paper experimentally demonstrates the feasibility of processing sintering and poling simultaneously providing a novel approach to prepare PZT film. Moreover, this paper investigates the effect of cyclic temperature excursions above and below the Curie temperature on the piezoelectric properties of PZT thick film. Photonic sintering with high intensity short duration pulsed flashes was used to fuse and merge PZT particles. Simultaneously, electrical poling field (20 kV/cm) was applied through the PZT film to reorient the PZT dipoles. The entire processing duration is less than 5 minutes. The resulted piezoelectric property of the PZT film was analyzed yielding high g33 (22.6 ×10-3 V-m/N), d33 (626 × 10-12 m/V), and permittivity (3130) indicating good sensing and actuating capabilities. This enhanced piezoelectric performance is superior to the groups of PZT films prepared using traditional process. This approach has potential applications for obtaining high performance piezoelectric devices, such as piezoelectric energy harvesters, memories, or bulk acoustic wave resonators.
关键词： piezoelectric,PZT,poling,photonic sintering,additive manufacturing,pulsed flash
更新于2025-09-04 15:30:14
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Study of Pb(Zr <sub/>0.52</sub> Ti <sub/>0.48</sub> )O <sub/>3</sub><scp>MEMS</scp> Piezoelectric Accelerometers for Health Monitoring of Mechanical Motors
摘要： In this study, piezoelectric (PZT) thick films were fabricated on Pt-coated Si substrates by a modified sol-gel method via dispersing the piezoelectric submicron powders of composition (Pb, Sr)Lax(Ti, Zr)1-1/4xO3 (PZT-5A, having a high d33 value of 520 and a high kp value of 0.64) in the PZT sol-gel solution. Then, piezoelectric microelectromechanical system (MEMS) accelerometers were designed and fabricated on Si substrates via micromachining techniques. A mathematic approximation model was firstly proposed. It used an effective thickness of Si membrane to replace the thickness of Si membrane, derived by math theory. The resonant frequency using the mathematic approximation model would be closer to the values of the experimental data than using the original math theory. Finally, the self-made thick film accelerometers with best properties were fabricated via a modified sol-gel method. They had voltage sensitivities in the range of 2.21~2.14mV/g, which is pretty high compared with the reported data, and the resonant frequency is in the range of 6.5~7.1 kHz. In addition, the accelerometers with amplifier circuit and power source were practically used in vibration detection of health monitoring of mechanical motors.
关键词： Piezoelectric thick film,Sol-gel,PZT-5A,MEMS,vacuum infiltration,Accelerometer
更新于2025-09-04 15:30:14