Study on the microstructure and magnetic properties of Sm–Fe–Ti alloys and their nitrides

Sm 2Fe 17− x Ti x N compounds were prepared from the starting Sm 2Fe 17− x Ti x alloy by nitrogenation processes for 2, 4, 6 and 10 h. The microstructure and crystal lattice parameters of the Sm 2Fe 17− x Ti x N system were presented in detail. The main phase of all Sm 2Fe 17− x Ti x N (with x=0, 0....

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Bibliographic Details
Published in:	Physica. B, Condensed matter Vol. 351; no. 1; pp. 151 - 157
Main Authors:	Cui, Chunxiang, Sun, Jibing, Li, Yanchun, Wang, Ru, Liang, Zhimei, Shen, Yutian, Greer, A.Lindsay
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 15-08-2004 Elsevier
Subjects:	Alloys Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Curie temperature Domain effects, magnetization curves, and hysteresis Exact sciences and technology Lattice parameters Magnetic properties Magnetic properties and materials Magnetization curves, hysteresis, Barkhausen and related effects Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects Microstructure Nitriding Physics Sm 2Fe 17− xTi xN Structure of solids and liquids; crystallography Structure of specific crystalline solids Nitriding Sm 2Fe 17− x Ti x N Microstructure Lattice parameters Magnetic properties Curie temperature Samarium alloys Curie point Sm2Fe17-xTixN Iron alloys Nitrides Titanium alloys Nitridation Rare earth alloys Nitrogen additions Transition element alloys Saturation magnetization Crystal structure
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Summary:	Sm 2Fe 17− x Ti x N compounds were prepared from the starting Sm 2Fe 17− x Ti x alloy by nitrogenation processes for 2, 4, 6 and 10 h. The microstructure and crystal lattice parameters of the Sm 2Fe 17− x Ti x N system were presented in detail. The main phase of all Sm 2Fe 17− x Ti x N (with x=0, 0.5, 1.0 and 2.0) compounds behave the Th 2Zn 17-type structure, tiny α-Fe, SmFe 2, FeTi, Fe 2Ti phases may coexist. Ti dissolves into three different phases: Sm 2(Fe,Ti) 17, Fe x Ti and α-Fe(Ti). With increasing Ti content, corresponding characteristic peaks of Sm 2Fe 17− x Ti x shift to lower angles and the increment (Δ V/ V) of unit cell volume for Sm 2Fe 15Ti 2 were increased up to 3.898%. However, the deviation amplitude Δ2 θ for the same sample was nearly not changed with the increasing of 2 θ angle from 20° to 70°. For the same Sm 2Fe 17− x Ti x , corresponding characteristic peaks of Sm 2Fe 17− x Ti x N also shift to lower angles with the increasing of nitriding time. Furthermore, Δ2 θ for high angles was more negative than that for lower angles. Δ2 θ of samples with high Ti content was more negative than that with low Ti content when nitrogenized for less than 6 h, but Δ2 θ of corresponding peaks for all Sm 2Fe 17− x Ti x N samples behaved in the same way when nitrogenated for over 6 h. The maximum Δ2 θ deviation value at 2 θ=70° was over 2.2° after being nitrogenated for 10 h. The maximum lattice parameters, a=8.82 Å 2, c=12.88 Å, V=868 Å 3, and Δ V/ V=10.19% were obtained, but c/ a=1.45 was not changed. The saturation magnetization value of all Sm 2Fe 17− x Ti x N were limited in the scope of 88–1100 kA/m, so the saturation magnetization was not obviously improved for the Ti substitution for some Fe atoms in this alloy.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0921-4526 1873-2135
DOI:	10.1016/j.physb.2004.05.024