【摘 要】
：
Nominal (Li0.5Ce0.5)x(Na0.5Bi0.5)(1-x)Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bis
论文部分内容阅读
Nominal (Li0.5Ce0.5)x(Na0.5Bi0.5)(1-x)Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bismuth layer-structured phase and perovskite phase was determined in these ceramics using XRD technique. At room temperature, the x=0.11 sample showed the largest piezoelectric constant, d33, of about 26.5 pC/N and the largest electromechanical coupling factor, kt, of about 30%. Even after annealing at 500 ℃, the value of d33 was still about 19 pC/N, in x=0.08-0.11 samples. Moreover, these composite ceramics showed low temperature coefficients of dielectric constant and high electrical resistivity in the temperature region of 450-550 ℃. These results indicated that (Li, Ce) modified NaBi5Ti5O18 composite ceramics were promising piezoelectric materials for high-temperature applications.
其他文献
随着城市化进程的不断推进，人类的生存空间不断扩大，对生态环境的影响也不断增长。在这些影响作用下，野生动物生存环境、与人类的关系、行为习性等方面呈现出了新的特征变化，野生
目的：围绕玉米生产以高产、优质、高效的主题，结合实际，从我县玉米品种资源中选择具有一定潜力的玉米新品种，通过比较试验，选出适合我县不同地域的玉米种子，为我县玉米高产创建栽培
采用高温固相法合成了掺杂改性的锂离子电池用尖晶石型LiMn2-x-yCoxLayO4-zClz和复合型LiMn2-x-yCoxLayO4-zClz/C正极材料.通过X射线衍射和环境扫描电镜对材料的晶体结构和表
以粉末冶金夹杂裂纹扩展寿命预测理论为基础,建立了裂纹扩展可靠性分析的剩余强度干涉模型与寿命干涉模型.采用改进一次二阶矩法分析单个夹杂裂纹扩展的可靠性.为了分析多个
Microstructures of as-cast Al-Mg-Si-Mn alloys with and without Sc and Zr were investigated by optical microscopy, scanning electronic microscopy(SEM) and energy
LiCaBO3:Eu3+ phosphor was synthesized by high solid-state reaction method, and its luminescent characteristics were investigated. The emission and excitation sp
The limiting length of tunnels, llim, of Al foil electro-etched in HCl-H2SO4 solution and the corresponding anodic polarization curves in the same solution were
Uniform nanoparticles of molybdenum nitride were synthesized by temperature-programmed reaction(TPR) using MoO3 and ammonia as reactants. This material was char
YBCO textured thick film was prepared by direct periteetic growth method. Microstructure of the film was characterized. Electron backscattered diffraction (EBSD
Hydrogen absorption and desorption charactersfics for high coereivity NdDyFeCoNbCuB sintered bulk magnets were studied, by differential scanning calorimetry (DS