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magnetic properties of melt-spun ribbons(Sm1-xZrx)(Fe0.92Ti0.08)10 with Thmn12 structure and their hydrides

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Journal of Rare Earths 2019年第10期37卷 1066-1071页

作者： A.G.Popov A.V.Protasov V.S.Gaviko D.A.Kolodkin P.B.Terentev E.G.Gerasimov Tianli Zhang Chengbao Jiang m.n.miheev institute of metal physics of ural branch of russian academy of sciences Str.S.Kovalevskoy18 Ekaterinburg620990Russia institute of natural sciences and mathematics Ural Federal Universitypr.Mira19 Ekaterinburg620002Russia School of materials Science and Engineering Beihang UniversityBeijing 100191China

The structure and magnetic hysteresis properties of the cast Sm1-xZrx(Fe0.92Ti0.08)10(x = 0-0.3)alloys and melt-spun ribbons prepared from them were *** the cast alloy with x>0.2, a considerable amount of the eutectic phase is found in the SEm *** of the temperature dependences of the magnetic susceptibility and XRD patterns allows amorphous state in the as-spun ribbons with x>0.2 to be *** specific magnetization measured in a field of 17 kOe and remanence decrease with increasing annealing temperature from 800 to 900 ℃ and weakly depend on Zr *** maximal value of coercivity Hc = 4.7 kOe is obtained on the ribbons with x = 0.2 after annealing at 850℃ for 10 *** additional hydrogenation of the ribbons,both the coercivity and remanence increase by 54% and 7%,respectively.

关键词： Sm-Zr-Fe-Ti Thmn12 melt-spun ribbons Hydrogenation magnetic properties

Development of high-coercivity state in melt-spun Fe41Pd41B8Si6P4 ribbons

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Rare metals 2020年第1期39卷 76-83页

作者： Oksana Aleksandrovna Golovnia nina Ivanovna Vlasova Aleksandr Gervasievich Popov Vasiliy Semenovich Gaviko Vladimir Vladimirovich Popov Jr. Andrey Vladimirovich Protasov Arti Kashyap m.n.miheev institute of metal physics of ural branch of russian academy of sciences EkaterinburgRussia620990 institute of natural sciences and mathematics Ural Federal UniversityEkaterinburgRussia620002 Israel institute of metals Technion R&D FoundationTechnion City3200003HaifaIsrael Indian institute of Technology mandi KamandMandiHP175005India

The phase transformation and magnetic hysteresis properties of melt-spun Fe41 Pd41 B8 Si6 P4 ribbons subjected to the annealing at temperatures of 500-550℃were studied after holding for 0.1-60.0 h by transmission electron microscopy(TEm),X-ray diffraction(XRD)and thermomagnetic *** additions of P,B and Si to the FePd alloy allowed us to achieve the coercivity of124 kA·m-1,which is 2.6 times higher than that of the melt-spun ribbons of the binary equiatomic FePd *** high-coercivity Fe41Pd41B8 Si6 P4 alloy is nanocrystalline and is composed of the ordered L10-phase grains approximately 40 nm in size and inclusions of the Fe2(P,B)and Pd2(Si,B)*** coercivity kinetics is controlled by the phase transformation which can be divided into three stages:transformation from the bcc structure to nanosized regions of the fee and Fe2 P phases;transformation from the fee to L10 nanosized regions with somewhat different degrees of tetragonality and their ordering;and extensive growth of the weight fraction of L10 phase from the fee nanosized regions.P and B atoms occupy interstitial sites in the iron plane of L10 lattice,thus decreasing its Curie temperature(TC).

关键词： Fe-Pd-P-B-Si melt spinning L10 nanostructured materials Phase transformation magnetic measurements

Einstein Probe discovery of EP240408a: A peculiar X-ray transient with an intermediate timescale

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Science China(physics,mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong Chen nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang Bing Zhang Chen Zhang Shuang-nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong Li Bifang Liu mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee maitra Alessio marino Itumeleng monageng Kirpal nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin Chengkui Li Junfei Li Longhui Li maoshun Li Wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia ma Xuan mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu national Astronomical Observatories Chinese academy of sciences School of Astronomy and Space sciences University of Chinese academy of sciences Key Laboratory of Particle Astrophysics institute of High Energy physics Chinese academy of sciences institute of Space sciences (ICE) CSIC Institut d’Estudis Espacials de Catalunya (IEEC) max Planck institute for Extraterrestrial physics Innovation academy for microsatellites Chinese academy of sciences Department of physics University of Hong Kong School of physics and Astronomy University of Leicester School of physics and Astronomy Sun Yat-sen University Department of physics Anhui normal University Shanghai institute of Technical physics Chinese academy of sciences physics Department Tsinghua University nevada Center for Astrophysics University of nevada Las Vegas Department of physics and Astronomy University of nevada Las Vegas South African Astronomical Observatory Department of Astronomy University of Cape Town Department of physics University of the Free State Université Paris Cité CnRS Astroparticule et Cosmologie Université Paris Cité CEA Paris-Saclay IRFU/DAp-AIm Department of Astronomy Guangzhou University Cosmic Dawn Center (DAWn) niels Bohr institute University of Copenhagen Department of physics and Astronomy Rutgers the State University of new Jersey institute for Cosmic Ray Research The University of Tokyo ESA/ESTEC Department of Astronomy School of physics Huazhong University of Science and Technology InAF-Osservatorio Astrofisico di Torino Sydney institute for Astronomy School of physics The University of Sydney Department of Astronomy Xiamen University institute for Frontiers in Astronomy and Astrophysics Beijing normal University Department of Astronomy University of Science and Technology School of Astronomy and Space sciences University of Science and Technology of China institute of Deep Space sciences Deep Space Exploration Laboratory Department of Astronomy School of physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chi

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,nICER,GROnD,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 ke V,～300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and nICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 ke V,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for ～4 d,followed by a steep decay till becoming undetectable ～10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of～10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients ${\bm~{Einstein~~Probe}}$

Correlation of microstructure and magnetic properties in Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets solution-treated at different temperatures

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Rare metals 2019年第1期38卷 20-28页

作者： Cheng Xu Hui Wang Tian-Li Zhang Alexander Popov Raghavan Gopalan Cheng-Bao Jiang School of materials Science and Engineering Beihang University m.n. miheev institute of metal physics Ural Branch of Russian Academy of Sciences International Advanced Research Centre for Powder metallurgy and new materials(ARCI) IITM Research Park

The correlation of microstructure and magnetic properties in Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets solution-treated at different temperatures was systematically investigated. It is found that the magnets solution-treated at 1219℃ possess a single 1:7 H phase, exhibiting the homogeneous cellular structure during further aging treatment, leading to the optimum magnetic properties. However, for the magnets solution-treated at 1211 and 1223℃,2:17 H or 1:5 H secondary phase will also form besides 1:7 H main phase, which cannot transform into cellular structure,thus deteriorating the magnetic properties greatly. The irreversible magnetization investigations with recoil loops also propose a non-uniform pinning in the magnets induced by the secondary precipitates. At proper solution temperature, Zr is supposed to occupy the Fe-Fe dumbbell sites in the form of Zr-vacancy pairs, leading to the minimum c/a ratio and thus stabilizing the 1:7 H phase. Finally,Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets with the maximum energy product and intrinsic coercivity at 550℃ up to 60.73 kJ·m^(-3) and 553.88 kA·m^(-1) were prepared by powder metallurgy method.

关键词： Sm2Co17 Solution treatment Phase constitution Demagnetization curve squareness

Coercivity kinetics upon step annealing of sintered Sm(Co0.88-xFexCu0.09Zr0.03)7 magnets

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Journal of Rare Earths 2019年第10期37卷 1059-1065页

作者： A.G.Popov O.A.Golovnia A.V.Protasov V.S.Gaviko D.A.Kolodkin R.Gopalan m.n.miheev institute of metal physics of ural branch of russian academy of sciences Str.S.Kovalevskoy18Ekaterinburg620990Russia institute of natural sciences and mathematics Ural Federal Universitypr.MiraEkaterinburg19620002Russia International Advanced Research Centre for Powder metallurgy and new materials(ARCI) IITM Research ParkChennai 600113India

Behavior of the coercivity of the high-temperature Sm(Co0.88-xFexCu0.09Zr0.03)7 magnets depending on the temperature and time of annealing with the temperature decreasing stepwise from 700 to 400℃ was *** is shown that the growth rate of coercivity abruptly increases at the initial stage of annealing in the vicinity of the Curie temperature of the SmCo5 *** origin of the effect is the counter diffusion of Cu and Co atoms through dislocation tubes,which form because of enhanced stresses and a partial breakage of coherent coupling at the interface of the Sm2 Co17 and SmCo5 *** enrichment of the SmCo5 phase in Cu close to the interface with Sm2 Co17 leads to relaxation of stresses and increases in the gradient of the magnetic domain-wall energy and coercivity.

关键词： Sm-Co-Fe-Cu-Zr Permanent magnet Sm2Co17 SmCo5 Coercivity kinetics

Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings

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International Journal of minerals,metallurgy and materials 2021年第9期28卷 1469-1477页

作者： Alexander m.Klyushnikov Rosa I.Gulyaeva Evgeniy n.Selivanov Sergey m.Pikalov institute of metallurgy of the ural branch of the russian academy of sciences Yekaterinburg 620016Russia

X-ray powder diffraction,scanning electron microscopy,energy dispersive spectroscopy,thermogravimetry,differential scanning calorimetry,and mass spectrometry have been used to study the products of nickel-containing pyrrhotite tailings oxidation by oxygen in the *** kinetic triplets of oxidation,namely,activation energy(E_(a)),pre-exponential factor(A),and reaction model(f(α))being a function of the conversion degree(α),were adjusted by regression *** case of a two-stage process representation,the first step proceeds under autocatalysis control and ends atα=*** kinetic triplet in the first step is E_(a)=262.2 kJ/mol,lg A=14.53 s^(−1),and f(α)=(1-α)^(4.11)(1+1.51×10^(-4)α).For the second step,the process is controlled by the two-dimensional diffusion of the reactants in the layer of oxidation *** kinetic triplet in the second step isЕa=215.0 kJ/mol,lg A=10.28 s^(−1),and f(α)=(-ln(1-α))^(-1).The obtained empirical formulae for the rate of pyrrhotite tailings oxidation reliably describe the macro-mechanism of the process and can be used to design automatization systems for roast-ing these materials.

关键词： pyrrhotite tailings oxidation thermogravimetry kinetics mechanism

Universal Fermi velocity in highly compressed hydride superconductors

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matter and Radiation at Extremes 2022年第5期7卷 71-78页

作者： Evgeny F.Talantsev m.n.miheev institute of metal physics Ural BranchRussian Academy of Sciences18S.Kovalevskoy St.Ekaterinburg 620108Russia and NANOTECH CentreUral Federal University19 Mira St.Ekaterinburg 620002Russia

The Fermi velocity vF is one of the primary characteristics of any conductor,including any *** conductors at ambient pressure,several experimental techniques have been developed to measure vF,and,for instance,Zhou et al.[nature 423,398(2003)]reported that high-Tc cuprates exhibited a universal nodal Fermi velocity vF,univ=(2.7±0.5)×10^(5) m/***,there have been no measurements of vF in highly compressed near-room-temperature superconductors(nRTS),owing to experimental ***,to answer the question of the existence of a universal Fermi velocity in nRTS materials,we analyze the full inventory of data on the ground-state upper critical field Bc2(0)for these materials and find that this class of superconductors exhibits a universal Fermi velocity vF,univ=(1/1.3)×[2Δ(0)/kBTc]×10^(5) m/s,whereΔ(0)is the ground-state amplitude of the energy *** ratio 2Δ(0)/kBTc varies within a narrow range 3.2≤2Δ(0)/kBTc≤5,and so vF,univ in nRTS materials lies in the range 2.5×10^(5) m/s≤vF,univ≤3.8×10^(5) m/s,which is similar to the range of values found for the high-Tc cuprate counterparts of these materials.

关键词： materials. Fermi superconductors

Thermal efficiency of the principal greenhouse gases

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Chinese physics B 2015年第1期24卷 195-200页

作者： A.Y.Galashev O.R.Rakhmanova institute of Industrial Ecology Ural Branch Russian Academy of Sciences Yekaterinburg 620990 Russia

Atmospheric gases are ranked according to the efficiency with which they absorb and radiate longwave radiation. The open international HITRAn database of gaseous absorption lines of high resolution together with inverse Fourier transform were used. The autocorrelation functions of the total dipole moment of the basic greenhouse gases molecules such as H2 O,CO2, O3, n2 O, and CH4 were obtained. Absorption coefficient spectra and emission power spectra of infrared radiation of these gases were calculated. Analysis of the emissive ability of all gases under consideration was carried out. Compared to CO2, all the gases under investigation have more effective emission except ozone. An efficiency criterion of IR absorption and emission is defined and is calculated for each studied gas, and the gases are ranked accordingly as follows（from strong to weak）： H2 O, CH4, CO2, n2 O, and O3.

关键词： greenhouse gases absorption and emission spectra efficiency criterion

mechanical strains in pecvd Sin_x:H films for nanophotonic application

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Chinese physics B 2015年第10期24卷 395-399页

作者： O.Semenova A.Kozelskaya Li Zhi-Yong Yu Yu-De Rzhanov institute of Semiconductor physics Siberian Branch of Russian Academy of Sciences institute of Strength physics and materials Science Siberian Branch of Russian Academy of Sciences institute of Semiconductors Chinese Academy of Sciences

Hydrogenated amorphous silicon nitride films（Si n x：H） are deposited at low temperature by high-frequency plasmaenhanced chemical vapor deposition（HF PECVD）. The main effort is to investigate the roles of plasma frequency and plasma power density in determining the film properties particularly in stress. Information about chemical bonds in the films is obtained by Fourier transform infrared spectroscopy（FTIR）. The stresses in the Si n x：H film are determined from substrate curvature measurements. It is shown that plasma frequency plays an important role in controlling the stresses in Si n x：H films. For silicon nitride layers grown at plasma frequency 40.68 mHz initial tensile stresses are observed to be in a range of 400 mPa-700 mPa. measurements of the intrinsic stresses of silicon nitride films show that the stress quantity is sufficient for film applications in strained silicon photonics.

关键词： silicon photonics intrinsic stress amorphous silicon nitride films