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Structure and magnetostriction of high Pr/Ce-content(Tb_(0.2)Pr_(0.8))_(1-x)Ce_(x)Fe_(1.93) Laves compounds

Journal of rare earths 2022年第4期40卷 670-675,I0006页

作者： Yihao Shen Jinjun Liu Qilin Ding Mingkun Wang Zhongbin Pan Juan Du Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

The light rare earth Pr/Ce-contained(Tb_(0.2)Pr_(0.8))_(1–x)Ce_(x)Fe_(1.93)(0≤x≤1.0)intermetallics were arc melted and magnetoelastic properties were investigated.The compounds of x≥0.40 are found to stabilize at ambient pressure in a single Laves phase with MgCu2-type C15 structure,which is attributed to the strong Ce 4f bonding.The mixed-valence behavior,with a support of the deviation from the linear Vegard’s law for both lattice parameter a and saturation magnetization M_(S),is observed at room temperature.The easy magnetization direction(EMD)was determined by the analysis of XRD on both magnetically aligned samples and the(440)splitting,that is,EMD lies towardaxis for x≤0.50 rotating tofor x=0.60,accompanied with the structural distortion from rhombohedral to orthorhombic.The substitution of Ce for Tb/Pr is conductive to the reduction of magnetocrystalline anisotropy,giving rise to an improvement of the low-field magnetostriction.The excellent magnetoelastic properties can be tailored by the Ce introduction,e.g.,the spontaneous magnetostriction coefficient λ_(111) as large as 1150×10^(−6) for x=0.40,and the low-field induced magnetostriction achieving a high value of λ_(a)=180×10^(−6) at 80 kA/m for x=0.60.The excellent magnetoelastic properties and the combination in high Pr-content with low cost,suggest promising prospects in applications.

关键词： light rare earth Intermetallics Laves phase X-ray diffraction Magnetic properties Magnetostriction

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Estimating REY content of eastern Kentucky coal samples based on their associated ash elements

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Journal of rare earths 2018年第11期36卷 1234-1238页

作者： S.Chehreh Chelgani James C.Hower Department of Electrical Engineering and Computer Science University of Michigan Center for Applied Energy Research University of Kentucky

Coal and coal combustion byproducts can be considered as an alternative source of rare earth elements and yttrium （REY）. The study of relationships between REY and other main coal properties could have several advantages such as estimating REY content of coal particles and designing beneficial extraction method. In this investigation, inter-correlations between REY content with coal parameters （proximate and ash elements） for a wide range of eastern Kentucky coal samples （708 records） were explored. Results demonstrate that zircon and monazite are the main source of heavy and light rare earth elements （HREE and LREE）, respectively. Zr has the highest correlation with Y and Th has the strength relationship with Ce and La. In general, LREE have higher interaction with coal ash content in comparison with HREE. Results indicated that REY can be estimated quite satisfactorily by using their associated elements in coal ash.

关键词： Coal Heavy rare earth light rare earth Proximate Ash elements

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Structure and magnetostriction of Tb_(0.4)Nd_(0.6)(Fe_(0.8)Co_(0.2))_(1.90) alloy prepared by solid-state synthesis

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rare Metals 2012年第6期31卷 547-551页

作者： Liu Jinjun Wang Rong Yin Hongyun Liu Xincai Si Pingzhan Du Juan Ningbo Univ State Key Lab Base Novel Funct Mat & Preparat Sci Fac Mat Sci & Chem Engn Ningbo 315211 Zhejiang Peoples R China China Jiliang Univ Coll Mat Sci & Engn Hangzhou 310018 Zhejiang Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Zhejiang Peoples R China

Mechanical alloying (MA) and subsequent solid sintering process was used to prepare the Nd-containing magnetostrictive Tb0.4Nd0.6-(Fe0.8Co0.2)1.90 alloy. The structure, thermal stability and phase transformation were investigated as functions of composition, milling process and annealing temperature. An amorphous phase was formed by high-energy ball milling for 5 h with the ball-to-powder weight ratio of 20:1, which crystallized into MgCu2-type and PuNi3-type crystalline structure with different annealing temperatures. The magnetoelastic properties were investigated by means of a standard strain technique. The high Nd-content (Tb,Nd)(Fe,Co)2 Laves phase for the composition Tb0.4Nd0.6(Fe0.8Co0.2)1.90 was synthesized by MA process plus annealing at 500 °C for 30 min.

关键词： mechanical alloying magnetostriction structure light rare earth

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