Comparison of the crystallographic and magnetic properties between Tb 2 Fe 16.46 Cr 1.23 and Tb 3 (Fe,Cr) 29 single crys
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Comparison of the crystallographic and magnetic properties between Tb2Fe16.46Cr1.23 and Tb3(Fe,Cr)29 single crystals C.P. Yanga) Department of Material Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China, and State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Y.Z. Wang State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China, and San Huan Research Laboratory, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080, People’s Republic of China
G.H. Wu State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
B.P. Hu San Huan Research Laboratory, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080, People’s Republic of China
X.F. Han State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Z.L. Jiang, C.L. Ma, and J. Zhu Department of Material Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China (Received 2 June 1999; accepted 12 August 1999)
A novel Tb3(Fe,Cr)29 single crystal, which has a monoclinic Nd3(Fe,Ti)29-type structure, is obtained using the Czochralski method by performing a proper heat treatment on the Tb2Fe16.46Cr1.23 crystal with a Th2Ni17-type structure. Thermomagnetic curves along the easy axis and magnetization curves along the easy and hard axes are presented for both crystals. The lattice parameters are a ⳱ 1.058 nm, b ⳱ 0.848 nm, c ⳱ 0.968 nm, ␣ ⳱ ␥ ⳱ 90°, and  ⳱ 96.93° for the Tb3(Fe,Cr)29 single crystal. The Curie temperatures, saturation magnetizations, and magnetocrystalline anisotropy constants are compared between the Tb-2:17 and Tb-3:29 crystals. The magnetization behavior along the hard axis is quite different as a first-order magnetization process (FOMP) of type I for the Tb-2:17, but a FOMP of type II for the Tb-3:29 crystal is observed below room temperature. At low temperatures, magnetohistory effects are detected for both crystals.
I. INTRODUCTION
The primitive studies on the 3:29 compounds began with the discovery of the novel metastable phase Y2(Fe0.91V0.09)17 reported by Ivanova et al. in 1990.1 A similar iron-based compound of Nd2(Fe,Ti)19 with a superstructure of the TbCu7-type was investigated by Collocott et al. in 1992. 2 The precise stoichiometry
a)
Address all correspondence to this author. e-mail: [email protected] J. Mater. Res., Vol. 14, No. 11, Nov 1999
http://journals.cambridge.org
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composition of the new Nd2(Fe,Ti)19 phase, which has a monoclinic structure and P21/c space group, was first considered as Nd3(Fe,Ti)29 by Li et al. using refinement x-ray diffraction in 1
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