Abstract Light-rare-earth-based Pr ( Fe 1 - x Si x ) 1.93 alloys ( 0 ⩽ x ⩽ 0.1 ) with pure cubic Laves phase were synthesized by high-pressure annealing method. Si substitution effects on magnetic, electrical and magnetostrictive properties of light-rare-earth-based Pr ( Fe 1 - x Si x ) 1.93 alloys were systematically investigated. It was found that the lattice parameter a and Curie temperature T C of the cubic Laves phase in the alloys increase with the increasing Si content up to x = 0.05 , which might be ascribed to the preferential occupation of Si in the Laves phase interstitial sites. The magnetization at the maximum available field of 15 kOe, σ 15 k , decreases monotonically with the increasing x. A significant increase of 67% in electrical resistivity was observed in Pr ( Fe 0.9 Si 0.1 ) 1.93 alloy at room temperature. The magnetostriction at the field of 3 kOe of Pr ( Fe 0.95 Si 0.05 ) 1.93 is about 542 ppm, which is even larger than the saturation magnetostriction of heavy-rare-earth-based Tb 0.2 Dy 0.22 Ho 0.58 Fe 2 single crystal ( λ s = 530 ppm). The attractive price, lower eddy current loss, together with high magnetostrictive response suggest that the Pr ( Fe 0.95 Si 0.05 ) 1.93 alloy might be a good candidate material for the potential magnetostrictive applications.

中文翻译：

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高电阻率轻稀土基PrFe1.93磁致伸缩合金的设计：Si掺杂和高压退火

摘要 采用高压退火法合成了具有纯立方Laves相的轻稀土基Pr ( Fe 1 - x Si x ) 1.93 合金( 0 ⩽ x ⩽ 0.1 )。系统地研究了硅取代对轻稀土基Pr (Fe 1 - x Si x ) 1.93 合金的磁、电和磁致伸缩性能的影响。发现合金中立方 Laves 相的晶格参数 a 和居里温度 TC 随 Si 含量的增加而增加，直至 x = 0.05，这可能归因于 Si 在 Laves 相间隙位中的优先占据。在 15 kOe 的最大可用场 σ 15 k 下的磁化强度随着 x 的增加而单调减少。在室温下观察到 Pr (Fe 0.9 Si 0.1 ) 1.93 合金的电阻率显着增加了 67%。Pr ( Fe 0.95 Si 0.05 ) 1.93 3 kOe场下的磁致伸缩约为542 ppm，甚至大于重稀土基Tb 0.2 Dy 0.22 Ho 0.58 Fe 2 单晶(λ s = 530 ppm）。有吸引力的价格、较低的涡流损耗以及高磁致伸缩响应表明 Pr ( Fe 0.95 Si 0.05 ) 1.93 合金可能是潜在磁致伸缩应用的良好候选材料。