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| 1 | Effect of wheel speed on phase formation and magnetic properties of (Nd_(0.4)La_(0.6))-Fe-B melt-spun ribbons显示文摘The effect of wheel speed on phase formation and magnetic properties of(Nd_(0.4)La_(0.6))_(15)Fe_(77.5)B_(7.5) and(Nd_(0.4)La_(0.6))_(13.4)Fe_(79.9)B_(6.7) ribbons prepared by me It-spinning method was investigated experimentally.Based on X-ray diffraction results, all melt-spun ribbons consist of the main phase with the tetragonal 2:14:1 type structure and the minor a-Fe phase. Magnetic measurements show the maximum magnetic energy product((BH)_(max)) and the remanence(M_r) increases firstly and then decreases with the increase of wheel speed, while the coercivity(H_(ci)) increases, resulting from the variation of the average volume fraction of the a-Fe phase and the average grain size in the melt-spun ribbons. Using Henkel plots, the interaction between the 2:14:1 phase and the a-Fe phase in the melt-spun ribbons was analyzed and the intergranular exchange coupling is manifested. Optimal magnetic properties of H_(ci) = 7.27 kOe,Mr = 90,94 emu/g and(BH)_(max) = 12.10 MGOe are achieved in the(Nd_(0.4)La_(0.6))_(15)Fe_(77.5)B_(7.5) ribbon with the wheel speed of 26 m/s. It indicates that magnetic properties of Nd-Fe-B melt-spun ribbons with highly abundant rare earth element La can be improved by optimizing alloy composition and preparation process. | Liang Wang Jiang Wang Maohua Rong Guanghui Rao Huaiying Zhou | 2018 | Journal of Rare Earths2018，36，11： | 4 |
| 2 | Phase diagrams of permanent magnet alloys: Binary rare earth alloy systems显示文摘Thermodynamic optimization of the binary rare earth alloy(Cee La, Cee Pr, Cee Nd and Lae Nd) systems was performed in this work through the CALPHAD method based on the critical evaluation of all available phase diagram and thermodynamic data reported in the literature. During the thermodynamic modeling, the solution phases including liquid, bcc, fcc and dhcp, were treated as the substitutional solution model. Thermodynamic parameters of the stable phases in the Cee La, Cee Pr, Cee Nd and Lae Nd binary systems are obtained finally and would be used directly to develop the thermodynamic database of the multi-component Nde Fee B-based alloys, which is indispensable for designing alloy compositions and processes of Nde Fee B permanent magnets with highly abundant rare earth metals. | Kaicheng Yang Jiang Wang Qingrong Yao Zhao Lu Maohua Rong Huaiying Zhou Guanghui Rao | 2019 | Journal of Rare Earths2019，37，10： | 3 |
| 3 | Effects of Sm-doping on microstructure,magnetic and microwave absorption properties of BiFeO_(3)显示文摘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 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 photoelectron 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,Bi_(1-x)Sm_(x)FeO_(3) is the distorted rhombohedral structure with space group R3c.With 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 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 Bi_(1-x)Sm_(x)FeO_(3) powders.When 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. | Chuang Tian Qingrong Yao Zhaofei Tong Huaiying Zhou Guanghui Rao Jianqiu Deng Zhongmin Wang Jiang Wang | 2021 | Journal of Rare Earths2021，39，7： | 3 |
| 4 | Hydrogen storage properties and thermal stability of a- morphous Mg70 (RE25 Ni75 )30 alloys 显示文摘 | Chen Hexin Wang Zhongmin Zhou Huaiying | 2013 | J Alloys Compd2013，563，： | 1 |
| 5 | Electrochemical performances of Mm 0.7 Mg x Ni 2.58 Co 0.5 Mn 0.3 Al 0.12 ( x显示文摘 | Chengyuan Ni Huaiying Zhou Nianlei Shi Zhongmin Wang | 2011 | Electrochimica Acta2011，，： | 1 |
| 6 | Preparation of monodispersed tin-doped indium oxide powders by hydrothermal method显示文摘 | Xu Huarui Zhu Guisheng Zhou Huaiying | 2005 | Journal of the American Ceramic Society2005，88，4： | 1 |
| 7 | 显示文摘 | Xu Huarui Zhu Guisheng Zhou Huaiying | 2005 | Journal of the American Ceramic Society2005，88，4： | 1 |
| 8 | Prepara- tion of monodispersed tin-doped indium oxide nanopowders under moderate conditions显示文摘 | Xu Huarui Zhu Guisheng Zhou Huaiying | 2005 | Mater Lett2005，59，1： | 1 |
| 9 | Improvement in magnetic properties,corrosion resistance and microstructure of Nd-Fe-B sintered magnets through intergranular addition of Tb_(68)Ni_(32)显示文摘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 resistance.In 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 investigated.The 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 sintering.The 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 decreases.After 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 grain.Moreover,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. | Jia Li Qingrong Yao Weichao Huang Jue Xie Zhilin Mo Jianqiu Deng Jiang Wang Guanghui Rao Huaiying Zhou | 2022 | Journal of Rare Earths2022，40，5： | 1 |
| 10 | Effect of sintering conditions on the formation of single-phase NdMgNi4 compound and its hydrogen storage properties 显示文摘 | Wang Z M Huaiying Zhou | 2007 | Journal of Alloys and Compounds2007，429，12： | 1 |
| 11 | Effect of heat treatment on hydrogen storage properties and thermal stability of V_(68)Ti_(20)Cr_(12) alloy显示文摘Effect of heat treatment on the crystal structure, microstructure, hydrogen storage properties and thermal stability of V_(68)Ti_(20)Cr_(12) alloy prepared by arc-melting was studied in this work. It was found that both the as-cast and annealed(973 K/72 h) V_(68)Ti_(20)Cr_(12) alloys consisted of a single body-centered cubic(bcc) phase. After heat treatment, the hydrogen absorption/desorption kinetic characteristics of the as-cast alloy was improved greatly due to the homogeneous composition and perfect structure. The mechanism of hydrogen absorption/desorption process in the as-cast and annealed alloys was further investigated according to the Johnson-Mehl-Avrami(JMA) equation. The hydrogen absorption process of the as-cast and annealed alloys would be controlled by the one-dimensional diffusion process, while the hydrogen desorption process in the as-cast and annealed alloys was dominated by the geometrical contraction model. The pressure-composition-temperature(PCT) measurements show that the plateau pressure of the annealed alloy becomes comparatively flat. Furthermore, the activation energies of the dehydrogenation in the as-cast and annealed alloys were calculated using the Kissinger method, indicating that heat treatment is a very beneficial way to improve hydrogen absorption/desorption kinetics of the alloy. | Maohua Rong Feng Wang Jiang Wang Zhongmin Wang Huaiying Zhou | 2017 | Progress in Natural Science:Materials International2017，27，5： | 1 |
| 12 | Effect of doping ions on electrochemical properties of LiFePO4 cathode 显示文摘 | Huaiying Zhou Tianlong Gu Daoguo Yang | 2011 | Advanced Materials Research2011，，： | 1 |
| 13 | 显示文摘 | Xu Huarui Zhu Guisheng Zhou Huaiying | 2005 | Journal of the American Ceramic Society2005，88，4： | 1 |
| 14 | Structural stability of single-layered LaNi_4.25Al_0.75 film and its electro-chemical hydrogen-storage properties显示文摘AB5-based hydrogen storage thin films (LaNi4.25Al0.75), deposited on Cu substrate by dc magnetron sputtering were investigated in this study. X-ray diffraction (XRD) revealed that the microstructure of the layer was in crystal form. SEM and AFM analyses proved that the film appeared to be rather rough with numerous randomly sized pores of approxi- mately 15-40 in nm diameter. Structural stability of the film was examined by the combined analyses of DSC, XRD, and SEM, which indicated that this film maintained its structural stability below 500 K or so, and a network structure was ob- served on the film after being heated at 700 K for 30 min. Electrochemical hydrogen-storage properties of the films were investigated by simulated battery tests. It was found that single-layered LaNi4.25Al0.75 film exhibited electrochemical hydro- gen-storage properties similar to typical AB5 alloys in bulk, and the maximum discharge capacity of the film was about 220 mAh/g. After 20 charge/discharge cycles, small needle-shaped aluminium oxide was formed on some fractions of the film surface. | WANG Zhongmin Chi Ying Vanessa Li ZHOU Huaiying Sammy Lap Ip Chan SHI Liu | 2006 | Rare Metals2006，25，5： | 0 |
| 15 | Effect of Er_(30)Cu_(70) on microstructure and properties of sintered Nd-Fe-B by grain boundary reconstruction显示文摘Usually it is generally believed that the Er element forms the Er_(2)Fe_(14)B phase,which will seriously deteriorate the magnetic properties.Distinctly,here we report the balance of corrosion resistance and coercivity in Nd-Fe-B sintered magnets through using simple Er_(30)Cu_(70) additive whose price is much lower than Dy and Tb.By reasonably controlling Er_(30)Cu_(70) addition,the corrosion resistance is improved at the minimum limit of reducing the magnetic properties.Through studying the influence mechanism of Er element,it is found that the main effect of Er elements is to replace the Nd elements at the edge of the main phase grains to form a(Er,Nd)_(2)Fe_(14)B shell with low H_(A),resulting in the reduction of magnetic properties.The improvement of corrosion resistance mainly comes from the more stable Cu element introduced at the grain boundary.At the same time,the target magnets also show different advantages under different heat treatment methods.Above findings may spur progress towards developing the lowcost permanent magnets that rival the commercial Nd-Fe-B counterpart. | Kai Wang Yongtao Dai Jianqiu Deng Jiang Wang Huaiying Zhou Qingrong Yao Weichao Huang | 2024 | Journal of Rare Earths2024，42，2： | 0 |
| 16 | Influence of A-site doping barium on structure,magnetic and microwave absorption properties of LaFeO_(3)ceramics powders显示文摘In this paper,the effect of Ba^(2+)ions A-site doping LaFeO_(3)on structure,magnetic properties and microwave absorption properties was investigated by the sol-gel method.According to the TEM and FullProf refinement results,the structure of LaFeO_(3)changes from orthogonal(SG:Pnma)to cubic(SG:Pm-3 m)when the Ba doping amount is x=0.4.The SEM image shows that the particles size tends to decrease with the increase of Ba content.The production of weak ferromagnetism indicates that Ba doping has a significant effect on the magnetic properties of LaFeO_(3).The Neel temperature(TN)decreases significantly with the increase of Ba doping amount.An appropriate amount of Ba doping can effectively increase the dielectric and magnetic loss of LaFeO_(3)ceramics powders.The increase permittivity(ε’andε″)may be attributed to the hopping of the electrons between the Fe^(3+)and Fe^(4+)ions with the Ba^(2+)ions doping.The minimum reflection loss(RL_(min))of La_(0.9)Ba_(0.1)FeO_(3)at 6.72 GHz reaches-30.04 dB,its effective bandwidth(RL≤-10 dB)is 2.1 GHz,and the matching thickness is only 3.2 mm.These results indicate that Ba doping can effectively control the microwave absorption properties of LaFeO_(3),especially in the Cband. | Lei Huang Lichun Cheng Shunkang Pan Qingrong Yao Qianxin Long Man Wang Yucheng Chen Huaiying Zhou | 2022 | Journal of Rare Earths2022，40，7： | 0 |
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