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Lattice distortion and magnetic property of high entropy alloys at low temperatures

Journal of Materials Science & Technology 2022年第9期104卷 236-243页

作者： Yuan-Yuan Tan Zhong-Jun Chen Ming-Yao Su Gan Ding Min-Qiang Jiang Zhou-Can Xie Yu Gong Tao Wu Zhong-Hua Wu Hai-Ying Wang Lan-Hong Dai State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of Sciences&GraduateUniversity of Chinese Academy of SciencesBeijing 100049China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Zhejiang Institute of Mechanical&Electrical Engineering Hangzhou 310053China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Deformation mechanisms and magnetic properties of medium and high entropy alloys(MEA/HEAs)closely relate to lattice distortion and are strongly temperature-dependent,in particular,at low temperature ***,little attention has been paid to the evolution of lattice distortion with temperature decreasing and its effects on deformation behavior and magnetic state *** this work,we carry out in situ synchrotron radiation based X-ray powder diffraction(SR-XRD)experiments from 293 to 123 K aiming for determining lattice distortion evolutions of Cr Co Ni MEA,Cr Fe Co Ni and Cr Mn Fe Co Ni *** measurements at corresponding low temperatures and cryogenic ranges are further *** in situ SR-XRD results demonstrate a general reduction of lattice distortion magnitude with temperature decreasing,which shows a similar tendency with that of reported stacking fault energy(SFE)*** is thus suggested that lattice distortion reduction possibly makes a critical contribution to deformation mechanism *** magnetic measurement results show a clear ferromagnetic transition of Cr Fe Co Ni HEA when temperature is below 173 ***,no obvious magnetic state transition is observed for Cr Co Ni MEA and Cr Mn Fe Co Ni *** present findings on lattice distortion evolutions will pave the way for designing targeted HEAs with particular properties.

关键词： High entropy alloy Lattice distortion magnetic property Low temperature In situ SR-XRD

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Assembly of selenoniobate-vanadoniobate double-anion heteropolyoxoniobate:synthesis,structure,and magnetic property

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Tungsten 2023年第1期5卷 75-80页

作者： Zhi-Jie Liang Nan Li Hai-Bing Cheng Wei-Xin Du Guan Wang Dong-Di Zhang School of Textiles and Clothing Nantong UniversityNantong 226019China Henan Key Laboratory of Polyoxometalate Chemistry College of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China

Recently,continuous interests and persisting efforts on heteropolyniobate have been dedicated to its preparation and *** this work,a novel Se-centred heteropolyniobate,[H2SeNb12(VO)4O40][Cu(en)2]2{[VNb12(VO)4O40][Cu(en)2]4}0.5·39H2O(en=ethanediamine),was *** compound was synthesized in aqueous solution by reacting the K7HNb6O19·13H2O with a mixture of vanadate(Ⅴ) and selenite(Ⅳ) source,which consists of two polyanions,i.e.,V-centred one and Se-centred *** architecture was characterized by infrared spectra,thermogravimetric analysis,X-ray powder diffraction spectroscopy,ultraviolet-visible and X-ray photoelectron ***,the magnetic property shows the antiferromagnetic interaction of the compound.

关键词： Heteropolyniobate Crystal structure Double-anion Self-assembly magnetic property

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magnetic property and recording performance of chemical deposition CoP thin films

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Rare Metals 2012年第3期31卷 260-263页

作者： Wang, Haicheng Zhou, Qunfei Teng, Jiao Wang, Lijin Yu, Guanghua Department of Material Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

The thickness of CoP thin films prepared by wet chemical deposition is of crucial importance on magnetic property and recording performance. The coercivity of CoP films decreased with increasing film thickness. The coercivity was 45.37 kA·m−1 at the thickness of 300 nm, and decreased to 21.65 kA·m−1 at 5.7 μm. Recording performance tests indicate that, for drums with the same size, different recorded magnetic pole density have different thickness requirements. For 40 mm diameter magnetic drum, the optimal CoP thickness is 3∼10 μm for 256 recorded magnetic poles, 1∼2 μm for 512 recorded magnetic poles, and 500∼800 nm for 1024 recorded magnetic poles.

关键词： CoP thin films magnetic property magnetic recording

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magnetic property of a Three-dimensional Copper Metal-organic Framework

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Chinese Journal of Structural Chemistry 2018年第9期37卷 1486-1493页

作者：高玉洁田崇斌唐敬筱崔美艳周创宇冯美玲黄小荥 College of Chemistry Fuzhou University State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences College of Chemistry Fujian Agriculture and Forestry University

A copper metal-organic framework（MOF） compound based on 2,5-thiophenedicarboxylic acid（H2 TDC） ligand, namely Cu（TDC）（H2 O）？DMA（1, DMA = N,N？-dimethylacetamide）, has been synthesized in gram-scale via a one-pot solvothermal route in a high yield of 81.3%. Single-crystal X-ray analysis reveals that the structure of 1 features a three-dimensional（3D） open framework constructed by TDC interconnecting 1D chains of [-Cu（COO）（H2 O）Cu-]n. Thermal property was investigated by TG-MS. The magnetic measurements indicate the existence of weak antiferromagnetic interactions between the Cu2＋ centers in 1.

关键词： metal-organic framework copper solvothermal synthesis structure magnetic property

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Tridecanuclear Gd(III)-silsesquioxane:Synthesis,structure,and magnetic property

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ChemPhysMater 2022年第4期1卷 247-251页

作者： Kai Sheng Ran Wang Alexey Bilyachenko Victor Khrustalev Marko Jagodič Zvonko Jagličić Zhaoyang Li Likai Wang Chenho Tung Di Sun School of Aeronautics Shandong Jiaotong UniversityJinan 250037China School of Chemistry and Chemical Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology and School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252000China A.N.Nesmeyanov Institute of Organoelement Compounds Russian Academy of SciencesMoscow 119991Russia and Peoples’Friendship University of RussiaMoscow 117198Russia Peoples’Friendship University of Russia Moscow 117198Russia and Zelinsky Institute of Organic ChemistryRussian Academy of SciencesMoscow 119991Russia Institute of Mathematics Physicsand MechanicsLjubljana 1000Slovenia School of Materials Science and Engineering Nankai UniversityTianjin 300350China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049China

Polynuclear metal clusters,particularly those with aesthetically appealing structures,are of increasing *** this study,by employing C 4 symmetrical macrocyclic silsesquioxane ligand,a novel tridecanuclear Gd(III)cluster(Gd13)with a{Gd 13 O 8}core featuring unprecedent body-centered Archimedean cuboctahedron conformation is realized using an efficient solvothermal method instead of conventional Schlenk *** the best of our knowledge,Gd13 cluster is thus far the highest nuclearity of ***,a magnetic study reveals a weak antiferromagnetic interaction between adjacent Gd ions in the *** addition,Gd13 exhibits cryogenic magnetocaloric effects with a maximum−ΔS M value of 20 J kg^(−1) K^(−1) at 2 K andΔH=7.0 T.

关键词： Gd-silsesquioxane Crystal structure Archimedean solid magnetic property Magnetocaloric effects

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Hydrothermal Synthesis, Crystal Structure and magnetic property of a Novel Mixed Valence Decatungstate: [Cu(2,2′-bipy)_2]_2Na_2W_6~VW4^(VI)O_(30)·2H_2O

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Chinese Journal of Structural Chemistry 2008年第1期27卷 57-62页

作者：李涛海吕健高水英曹荣 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences

A novel Cu（II）-2,2＇-bipy-supported （bipy = bipyridine） mixed valence decatungstate, [Cu（2,2＇-bipy）2]2Na2W6^VW4^VIO30·2H2O 1, has been synthesized and structurally characterized by X-ray analysis. The crystal of 1 is of triclinic, space group P1^- with a= 10.9393（10）, b = 12.0492（2）, c = 12.3783（2）A, a = 80.631（10）, β= 70.226（10）, γ= 72.329（9）^o, V = 1459.64（4）A^3, Z = 1, Dc = 3.582 g/cm^3, F（000） = 1404, R = 0.0553 and wR = 0.1242 for 4607 observed reflections （I 〉 2σ（I））. The EPR spectrum of 1 indicates that its unpaired electrons are placed in the dx2-y2 orbital of the ground state of Cun. Furthermore, compound 1 shows an antiferromagnetic interaction.

关键词： crystal structure decatungstate mixed valence magnetic property

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Studies of short-time and high-temperature annealing and magnetic property of LaFe_(11.4)Si_(1.6) compound

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 390-398页

作者： Xiang CHEN Yungui CHEN Yongbo TANG School of Materials Science and Engineering Sichuan University Chengdu 610065 China Department of Physics and Electronic Informational Engineering Neijiang Teachers College Neijiang 641002 China

The LaFe11.4Si1.6 compounds are prepared by arc-melting and then annealed at different high temperatures from 1323 K （5 h） to 1623 K （2 h）. The powder X-ray diffraction （XRD） and microstructure observations show that large amount of 1：13 phase begins to appear in the LaFe11.4Si1.6 compound annealed at 1423 K （5 h）. In the temperature range from 1423 K to 1523 K, the α-Fe and LaFeSi phases rapidly decrease to form 1：13 phase. The LaFeSi phase is rarely observed by XRD when the as-cast compound is annealed at 1523 K （5 h）. With annealing temperature increasing to 1573 K, LaFeSi phase is detected again in LaFe11.4Si1.6 compound. In LaFe11.4Si1.6 compounds annealed at 1523 K （5 h）, at 1373 K （2 h）＋1523 K （5 h）, and 1523 K （7 h）＋1373 K （2 h）, the impurity phases including small amount of α-Fe and LaFeSi phase reduce in turn. The magnetic measurement shows that LaFe11.4Si1.6 compounds annealed by above three processes keep the first-order of magnetic transition behavior, and Tc are both at about 200 K. But the values of the maximal ASM（T, H） of has large difference, they are 9.94, 12.66, and 13.96 J/（kg.K） under a magnetic field of 0- 2 T, respectively.

关键词： LaFe11.4Sil.6 compound Short-time and high-temperature an-nealing Phase transition magnetic property

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AgCu(IO3)3：Synthesis,Crystal Structure and magnetic property

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Chinese Journal of Structural Chemistry 2017年第9期36卷 1456-1464页

作者：王文文阮婷婷徐翔毛江高 College of Chemistry Fuzhou University State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences

A new mixed metal iodate, namely Ag Cu（IO3）3, has been prepared using hydrothermal method. Ag Cu（IO3）3 crystallizes in the triclinic group P1 with a = 7.3063（6）, b = 7.8050（6）, c = 8.2447（6） A, α = 67.212（7）, β = 74.978（7）, γ = 80.972（7）°, V = 417.80（6） A^3 and Z = 2. The structure features one-dimensional [Cu（IO3）3]n^n- anionic chains that are separated by Ag~＋ cations. Such [Cu（IO3）3]n^n- chain is composed of [Cu2O（11）]n chain decorated by unidentate hanging and bidentate bridging iodate groups. Thermal study implies that Ag Cu（IO3）3 is thermally stable up to 460 oC and the optical measurement determined the optical band gap of 3.11 eV with a broad absorption band centered at 765 nm. magnetic investigations show that Ag Cu（IO3）3 is a soft ferromagnet.

关键词： metal iodate crystal structure magnetic property hydrothermal synthesis

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Direct hydrothermal synthesis and magnetic property of titanate nanotubes doped magnetic metal ions

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Journal of University of Science and Technology Beijing 2008年第5期15卷 644-648页

作者： Meili Wang Gongbao Song Jian Li Landong Miao Baoshu Zhang School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621002 China

Pure titanate nanotubes and titanate nanotubes doped with Fe^3＋/Ni^2＋/Mn^2＋ ions were synthesized by the hydrothermal method. In this process,titanate nanotubes were first prepared synchronously with doping Fe^3＋/Ni^2＋/Mn^2＋ ions. The morphology,structure,thermal stability and magnetic property of titanate nanotubes were characterized by X-ray diffraction （XRD）,transmission electron microscope （TEM）,and magnetic measurement. The titanate nanotubes transformed into the anatase titania nanocrystals,and further the mixture of anatase and rutile titania along with increasing temperature. The results indicate that the titanate nanotubes doped with Fe^3＋/Ni^2＋/Mn^2＋ ions are paramagnetic behaviors.

关键词： titanate nanotubes direct hydrothermal synthesis doping magnetic property

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Synthesis,Crystal Structure,Thermal Stability,Luminescence and magnetic property of a New Mn^Ⅱ Coordination Polymer

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Chinese Journal of Structural Chemistry 2018年第11期37卷 1834-1841页

作者：杨洪利陈芳贺雄黎燕张秀清 College of Chemistry and Bioengineering Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional MaterialsGuilin University of Technology

One new coordination polymer, [Mn(Hbtc)(bpy)(HO)]1, was synthesized by the reaction of manganese(Ⅱ) salt under pH-controlled hydrothermal conditions with unsymmetrical polycarboxylic acid of 1,2,4-benzenetricarboxylic acid(Hbtc) and 2,2?-bipyridine(bpy). The structure of complex 1 was characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray analysis, thermal gravimetric analysis(TGA), UV-Vis spectrometry, photoluminescence and magnetic susceptibility. Complex 1 is a one-dimensional(1D) polymeric single-chain structure. Photoluminescence property is quite similar to the bpy ligand. magnetic susceptibility measurement indicates that 1 shows a weak ferromagnetic coupling between the Mn~Ⅱ ions.

关键词： Mn~Ⅱ coordination polymer crystal structure 1,2,4-benzenetricarboxylic acid photoluminescence magnetic property

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