Effects of Sm-doping on microstructure, magnetic and microwave absorption properties of BiFeO3☆

来源 :稀土学报(英文版) | 被引量 : 0次 | 上传用户:b1035846306
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
In this paper, polycrystalline samples of Bi1-xSmxFeO3 (x = 0, 0.05, 0.1, 0.15) were successfully synthe-sized by sol-gel method. The effects of Sm concentration on the crystal structure, morphology, chemical states, magnetic properties and microwave absorption performance were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelec-tron spectroscopy (XPS), a vibrating sample magnetometer (VSM) and a Vector network analyzer (VNA), respectively. The results show that the rare earth Sm doping causes the crystal structure to change. When x≤0.1, Bi1-xSmxFeO3 is the distorted rhombohedral structure with space group R3c. With the increase of Sm doping amount to x = 0.15, the phase structure of Bi1-xSmxFeO3 changes from rhombohedral structure to cubic structure with the space group Pm(-3)m. The particle size decreases with the increase of the Sm doping amount. The analysis results show that Sm doping can effectively reduce the oxygen vacancies and significantly improve its magnetic properties. The results exhibit that moderately doped rare earth Sm element can effectively improve microwave absorption properties of Bi1-xSmxFeO3 pow-ders. When Sm doping amount of x is 0.1, the Bi0.9Sm0.1FeO3 compound has good microwave absorption performance, and the minimum reflection loss value of Bi0.9Sm0.1FeO3 powder reaches about-32.9 dB at 11.7 GHz, and its effective absorption bandwidth (RL < -10 dB) is 2.6 GHz with the optimal matching thickness of 2.0 mm.
其他文献
2016年4月19日,中共中央总书记、国家主席、中央军委主席、中央网络安全和信息化领导小组组长习近平在北京主持召开网络安全和信息化工作座谈会并发表重要讲话(以下简称"4·19"讲话)。这是一次具有特殊战略意义的重要讲话。
Removal feasibility of Fe impurity form La metal by electron beam melting(EBM) was analyzed,the removal mechanism was discussed,and the verification experiments were carried out in this study.The research results indicate that,the evaporation coefficient
最近投资买什么呢?比特币啊,老火了!可比特币在我国是不受法律保护的,而且还有不少诈骗分子琢磨着割韭菜呢。近期,公安机关打掉多起以投资比特币能获高额回报为诱饵的诈骗团伙,一起来看看吧。2021年1月初,安徽合肥肥西县公安局接到辖区群众李某报警称,其被网友以投资比特币为由诈骗。
The La-modified Cu-Mn spinel oxide was successfully coated onto honeycomb ceramic by a wash-coating method for complete catalytic decomposition of ethyl acetate
自习近平总书记在2016年网络安全和信息化工作座谈会议上的讲话发表以来的五年间,网络安全工作得到前所未有的重视。根据"十四五"规划纲要关于网络安全和信息化工作的战略部署,之前那种"不求有功但求无过"的思维已经行不通了。合规是基础,在这个基础上,政府和企事业单位需要有意识地做出改变,包括理念、技术、服务、运营等方面的变化。
2021年是中国共产党建党100周年,在习近平总书记2016年4月19日发表的网络安全和信息化工作座谈会重要讲话(以下简称"4·19"讲话)正确指引下,我国网络安全和信息化建设已经取得一定成就,但是,也需要看到,网络安全和信息化建设在快速发展的同时,也带来了不可忽视的安全威胁。网络空间安全的重要性被提升至新的历史高点,保护我国网络空间安全,成为保障国家长治久安的重要组成部分。
习近平总书记在2016年4月19日网络安全和信息化工作座谈会上发表讲话(以下简称"4·19"讲话),提出要树立正确的网络安全观。此后,习总书记站在党和国家事业发展全局的高度,准确把握信息化发展大势,科学分析新形势下网络安全呈现的新特点、新趋势,在多个场合就怎样看待网络安全、如何维护网络安全提出了一系列新思想、新观念和新论断,逐步形成了以网络主权观、国家观、发展观、法治观、人民观、国际观、辩证观为主
The influence of La2O3 inclusion (0-3 wt%) on the microstructure, phase formation and mechanical properties of zirconia toughed alumina (ZTA) added with 5.0 wt% C
Mesoporous Ce-Mn-Co ternary metal oxide was fabricated via an efficient oxalate-precursor-based soft reactive grinding route and used to activate H2O2 for advanced oxidation of methylene blue in water.In addition,Mn-Co binary oxide a
A series of TiO2-Al2O3 composites with Al/Ti molar ratios of 0.1, 0.2, and 0.4 were synthesized by a co-precipitation method and used as supports to prepare sup