Spin configuration, magnetic and magnetostrictive properties of Tb0.27Dy0.73-xNdxFe2 compounds
Spin configuration, magnetic and magnetostrictive properties of Tb0.27Dy0.73-xNdxFe2 compounds
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Tb0.27Dy0.73-xNdxFe2 化合物的自旋构型、磁性和磁致伸缩性能
DOI：
10.1016/j.matchemphys.2020.122951
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发表时间：
2020-07-15
影响因子：
4.6
通讯作者：
Song, Xiaoping
中科院分区：
文献类型：
--
作者：
Murtaza, Adil;Li, Yebei;Song, Xiaoping
采用平衡条件和相应的高压退火方法制备了多晶Tb0.27Dy0.73-xNdxFe2 Laves相化合物。研究了它们的结构、自旋构型、磁性和磁致伸缩性能。x射线衍射（XRD）的Rietveld细化分析表明，所研究的化合物以mgcu2型立方Laves相为主，同时存在少量hcp型富稀土相和puni3型REFe3相。随着Nd浓度的增加，磁化强度（M-s）和居里温度（T-c）降低，晶格参数增大。在室温（RT）下，沿[111]轴观察到易磁化（EMD）方向伴菱形畸变（lambda(111)）。自旋取向转变（SRT）发生在低温下，这可以用双亚晶格模型来解释。根据实验结果，设计了Tb0.27Dy0.73-xNdxFe2 Laves相的详细相图，以展示不同的自旋构型和晶体结构。在x = 0.1时实现了Nd和Dy亚晶格之间的各向异性补偿。含nd的Tb0.27Dy0.73-xNdxFe2 Laves相化合物表现出较大的低场多晶磁致伸缩（λ (s)）和较大的自发磁致伸缩系数(λ(111)，近似于1.7 × 10(-3))，这可能使其成为一种良好的磁致伸缩材料。结果表明，在Tb0.27Dy0.73-xNdxFe2化合物中以Dy取代Nd有利于提高其磁致伸缩性能。本研究对设计具有技术应用价值的钕基磁致伸缩材料具有一定的指导意义。
The polycrystalline Tb0.27Dy0.73-xNdxFe2 Laves phase compounds were prepared at equilibrium conditions and consequent annealing method at high pressure. Their structural, spin configuration, magnetic and magnetostrictive properties were studied. Rietveld refinement analysis of X-ray diffraction (XRD) reveals that the studied compounds possess predominantly the MgCu2-type cubic Laves phase, coexisting with a small amount of hcp-type rare-earth (RE)-rich phase and PuNi3-type REFe3 phase. The magnetization (M-s) and Curie temperature (T-c) decrease while the lattice parameter increases with the increase in Nd concentration. The direction of easy magnetization (EMD) accompanied by a rhombohedral distortion (lambda(111)) was observed along [111] axis at room temperature (RT). The spin reorientation transition (SRT) occurs at low temperature, which was explained by the two-sublattice model. Based on the experimental results, a detailed phase diagram has been designed for the Tb0.27Dy0.73-xNdxFe2 Laves phase to demonstrate the different spin configurations and crystal structure. The anisotropy compensation between the Nd and Dy sublattices was realized at x = 0.1. The Nd-containing Tb0.27Dy0.73-xNdxFe2 Laves phase compound shows large low-field polycrystalline magnetostriction (lambda(s)) and large spontaneous magnetostriction coefficient (lambda(111)similar to 1.7 x 10(-3) ), which may make it a good magnetostrictive material. Our results indicate that the substitution of Nd by Dy in Tb0.27Dy0.73-xNdxFe2 compounds is beneficial for the improvement of magnetostrictive properties. The present study might be useful to design Nd-based magnetostrictive materials for technological applications.