The effect of Ga substitution on the magnetic properties of Nd2Fe14B, Pr2Fe14B, and PrCo5
The effect of Ga substitution on the magnetic properties of Nd2Fe14B, Pr2Fe14B, and PrCo5
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DOI：
10.1063/1.340643
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发表时间：
1988-04
影响因子：
3.2
通讯作者：
A. Pędziwiatr;S. Sankar;W. Wallace
中科院分区：
文献类型：
--
作者：
A. Pędziwiatr;S. Sankar;W. Wallace
合成了R2 Fe 14 −xGaxB（R=Pr和Nd）和PrCo 5 −xGax合金，并在室温下通过粉末X射线衍射和在4.2-1100 K温度范围内通过磁力计进行了检测。确定了晶格参数、居里温度、自旋重取向温度、各向异性场和饱和磁化强度。相分析表明，在2：14：1合金中，仅当x≤1时存在单相材料，在1：5合金中，仅当x≤2时存在单相材料。在所有情况下，观察到Ga取代后的晶格参数的增加。对于2：14：1合金，观察到居里温度增加约20 K，而在1：5合金中，居里温度显著降低。饱和磁化强度值降低Ga取代。在Nd 2Fe 14 −xGaxB系统中，Ga的加入略微增强了各向异性场。在Nd 2Fe 14 −xGaxB和PrCo 5 −xGax中的自旋重取向现象受到Ga添加的强烈影响。所观察到的行为进行了讨论，在优先取代Ga原子到Nd 2Fe 14 B-型晶体。
R2Fe14−xGaxB (R=Pr and Nd) and PrCo5−xGax alloys were synthesized and examined by powder x‐ray diffraction at room temperature and by magnetometry in the temperature range 4.2–1100 K. Lattice parameters, Curie temperature, spin‐reorientation temperatures, anisotropy fields, and saturation magnetizations were determined. Phase analysis revealed that single‐phase materials exist only for x≤1 in the case of 2:14:1 alloys and for x≤2 for 1:5 alloys. An increase in lattice parameters is observed upon Ga substitution in all cases. About 20 K increase in the Curie temperature is observed for 2:14:1 alloys, whereas there is a dramatic decrease in 1:5 alloys. Saturation magnetization values decrease upon Ga substitution. The anisotropy field is slightly enhanced by Ga addition in the Nd2Fe14−xGaxB system. Spin‐reorientation phenomena in Nd2Fe14−xGaxB and PrCo5−xGax are strongly affected by Ga addition. The observed behavior is discussed in terms of preferential substitution of Ga atoms into the Nd2Fe14B‐type cryst...