压电晶体Al1—xGaxPO4的生长及其特性

用缓慢升温法成功研制出非铁电性二元系压电新晶体Ａｌ０．８８Ｇａ０．１２ＰＯ４，通过原子光谱吸收，Ｒｕｔｈｅｒｆｏｒｄ背散射及Ｘ射线粉末衍射测定其组分结构，并给出了新晶体和电弹常数和温度系数。     

锥形阀压电薄膜泵的初步研究

提出一种适应高频工作状态的压电薄膜泵结构，实步分析了所采用的锥形阀的工作原理与作用，设计了试验泵结构，加工了样机，通过试验证明了锥形阀的有效性，为进一步的研究打下了基础。     

压电主动杆位置和增益在随机智能桁架结构振动控制中的优化

对结构物理参数、几何尺寸、作用荷载和控制力同时具有随机性时 ,随机压电智能桁架结构中主动杆的配置位置和闭环控制系统增益进行了优化 ,基于系统最小储存能 ,构建了具有动应力、动位移可靠性约束的主动杆配置和控制增益的优化模型 ;并对结构动力响应的数字特征进行了推导。通过算例 ,验证了该优化配置模型的合理性和有效性 ,获得了若干有意义的结论。     

新型后坐加速度开关阵列传感器

分析了国外后坐加速度传感器发展动向。介绍了新型后坐加速度开关阵列传感器的结构、原理、参数选择和性能设计。给出了原理性静态、动态试验结果，以证明新方案的可行性。最后指出了这种新型结构的传感器所具有的特点。     

“双驱动足”回转式压电马达初步研究

提出一种“双驱动足”回转式压电马达，分析了其工作原理，并根据工作原理，设计，研制了样机，进行了初步的试验研究，证明工作原理基本正确，为今后进一步研究提供了参考依据。     

3D Printing of Polyvinylidene Fluoride Based Piezoelectric Nanocomposites: An Overview

Recently, polyvinylidene fluoride (PVDF) based nanocomposites have attracted much attention for next-generation wearable applications such as promising piezoelectric energy harvesters (nanogenerators), energy storage devices, sensing devices, and biomedical devices due to their high flexibility, and high dielectric and piezoelectric properties. 3D printing technology, PVDF based piezoelectric nanocomposites, the studies based on 3D printing of PVDF based piezoelectric nanocomposites by inkjet printing and fused deposition modeling, and enhancements of energy harvesting and storage performance of nanocomposites by structural design are comprehensively overviewed here. An insight is provided into 3D printing techniques, structure and properties of PVDF based polymers, various nanofillers and production methods for nanocomposites, solutions to enhance β phase (crystallinity) of PVDF, and improvements of nanocomposites’ breakdown strength, discharged energy density, and piezoelectric power output by mentoring structural design.     

Synergistic Effect of PVDF-Coated PCL-TCP Scaffolds and Pulsed Electromagnetic Field on Osteogenesis

Bone exhibits piezoelectric properties. Thus, electrical stimulations such as pulsed electromagnetic fields (PEMFs) and stimuli-responsive piezoelectric properties of scaffolds have been investigated separately to evaluate their efficacy in supporting osteogenesis. However, current understanding of cells responding under the combined influence of PEMF and piezoelectric properties in scaffolds is still lacking. Therefore, in this study, we fabricated piezoelectric scaffolds by functionalization of polycaprolactone-tricalcium phosphate (PCL-TCP) films with a polyvinylidene fluoride (PVDF) coating that is self-polarized by a modified breath-figure technique. The osteoinductive properties of these PVDF-coated PCL-TCP films on MC3T3-E1 cells were studied under the stimulation of PEMF. Piezoelectric and ferroelectric characterization demonstrated that scaffolds with piezoelectric coefficient d₃₃ = −1.2 pC/N were obtained at a powder dissolution temperature of 100 °C and coating relative humidity (RH) of 56%. DNA quantification showed that cell proliferation was significantly enhanced by PEMF as low as 0.6 mT and 50 Hz. Hydroxyapatite staining showed that cell mineralization was significantly enhanced by incorporation of PVDF coating. Gene expression study showed that the combination of PEMF and PVDF coating promoted late osteogenic gene expression marker most significantly. Collectively, our results suggest that the synergistic effects of PEMF and piezoelectric scaffolds on osteogenesis provide a promising alternative strategy for electrically augmented osteoinduction. The piezoelectric response of PVDF by PEMF, which could provide mechanical strain, is particularly interesting as it could deliver local mechanical stimulation to osteogenic cells using PEMF.     

掺杂对PZT压电陶瓷的影响及研究进展

在介绍掺杂PZT压电陶瓷材料制备的基础上,总结出生产掺杂PZT材料的最佳掺杂条件,以及配方对压电陶瓷性能的影响,只要工艺合适,性能完全能再提高,对压电陶瓷材料的发展趋势进行了展望。     

Effects of CeO2 doping on the structure and properties of PSN-PZN-PMS-PZT piezoelectric ceramics

Quinary system piezoelectric ceramics PSN-PZN-PMS-PZT were prepared by using a two-step method. The effects of CeO2 doping on piezoelectric and dielectric properties of the system were investigated at morphotropic phase boundary （MPB）. The results reveal that the relative dielectric constant ε33^T｜ε0, the Curie temperature To, the piezoelectric constant d33, the mechanical quality factor Qm, and the electromechanical coupling coefficient Kp are changed with the increase of CeO2 content. On the other hand, the effects of CeO2 doping on the dielectric properties of PSN-PZN-PMS-PZT piezoelectric ceramics at high electric field are consistent with the change at weak electric field. The values of dielectric constant and dielectric loss are enhanced with the increasing of electric field.     

纳米粉及添加剂对压电陶瓷材料性能的影响

采用高能球磨法研磨出PZT-5纳米粉料，添加外购的纳米有机添加剂，按照传统的固相工艺法制备出了压电陶瓷材料，研究分析纳米粉料和纳米有机添加剂对压电陶瓷性能的影响。通过测试分析可以看出，纳米压电粉料与纳米有机添加剂的综合作用，降低了材料的烧结温度、相对介电常数εr,Qm值和以d31，提高了压电应变常数d333，从而压电电压常数g33、gh、dh成倍提高，这些对制作宽带、高灵敏度的换能器是很有好处的。