多种不可逆性对铁电埃里克森制冷循环性能的影响     

叶兴梅 《德州学院学报》2009,25(2):18-22

建立不可逆铁电埃里克森制冷循环模型,探索有限热源、热阻、固有的回热损失、附加的回热损失和工质内不可逆性等对制冷循环性能的影响,应用有限时间热力学方法,导出制冷率与制冷系数和输入功率间的优化关系解析表式,进而获得最大制冷率及其它优化性能参数．所得结论对实际铁电制冷机的优化设计和性能改善具有一定的参考价值．  相似文献   

功能陶瓷研究进展与发展趋势   总被引：13，自引：0，他引：13       下载免费PDF全文

董显林 《中国科学院院刊》2003,18(6):407-412

简要评述了陶瓷基板,微波介质陶瓷,铁电压电陶瓷,半导体陶瓷,铁电薄膜和智能材料等功能陶瓷的研究进展和发展趋势,对我院功能陶瓷的发展提出了一些建议。  相似文献   

Structures and electronic properties of domain walls in BiFeO3 thin films     

Huaixun Huyan  Linze Li  Christopher Addiego  Wenpei Gao  Xiaoqing Pan 《国家科学评论(英文版)》2019,6(4):669

Domain walls (DWs) in ferroelectrics are atomically sharp and can be created, erased, and reconfigured within the same physical volume of ferroelectric matrix by external electric fields. They possess a myriad of novel properties and functionalities that are absent in the bulk of the domains, and thus could become an essential element in next-generation nanodevices based on ferroelectrics. The knowledge about the structure and properties of ferroelectric DWs not only advances the fundamental understanding of ferroelectrics, but also provides guidance for the design of ferroelectric-based devices. In this article, we provide a review of structures and properties of DWs in one of the most widely studied ferroelectric systems, BiFeO₃ thin films. We correlate their conductivity and photovoltaic properties to the atomic-scale structure and dynamic behaviors of DWs.  相似文献   

基于铁电体移相器的相控阵天线设计     

钱林  周雁翎  戈海清 《中国科技信息》2011,(12):111-111,127

本文介绍了一种基于铁电体移相器的相控阵天线,该天线采用空馈形式,简化了天线结构,降低了天线成本,有利于相控阵技术的推广。  相似文献   

Topological domain states and magnetoelectric properties in multiferroic nanostructures     

Guo Tian  Wenda Yang  Deyang Chen  Zhen Fan  Zhipeng Hou  Marin Alexe  Xingsen Gao 《国家科学评论(英文版)》2019,6(4):684

Multiferroic nanostructures have been attracting tremendous attention over the past decade, due to their rich cross-coupling effects and prospective electronic applications. In particular, the emergence of some exotic phenomena in size-confined multiferroic systems, including topological domain states such as vortices, center domains, and skyrmion bubble domains, has opened a new avenue to a number of intriguing physical properties and functionalities, and thus underpins a wide range of applications in future nanoelectronic devices. It is also highly appreciated that nano-domain engineering provides a pathway to control the magnetoelectric properties, which is promising for future energy-efficient spintronic devices. In recent years, this field, still in its infancy, has witnessed a rapid development and a number of challenges too. In this article, we shall review the recent advances in the emergent domain-related exotic phenomena in multiferroic nanostructures. Specific attention is paid to the topological domain structures and related novel physical behaviors as well as the electric-field-driven magnetic switching via domain engineering. This review will end with a discussion of future challenges and potential directions.  相似文献   

低维结构铁电材料光电性能和铁电薄膜红外焦平面列阵器件物理研究     

于剑  褚君浩  汤定元 《中国科学院研究生院学报》2003,20(2):254-259

系统研究了晶粒尺寸对铁电性、相结构、晶格动力学和光致发光等性质的影响。研究了择优取向钛锆酸铅铁电薄膜异质结构的取向机理、光学常数以及电学性质,并采用建模的方法分析了影响铁电薄膜红外探测器的因素  相似文献   

烧结温度对0.68Pb(Mg_1/3Nb_2/3)O₃-0.32PbTiO₃陶瓷电学性能的影响     

王军军  郑立梅  杨彬 《石家庄学院学报》2012,14(6):5-9

采用固相反应法制备了准同型相界处的0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3陶瓷,探索了其最佳预烧温度,并研究了不同烧结温度下制备的陶瓷样品的微观形貌、致密度、铁电、压电性能.结果表明,样品的致密度和剩余极化随着烧结温度的升高而略有升高,矫顽电场随着烧结温度的升高而降低.烧结温度对样品的压电性能具有非常大的影响.1 200℃烧结的样品具有非常良好的压电性能:压电常数d33～560 pC/N,厚度振动机电耦合系数kt～54.0%,径向振动机电耦合系数kp～30.4%.  相似文献   

低维结构铁电材料光电性能和铁电薄膜红外焦平面列阵器件物理研究(英文)     

于剑  褚君浩  汤定元 《中国科学院大学学报》2003,20(2):254-259

系统研究了晶粒尺寸对铁电性、相结构、晶格动力学和光致发光等性质的影响.研究了择优取向钛锆酸铅铁电薄膜异质结构的取向机理、光学常数以及电学性质,并采用建模的方法分析了影响铁电薄膜红外探测器的因素.  相似文献