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1.
本文研究了用金属有机物热发解法制备PLT8薄膜的工艺过程和基片对薄膜结构的影响,并且给出了铁电性能的测量结果。 相似文献
2.
用金属有机化合物制备铁电薄膜:工艺及进展 总被引:2,自引:0,他引:2
本文概述了以金属有机化合物为原料制备铁电薄膜的工艺过程、工艺特点及最新研究进展,着重介绍了金属有机物化学气相溶积(MOCVD),金属有机物热分解(MOD)以及溶胶-凝胶(Sol-Gel)三种制备技术在铁电薄膜制备领域中的应用。 相似文献
3.
K. Daoudi T. Tsuchiya I. Yamaguchi T. Manabe S. Mizuta T. Kumagai 《Journal of Electroceramics》2006,16(4):527-532
Epitaxial La0.7Ca0.3MnO3 (LCMO) thin films were successfully prepared by the metal-organic deposition process on various (001) single-crystal substrates:
MgO, LaAlO3 (LAO), SrTiO3 (STO), and (LaAlO3)0.3-(SrAlTaO6)0.7 (LSAT). The crystallinity and the epitaxial growth of the LCMO films were characterized by X-ray diffraction (θ − 2θ scans
and pole-figure analysis). The temperature dependence of the resistance of the LCMO/LSAT, LCMO/STO and LCMO/LAO films exhibit
typical characteristics with a transition from the paramagnetic-insulator state to the ferromagnetic-metallic state at a temperature
peak (T
p
) ranging from 258 to 270 K. However, the LCMO/MgO films exhibited a semiconducting behavior without any transition. Based
on the R(T) measurement, we calculated the temperature coefficient of resistance (TCR) for a bolometric application and we obtained
22%/K, 10.2%/K and 27.5%/K for the film grown on the LSAT, STO and LAO substrates, respectively. This difference in the TCR
properties is related to the strain induced by the lattice mismatch between LCMO and the different substrates. 相似文献
4.
5.
Abstract This paper presents the singular stress analysis near the apex of a structure formed during dental restoration of a premolar class II cavity. Based on the elasticity theory, the stresses may go to infinity at the junctions of different materials (e.g. dentine, enamel, restoration materials). Tensions will cause material separation and then material fracture. In order to reduce the failure probability, the degree of stress concentration has to be reduced. The stress singularity order and the stress intensity factor are two parameters, which are often used in fracture analysis. The objective of this paper is to find conditions such that non‐singular stress fields are possible. Three critical positions in the restoration structure are discussed. They are the tips of interface between (1) enamel and restoration; (2) dentine and restoration; and (3) enamel, dentine and restoration. In the last two cases, the restoration may be bonded or debonded to enamel or dentine. After employing Kolosov‐Muskhelishvili complex functions together with the eigenfunction expansion method, the singularity orders are computed theoretically. Weak stress singularity conditions can be sought by properly selecting cutting angles or restoration materials. 相似文献
6.
Guo Pei Zhao Xiaohui Xiong Jie Xia Yudong Jing Tongguo Chen Jue Zhang Ning Zhang Fei Tao Bowan Li Yanrong State Key Laboratory of Electronic Thin Films Integrated Devices University of Electronic Science Technology of China Chengdu China 《稀有金属材料与工程》2011,(Z3)
In this study,a simple template consisted of Y2O3 and La2Zr2O7 (LZO) layers was fabricated on rolling assisted biaxially textured Ni-5at%W substrates for YBa2Cu3O7-δ (YBCO) coated conductors.A thin sputtered Y2O3 layer (~20 nm) was introduced as a seed layer in order to induce epitaxial growth of metal organic deposited LZO layer.The effects of Y2O3 layer,annealing temperature and dwelling time on the phase and texture of the LZO films were systematically investigated.X-ray diffraction exhibited that the LZ... 相似文献
7.
金属有机物热分解法制备锆钛酸铅薄膜研究 总被引:1,自引:0,他引:1
采用金属有机物热分解(MOD)法,通过对原料的提纯和合成工艺的优化,消除原料中的微量杂质,控制环境温度,从而获得了透明、稳定的锆钦酸铅先体溶液.锆铁酸铅先体溶液经过多次成膜,在Pt/SiO2/Si基片上制备出厚度为0.6um,均匀、无裂纹、无针孔的薄膜.经550℃保温处理后,得到假立方晶系的钙钦矿结构的薄膜.借助扫描电镜形貌分析表明,其晶粒大小约为2~3μm. 相似文献
8.
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10.
通过对石家庄站西广场的售票厅在春运时期的运行状况进行调查,发现其售票服务效率不高,影响旅客的满意度.针对上述问题,提出一种排队论和工业工程相结合的改善方案.该方案结合系统成本、服务效率和旅客需求等因素,利用排队理论分析车站在春运期间的负荷状况,运用工业工程中的模特法对问题实施优化改善,最后借助WinQSB软件对比得到车站在春运期间不同客流量下的合适的服务窗口需求量,并进行了敏感性分析.研究表明,工业工程的应用可以很好地提高售票服务效率、旅客满意度和服务质量,有助于合理规划现有资源,降低车站的运营成本,增强铁路部门的综合实力. 相似文献