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Effects of Sm-doping on microstructure,magnetic and microwave absorption properties of BiFeO_(3)

Journal of Rare Earths 2021年第7期39卷 835-843,I0003页

作者： Chuang Tian Qingrong Yao Zhaofei Tong Huaiying Zhou guanghui rao Jianqiu Deng Zhongmin Wang Jiang Wang School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

In this paper,polycrystalline samples of Bi_(1-x)Sm_(x)FeO_(3)(x=0,0.05,0.1,0.15) were successfully synthesized by sol-gel *** 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 photoelectron spectroscopy(XPS),a vibrating sample magnetometer(VSM) and a Vector network analyzer(VNA),*** results show that the rare earth Sm doping causes the crystal structure to *** x≤0.1,Bi_(1-x)Sm_(x)FeO_(3) is the distorted rhombohedral structure with space group *** the increase of Sm doping amount to x=0.15,the phase structure of Bi_(1-x)Sm_(x)FeO_(3) changes from rhombohedral structure to cubic structure with the space group Pm3 *** particle size decreases with the increase of the Sm doping *** analysis results show that Sm doping can effectively reduce the oxygen vacancies and significantly improve its magnetic *** results exhibit that moderately doped rare earth Sm element can effectively improve microwave absorption properties of Bi_(1-x)Sm_(x)FeO_(3) *** Sm doping amount of x is 0.1,the Bi_(0.9)Sm_(0.1)FeO_(3) compound has good microwave absorption performance,and the minimum reflection loss value of Bi_(0.9)Sm_(0.1)FeO_(3) powder reaches about-32.9 dB at11.7 GHz,and its effective absorption bandwidth(RL <-10 dB) is 2.6 GHz with the optimal matching thickness of 2.0 mm.

关键词： BiFeO_(3) Crystal structure Magnetic properties Microwave absorption Reflection loss Rare earths

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Magnetic properties and large magnetocaloric effects of GdPd intermetallic compound

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Journal of Rare Earths 2018年第10期36卷 1044-1049页

作者： Jianjun Huo Yusong Du Gang Cheng Xiaofei Wu Lei Ma Jiang Wang Zhengcai Xia guanghui rao School of Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004 China Guangxi Key Laboratory of Information Materials Guilin 541004 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technoogy Wuhan 430074 China

With the intention to explore excellent magnetocaloric materials, the intermetallic compound GdPd was synthesized by arc melting and heat treatment. The microstructure, magnetic and magnetocaloric properties of the intermetallic compound of GdPd were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and the physical property measurement system（PPMS）. A large reversible magnetocaloric effect is observed in GdPd accompanied by a second order magnetic phase transition from paramagnetism to ferromagnetism at ～39 K. The paramagnetic Curie temperature（θp） and the effective magnetic moment（μ（eff））are determined to be 34.7 K and 8.12 μB/Gd,respectively. The maximum entropy change（｜△SM（Max）｜） and the relative cooling power（RCP） under a field change of 5 T are estimated to be 20.14 J/（kg·K） and 433 J/kg, respectively. The giant reversible magnetocaloric effects（both the large△SM and the high RCP） together with the absence of thermal and field hysteresis make the GdPd compound an attractive candidate for low-temperature magnetic refrigeration.

关键词： CdPd compound Magnetocaloric effect Magnetic entropy change Magnetic refrigeration material Rare earths

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Improvement in magnetic properties,corrosion resistance and microstructure of Nd-Fe-B sintered magnets through intergranular addition of Tb_(68)Ni_(32)

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Journal of Rare Earths 2022年第5期40卷 784-791,I0004页

作者： Jia Li Qingrong Yao Weichao Huang Jue Xie Zhilin Mo Jianqiu Deng Jiang Wang guanghui rao Huaiying Zhou Guangxi Key Laboratory of Information Materials School of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China China Rare Metals and Rare Earth(Guangxi)Jinyuan New Materials Co. Ltd.Hezhou 542603China

New energy vehicles and offshore wind power industries have a high demand for sintered Nd-Fe-B magnets with high intrinsic coercivity and high corrosion *** this study,the magnetic properties,anticorrosion properties,and micro structure of Nd-Fe-B sintered magnets with the intergranular addition of low-melting-point eutectic Tb_(68)Ni_(32) alloy powders were *** aim is to determine if the addition of Tb_(68)Ni_(32) can improve these properties.A low melting-point eutectic alloy Tb_(68)Ni_(32) powders was prepared as a grain boundary additive and blended with the master alloy powders prior to *** coercivity of the resultant magnets gradually increases from 1468 to 2151 kA/m by adding increasing amounts of Tb_(68)Ni_(32).At the same time,the remanence first increases and then slightly *** studying the microstructure and elemental composition of the Tb_(68)Ni_(32) added magnets,it is found that the significant increase in coercivity and the negligible reduction in remanence is due to densificatio n,improved grain orientation,a unifo rm and continuous boundary phase distribution,as well as the generation of a(Nd,Pr,Tb)_(2) Fe_(14)B "core-shell" structure surrounding the main-phase ***,the corrosion resistance of the magnet is greatly improved owing to the enhancement of electrochemical stability,as well as the optimization of the distribution and morphology of the intergranular phase.

关键词： Nd-Fe-B sintered Magnets Tb_(68)Ni_(32)alloy Magnetic properties Corrosion resistance Microstructure Rare earths

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Enhanced piezoelectric properties and thermal stability of Bi_(0.5)Na_(0.5)TiO_(3)modified BiFeO_(3)-BaTiO_(3)ceramics with morphotropic phase boundary

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Journal of Materiomics 2023年第3期9卷 464-471页

作者： Shuai Cheng Boping Zhang Shengjie Ai Hongbao Yu Xin Wang Jiahao Yang Changrong Zhou Jingtai Zhao guanghui rao Guangxi Key Laboratory of Information Materials&School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Foshan(Southern China)Institute for New Materials Foshan528200GuangdongChina School of Materials Science and Engineering Shanghai UniversityShanghai200444China School of Materials Science and Engineering University of Science and Technology Beijing100083BeijingChina

Morphotropic phase boundary(MPB)plays a key role in tuning piezoelectric responses of ferroelectric ***,Bi_(0.5)Na_(0.5)TiO_(3)modified BiFeO_(3)-BaTiO_(3)ternary solid solutions of 0.7BiFeO_(3)-(0.3-x)BaTiO_(3)-xBi_(0.5)Na_(0.5)TiO_(3)(referred to as BF-BT-xBNT,0.00≤x≤0.04)were prepared for lead-free *** the ceramics exhibit an MPB with coexisting rhombohedral(R)and tetragonal(T)phases,and the R/T phase ratio decreases upon increasing *** increment of BNT promotes the grain growth,lowers the leakage current and Curie temperature(TC),and gradually drives the ferroelectric to relaxor *** of the MPB with appropriate R/T phase ratio,increased grain size and density,and decreased leakage current,the well-balanced performance between d_(33)=206 pC/N and TC=488℃is obtained in x=0.01 *** addition,the further enhanced in-situ d_(33)=286e347 pC/N is obtained in BF-BT-xBNT ceramics along with the improved depolarization temperature T_(d)from 280 to 312℃,showing a potential application for lead-free piezoceramics at high temperature.

关键词： Ferroelectrics Piezoelectric property Curie temperature Phase transitions Thermal stability

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Photocurrent density and electrical properties of Bi0.5Na0.5TiO3–BaNi0.5Nb0.5O3 ceramics

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Journal of Advanced Ceramics 2021年第5期10卷 1119-1128页

作者： Mingqiang ZHONG Qin FENG Changlai YUAN Xiao LIU Baohua ZHU Liufang MENG Changrong ZHOU Jiwen XU Jiang WANG guanghui rao Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology College of Material Science and Engineering Guilin University of Electronic Technology School of Resources Environment and Materials Guangxi University Nanning 530004 China dInstitute of Physics Chinese Academy of Sciences

In this work,the （1–x）Bi0.5Na0.5Ti O3–x Ba Ni0.5Nb0.5O3（BNT–BNN;0.00≤x≤0.20）ceramics were prepared via a high-temperature solid-state *** crystalline structures,photovoltaic effect,and electrical properties of the ceramics were *** to X-ray diffraction,the system shows a single perovskite *** samples show the normal ferroelectric *** the increase of BNN content,the remnant polarization （Pr） and coercive field （Ec）decrease *** optical band gap of the samples narrows from 3.10 to 2.27 e *** conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen *** open-circuit voltage (Voc) of～15.7 V and short-circuit current (Jsc) of～1450 n A/cm2are obtained in the 0.95BNT–0.05BNN ceramic under 1 sun illumination （AM1.5G,100 m W/cm2）.A larger Vocof 23 V and a higher Jscof 5500 n A/cm2are achieved at the poling field of 60 k V/cm under the same light *** study shows this system has great application prospects in the photovoltaic field.

关键词： Bi0.5Na0.5TiO3-BaNi0.5Nb0.5O3 ferroelectric semiconductors optical band gap photovoltaic effect impedance spectroscopy

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Effects of thermal and electrical histories on structure and dielectric behaviors of(Li_(0.5)Nd_(0.5))^(2+)-modified(Bi_(0.5)Na_(0.5))TiO_(3)-BaTiO_(3) ceramics

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Journal of Materiomics 2017年第2期3卷 121-129页

作者： Jiwen Xu Qingning Li Ling Yang Weidong Zeng Changrong Zhou Changlai Yuan Guohua Chen guanghui rao Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilinGuangxi541004China

The effect of thermal and electrical histories on structure and dielectric behaviors is studied using 0.95(Bi_(0.5)Na_(0.5))_(0.97)(Li_(0.5)Nd_(0.5))_(0.03)TiO_(3)-0.05BaTiO_(3)(abbreviated as BNTLN0.03-BT5)ceramic as a selected *** structure change caused by annealing treatment,and pronounced phase transition and domain switching by electrical poling,are observed to occur,*** dielectric constant and its strong frequency dispersion in unpoled samples decrease evidently by electrical poling due to electric field-induced ordered *** high temperature Maxwell-Wagner relaxor behavior vanishes by annealing treatment due to the loss of electrical inhomogeneity with interface charging *** properties are improved evidently by annealing treatment at 900℃,implying a new appropriate method to improve piezoelectric properties.

关键词： Ceramics Dielectric properties Ferroelectricity Piezoelectricity

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An Effectual Way to Construct Phase Diagrams

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工程科学学报 1991年第2期 154-161页

作者： Qiao Zhiyu Liang fingkui rao guanghui (Department of Physical Chemistry) Institute of Physics, Academia Sinica, Beijing Academia Sinica Beijing Institute of Physics

It is described that the effectual way to construct phase diagrams is the combination of computer calculation with some critical measurements. Examples of application to the CuO-RE2O3 (RE. La, Y, Nd), Na2 B2O4, K2B2O4... 详细信息

关键词： phase diagram computer calculation DTA

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Resistance Behaviour of Nanocrystal Nickel

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Journal of Materials Science & Technology 1993年第3期9卷 185-189页

作者： Jirong SUN Yingzi ZHANG guanghui rao Yong LIU Shichao LIU Institute of Physics,Academia Sinica,Beijing,100090,China

The resistance behaviour of nanocrystal nickel was studied from 4 to 720 K and 0 to 20 Kbar.A linear variation of the resistance was found at low *** showed that under high temperatures, that system transformed to a more stable state,with the relaxation process taking place by stages and influenced by exerted *** property,especially the stability,of nanocrystal was closely re- lated to the compacting pressure,

关键词： nanocrystal interface grain boundary relaxation resistance electronic structure

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Effects of cobalt substitution on structure and microwave absorption properties of PrNi_5 alloy

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Journal of Rare Earths 2015年第12期33卷 1324-1328页

作者：潘顺康熊吉磊成丽春姚青荣饶光辉 School of Material Science and Engineering Guilin University of Electronic Technology Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology School of Materials Science and Engineering Central South University

The polycrystalline samples PrNi5_xCox （x=0.0, 0.1, 0.2, 0.3, 0.4） were synthesized by arc smelting and high energy ball milling method. The phase structure, morphology, saturation magnetization and electromagnetic parameters of the alloy powders were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, vibrating sample magnetomctry （VSM） and vector network analyzer （VNA）, respectively. The results revealed that the lattice parameter a and c and unit-cell volume V increased with the increasing amount of Co substitution. The saturation magnetization increased as Co content increased. The minimum absorp- tion peak frequency shifted towards lower frequency region with the increasing amount of Co substitution. And the minimum reflec- tion loss of the PrNi5 xCox powders increased first and then decreased with the increasing amount of Co substitution. The PrNisCox alloys possessed the excellent microwave absorbing properties. The minimum reflection loss of the ***0,1 alloy all could reach 20.0 all3 with the coating thickness ranging from 1.8 to 3 ram. The minimum reflection loss of ***.l powders was -36.20 d13 at 7.76 GHz, and the frequency bandwidth ofR〈10 dB reached about 1.50 GHz with the best matching condition d=2.0 ram.

关键词： PrNi5 alloy Co substitution structure electromagnetic parameters microwave absorbing properties rare earths

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稀土富过渡族金属化合物的形成条件、晶体结构和磁性能(Ⅱ)

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中国稀土学报 2012年第4期30卷 513-524页

作者：骆军梁敬魁饶光辉北京凝聚态物理国家实验室(筹) 中国科学院物理研究所北京100190

稀土(R)富过渡族金属(T)化合物是探索新型稀土永磁材料的主要研究对象,其磁性能与晶体结构密切相关。本文系统综述了我们近年来针对二元化合物不存在的情况下,通过第三组元M的稳定作用,合成和稳定具有CaCu5型衍生结构的化合物Rm-nT5m+2n... 详细信息

稀土(R)富过渡族金属(T)化合物是探索新型稀土永磁材料的主要研究对象,其磁性能与晶体结构密切相关。本文系统综述了我们近年来针对二元化合物不存在的情况下,通过第三组元M的稳定作用,合成和稳定具有CaCu5型衍生结构的化合物Rm-nT5m+2n(包括R(T,M)7,R2(T,M)17,R3(T,M)29和R(T,M)12),具有NaZn13型结构的化合物R(T,M)13,以及m层RT5和n层RT3B2组合的化合物Rm+nT5m+3nB2n等方面的主要研究结果。重点讨论了这些化合物的晶体结构、形成条件和磁性能,阐述了加入M对化合物的稳定作用机制,及M的晶体学占位对磁性能的影响。研究结果表明:M的加入不仅能够起到稳定化合物的作用,往往还可以显著改善化合物的磁性能。

关键词：稀土富过渡族金属化合物晶体结构相稳定磁性能

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