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首页> 外文期刊>Physica, B. Condensed Matter >Study on the microstructure and magnetic properties of Sm-Fe-Ti alloys and their nitrides
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Study on the microstructure and magnetic properties of Sm-Fe-Ti alloys and their nitrides

机译：Sm-Fe-Ti合金及其氮化物的组织和磁性能的研究

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摘要

Sm2Fe17-xTixN compounds were prepared from the starting Sm2Fe17-xTix alloy by nitrogenation processes for 2, 4, 6 and 10 h. The microstructure and crystal lattice parameters of the Sm2Fe17-xTixN system were presented in detail. The main phase of all Sm2Fe17-xTixN (with x = 0, 0.5, 1.0 and 2.0) compounds behave the Th2Zn17-type structure, tiny alpha-Fe, SmFe2, FeTi, Fe2Ti phases may coexist. Ti dissolves into three different phases: Sm-2(Fe,Ti)(17), FexTi and alpha-Fe(Ti). With increasing Ti content, corresponding characteristic peaks of Sm2Fe17-xTix shift to lower angles and the increment (DeltaV/V) of unit cell volume for Sm2Fe15Ti2 were increased up to 3.898%. However, the deviation amplitude Delta2theta for the same sample was nearly not changed with the increasing of 2theta angle from 20degrees to 70degrees. For the same Sm2Fe17-xTix, corresponding characteristic peaks of Sm2Fe17-xTixN also shift to lower angles with the increasing of nitriding time. Furthermore, Delta2theta for high angles was more negative than that for lower angles. Delta2theta of samples with high Ti content was more negative than that with low Ti content when nitrogenized for less than 6 h, but Delta2theta of corresponding peaks for all Sm2Fe17-xTixN samples behaved in the same way when nitrogenated for over 6 h. The maximum Delta2theta deviation value at 2theta = 70degrees was over 2.2degrees after being nitrogenated for 10 h. The maximum lattice parameters, a = 8.82 Angstrom(2), c = 12.88Angstrom, V = 868Angstrom(3), and DeltaV/V = 10.19% were obtained, but c/a = 1.45 was not changed. The saturation magnetization value of all Sm2Fe17-xTixN 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. (C) 2004 Elsevier B.V. All rights reserved.
机译：Sm2Fe17-xTixN化合物是由起始Sm2Fe17-xTix合金经2、4、6和10 h的氮化过程制备的。详细介绍了Sm2Fe17-xTixN系统的微观结构和晶格参数。所有Sm2Fe17-xTixN（x = 0、0.5、1.0和2.0）化合物的主相都具有Th2Zn17型结构，微小的α-Fe，SmFe2，FeTi，Fe2Ti相可以共存。 Ti分为三个不同的相：Sm-2（Fe，Ti）（17），FexTi和α-Fe（Ti）。随着Ti含量的增加，Sm2Fe17-xTix的相应特征峰移至较低角度，Sm2Fe15Ti2的晶胞体积增量（DeltaV / V）增加至3.898％。但是，同一样品的偏差幅度Delta2θ几乎不会随着2θ角从20度增加到70度而变化。对于相同的Sm2Fe17-xTix，随着渗氮时间的增加，Sm2Fe17-xTixN的相应特征峰也会移至较小的角度。此外，大角度的Delta2theta比小角度的Delta2theta更负。当氮化时间少于6 h时，高Ti含量的样品的Delta2theta比低Ti含量的样品更负，但是当氮化6 h以上时，所有Sm2Fe17-xTixN样品的相应峰的Delta2theta表现相同。氮化10 h后，在2θ= 70度的最大Delta2θ偏差值超过2.2度。获得了最大晶格参数a = 8.82埃（2），c = 12.88埃，V = 868埃（3）和DeltaV / V = 10.19％，但c / a = 1.45不变。所有Sm2Fe17-xTixN的饱和磁化强度值都限制在88-1100 kA / m的范围内，因此用Ti替代该合金中的某些Fe原子时，饱和磁化强度没有明显提高。 （C）2004 Elsevier B.V.保留所有权利。

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