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Elucidating elusive quaternary selenide EuCeCuSe3:Synthesis,crystal structure,properties and theoretical studies

Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim S.Molokeev Vladimir A.Chernyshev Aleksandr S.Aleksandrovsky Alexander S.Krylov Svetlana N.Krylova Nikolai P.Shestakov Dmitriy A.Velikanov Alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas Schleid Damir A.Safin Laboratory of Theory and Optimization of Chemical and Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation Department of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation Department of Photonics and Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and Educational and Innovation Center for Chemical and Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuSe3,the fabrication of which has been a challenge until this *** structure of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuSe3with excellent yield(96.7%)accompanied with a minor fraction of CeSe2(3.3%),and was best solved in orthorhombic space group Pnma with the BaLaCuS3structural ***,the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3(RE=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y),of which the cerium-based derivative exclusively belongs to the BaLaCuS3structural *** distortion of the CuSe4polyhedron was compared for the whole series of EuRECuSe3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the La3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3and *** initio calculations of the crystal structure,a phonon spectrum and elastic constants for the crystal of EuCeCuSe3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuSe3was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstrates the anisotropy of the elastic properties,while the Vickers hardness for EuCeCuSe3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide Synthesis Crystal structure Ab initio calculations magnetic measurements Spectroscopy

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Enhancing magnetic properties of anisotropic NdDyFeCoNbCuB powder by applying magnetic field at high temperature during hydrogen desorption

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Rare Metals 2010年第5期29卷 480-485页

作者： LUO Jianjun P. De Rango D. Fruchart MEI Jinna HU Rui LI Jinshan ZHOU Lian State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi'an 710072 China Matière Condensée Matériaux et Fonctions ( MCMF ) lnstitut Néel CNRS BP 166 38042 Grenoble Cedex 9 Francec Consortium de Recherches pour l'Emergence de Technologies Avancées ( CRETA ) CNRS BP 166 38042 Grenoble Cedex 9 France

Anisotropic powder was prepared with precursor （NdDy）-（FeCoNbCu）-B sintered magnets by hydrogen decrepitation, desorption, and subsequent annealing treatment. The hydrogen desorption was performed in magnetic fields of 0, 1, 3, and 5 T. The orientation of tetragonal phase grains of the powder was evaluated from the hysteresis loops measured by extraction magnetometer. Residual hydrogen content of the powder was evaluated by thermal-magnetic analysis. The powder with Hcj, Br, and （BH）max of 1138 kA.m^-1, 1.029 T, and 172.5 kJ.m^-3, respectively, was achieved under the condition of the magnetic field of 3 T. magnetic properties of the powder, especially, the remanence of the powder, are enhanced upon magnetic fields, which is due to better orientation of powder particles and less residual hydrogen in the powder resulted from the magnetic field during the hydrogen desorption process.

关键词： permanent magnets hydrogen absorbing materials anisotropy magnetic measurements magnetic properties

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Doping effect of rare-earth(lanthanum, neodymium and gadolinium) ions on structural,optical, dielectric and magnetic properties of copper nanoferrites

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Journal of Rare Earths 2018年第12期36卷 1299-1309页

作者： R. Rajesh Kanna K. Sakthipandi S.M.Seeni Mohamed Aliar Maraikkayar N. Lenin M. Sivabharathy Department of Physics Sethu Institute of Technology Department of Computer Science and Engineering Sethu Institute of Technology

Copper and rare earth-doped(RE = La, Gd, Nd) CuFe1.85RE0.15O4nano ferrites were prepared using the so nochemical method. The effective doping of rare-earth(La3+, Nd3+, Gd3+) ions with copper nanoferrites was confirmed by X-ray diffraction. The tetrahedral and octahedral sites of the nano ferrites were identified through the Fourier transform infrared spectra. The doping of rare-earth elements enhances the optical bandgap energy of the nanoferrites that are observed through Ultraviolet-DRS spectra. The oxidation state of the elements Cu 2 p, La 3 d, Nd 3 d, Gd 3 d, Fe 2 p and O 1 s was analyzed. Scanning electron microscopy images indicate a spherical morphology with agglomeration to some elongate. The values of dielectric constant and conductivity decrease considerably due to doping rare-earth ions in copper nanoferrites. Low saturation magnetization and high coercivity values of rare earth-doped copper nanoferrites are observed from the typical hysteresis curves.

关键词： Nanoferrites Optical properties Dielectric response magnetic measurements Rare earths

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Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al_2O_3 ceramics

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Chinese Physics B 2008年第9期17卷 3499-3504页

作者：焦志伟陈苗根姜伟棣冯春木叶高翔 Department of Physics Zhejiang University Department of Physics China Jiliang University Test and Analysis Center Zhejiang University

An iron film percolation system is fabricated by vapour-phase deposition on fracture surfaces of α-Al2O3 ceramics. The zero-field-cooled （ZFC） and field-cooled （FC） magnetization measurement reveals that the magnetic phase of the film samples evolve from a high-temperature ferromagnetic state to a low-temperature spin-glass-like state, which is also demonstrated by the temperature-dependent ac susceptibility of the iron films. The temperature dependence of the exchange bias field He of the iron film exhibits a minimum peak around the temperature T=5 K, which is independent of the magnitude of the cooling field Hcf. However, for T 〉 10K, （1） He is always negative when Hcf=2kOe and （2） for Hcf= 20 kOe （1Oe≈80 A/m）, He changes from negative to positive values as T increases. Our experimental results show that the anomalous hysteresis properties mainly result from the oxide surfaces of the films with spin-glass-like phase.

关键词： iron film ceramics exchange interactions magnetic measurements

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Effects of adding different types of carbon on the structure and magnetic properties of SmCo_(6.9)Hf_(0.1) alloy

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Journal of Rare Earths 2013年第12期31卷 1168-1174页

作者：孙继兵步绍静杨薇王洪水崔春翔何辰辉 Key Laboratory for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringHebei University of Technology

In this paper,SmCo6.9 Hf0.1 as-cast alloys and ribbons with the addition of either graphite（C） or carbon nanotubes（CNTs） were prepared by arc melting and melt-spinning,*** effects of adding carbon on the structure and magnetic properties SmCo6.9 Hf0.1 were investigated by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,magnetic force microscopy（MFM） and vibrating sample magnetometer（VSM）.It was found that the microstructure and magnetic structure of SmCo6.9 Hf0.1 ribbons were changed obviously due to the introduction of C or CNTs,although their crystal structure was characterized as the same Sm（Co,Hf）7 single phase,no matter carbon was added or *** a result,the magnetic properties of carbon-contained ribbons were enhanced in a certain *** was considered to be related to the refined equiaxed grains,small domain size and the pinning effect of C or CNTs-rich *** magnetic properties of SmCo6.9 Hf0.1（CNTs）0.05 ribbons reached Hc =12.5 kOe,Mr =57.0 emu/g and Mr/M2 T =0.788.

关键词： magnetically ordered materials rapid-solidification crystal structure magnetic measurements rare earths

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Crystal structure and magnetic properties of YbZn_(0.7)In_(1.3)

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Journal of Rare Earths 2011年第10期29卷 943-945页

作者： Yu.Verbovytskyy L.C.J.Pereira A.P.Gon alves Department of Chemistry Nuclear and Technological InstituteNational Rd.102686-953SacavémPortugal

The new ternary YbZn0.7Inl.3 compound was synthesized in evacuated quartz ampoules at 900 ℃, followed by annealing at 400 ℃. It crystallized in the UHg2 structure type with a=0.47934（5） nm, c=0.36955（5） nm, V=0.073535（15） nm3. The shortest distances between the atoms in this structure were equal to 0.3696 nm （Yb-Yb）, 0.3328 nm （Yb-M） and 0.2767 nm （M M）, respectively. Magnetization measurements indicated that the title compound exhibited a paramagnetic behavior down to 2 K, with antiferromagnetic-like interactions. Calculated magnetic moment for YbZn0.7inl.3 （μeft =3.86μB/Yb） could indicate mixed valence state of Yb.

关键词： ytterbium intermetallics crystal structure magnetic measurements rare earths

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Investigation of the crystal structure and magnetic properties of Nd_(3-x)GdxCo_(11)B_4 borides

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Journal of Rare Earths 2011年第5期29卷 466-470页

作者： Seluk Kervan Nazmiye Kervan Ayse zdemir Hseyin Szeri Nevsehir University Faculty of Arts and SciencesPhysics Department TUBTAK-UME National Metrology Institute

Polycrystalline samples of pseudo-ternary intermetallic Nd3–xGdxCo11B4 （x=0,1,2,3） borides prepared by standard arc-melting were characterized by X-ray powder diffraction （XRPD）,magnetization and differential scanning calorimetry （DSC） measurements. The X-ray diffraction patterns indicated the hexagonal Ce3Co11B4-type structure with P6/mmm space group for each composition. The substitution of Gd for Nd led to a decrease of the unit-cell parameters a and the unit-cell volume V,while the unit-cell parameter c increased linearly. magnetic measurements indicated that all samples were ordered magnetically below the Curie temperature. The Curie temperatures increased as Nd was substituted by Gd. The saturation magnetization at 4 K decreased upon the Gd substitution up to x=1,and then increased.

关键词： intermetallics magnetically ordered materials magnetic measurements rare earths

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Structure and magnetic Properties of S-doped Mn_3O_4/S Composited Nanoparticles and Mn_3O_4 Nanoparticles

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Journal of Materials Science & Technology 2011年第6期27卷 503-506页

作者： X. He Z.H. Wang D.Y. Geng Z.D. Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research and International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

Composited nanoparticles,consisting of Mn3O4,S-doped Mn3O4 and S,were synthesized by co-precipitation reaction and Mn3O4 nanoparticles were then obtained after removing the pure S from the composited *** Mn3O4-type phase with larger lattice constant a was formed by doping *** fixed temperatures below Curie temperature（TC）,the magnetization of the S-doped Mn3O4/S composited nanoparticles was smaller than that of the Mn3O4 *** blocking temperature was 36.3 and 34.8 K for Sdoped Mn3O4/S composite and Mn3O4 nanoparticles,*** anisotropy field of S-doped Mn3O4/S composite was determined to be about 55.3 kOe.

关键词： Nanostructured materials Chemical synthesis X-ray diffraction magnetic measurements

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Synthesis and room-temperature ferromagnetism in FeCo-and FeCu-codoped ZnO nanoparticles

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Journal of Chemistry and Chemical Engineering 2007年第1期1卷 1-7页

作者： CONG Chang-jie TANG Huai-jun ZHANG Ke-li College of Chemisty and Molecular Sciences Wuhan University Wuhan 430072 China Centre ofNanoscience and NanotechnologyResearch Wuhan University Wuhan 430072 China

Nanosized FeCo- and FeCu-codoped ZnO particles were synthesized by rheological phase reaction-precursor method and the thermal decomposition of oxalate precursors was studied by thermogravimetry and differential thermal analysis in air atmosphere. X-ray analysis revealed that the FeCo- and FeCu-codoped ZnO crystallize in a wurtzite structure. Further characterization by HRTEM showed that no FeCo, FeCu clusters and other secondary phases were found in the samples. X-ray photoelectron spectroscopy and absorption spectra results indicated that Fe and Cu were mainly likely to have nominal Fe3＋ and Cu＋ and Co successfully incorporated into the wurtzite configurations, 2＋ lattice at the Zn2＋ sites. Curie temperature above room temperatures was observed from the FeCo- and FeCu-codoped ZnO nanoparticles. The origin of the observed ferromagnetism in the FeCo- and FeCu-codoped ZnO nanoparticles can be explained by Ruderman-Kittel-Kasuya-Yosida-type exchange mediated under the conduction carriers and the double-exchange-like interaction, respectively.

关键词： semiconductors nanostructures X-ray diffraction magnetic measurements

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Bat Head Contains Soft magnetic Particles:Evidence From Magnetism

Bat Head Contains Soft Magnetic Particles:Evidence From Magn...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Lanxiang Tian,~1 Wei Lin,~1Shuyi Zhang,~2and Yongxin Pan~(1*) 1 Biogeomagnetism Group,Paleomagnetism and Geochronology Laboratory, Key Laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing,China 2 School of Life Sciences,East China Normal University,Shanghai,China

Recent behavioral observations have indicated that bats can sense the Earth’s magnetic field. To unravel the magnetoreception mechanism,the present study has utilized magnetic measurements on three migratory species(Miniopterus fuliginosus,Chaerephon plicata,and Nyctalus plancyi)and three non-migratory species(Hipposideros armiger,Myotis ricketti,and Rhinolophus ferrumequinum). Room temperature isothermal remanent magnetization acquisition and alternating-field demagnetization showed that the bats’ heads contain soft magnetic *** analyses indicated that the saturation isothermal remanent magnetization of brains(SIRM)of migratory species is higher than those of non-migratory ***,the SIRMof migratory bats is greater than their ***-temperature magnetic measurements suggested that the magnetic particles are likely magnetite(FeO).This new evidence supports the assumption that some bats use magnetite particles for sensing and orientation in the Earth’s magnetic field.

关键词： bat magnetoreceptor magnetic measurements migratory non-migratory

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