Abstract The LaFe11.2Si1.8/Ta composite materials with Ta contents of 4, 8 and 12 wt% were fabricated. The crystal structure, component, magnetocaloric property and thermal conductivity of the composite materials were detected. It is found that the addition of Ta does not change the Curie temperature and magnetic phase transition feature of LaFe11.2Si1.8/Ta composite materials. The maximal magnetic entropy change (−ΔSMmax) are 11.17, 10.71 and 10.56 J/kg·K for Ta contents of 4, 8 and 12 wt% under a magnetic field change of 0–7 T, respectively. Correspondingly, the values of relative cooling power (RCP) are 394.55, 402.91 and 408.20 J/kg. The thermal conductivity (λ) improves remarkably with increasing Ta content, and the values of λ are evaluated to be 4.49(6), 5.56(3) and 7.10(2) W/m·K for LaFe11.2Si1.8/Ta with Ta contents of 4, 8 and 12 wt% at their own Curie temperatures, respectively.

中文翻译：

---

LaFe11.2Si1.8/Ta磁热复合材料的显微结构、磁性能和热导率

摘要 制备了Ta含量为4、8和12wt%的LaFe11.2Si1.8/Ta复合材料。检测了复合材料的晶体结构、成分、磁热性能和热导率。发现Ta的加入不会改变LaFe11.2Si1.8/Ta复合材料的居里温度和磁相变特征。在 0-7 T 的磁场变化下，Ta 含量为 4、8 和 12 wt% 时，最大磁熵变 (-ΔSMmax) 分别为 11.17、10.71 和 10.56 J/kg·K。相应地，相对冷却功率 (RCP) 值为 394.55、402.91 和 408.20 J/kg。随着Ta含量的增加，热导率（λ）显着提高，LaFe11.2Si1.8/Ta的λ值分别为4.49（6）、5.56（3）和7.10（2）W/m·K 4、Ta含量