Abstract The objective of this study is to investigate the magnetocaloric effect in Fe68+xCr12−xSi8B12 (x = 0, 4 and 10) ribbons prepared by melt spinning technique. X-ray diffraction and Mossbauer spectrometry show that the ribbons are amorphous and the average hyperfine field is very affected by chromium concentration. The temperature dependence of the magnetic entropy variation was calculated from the magnetization data. It was found that the Curie temperature of the sample increases with decreasing Cr content. The Maximum of magnetic entropy change ( - Δ S m max ) of μ0H = 2 T is about 1.06, 1.37 and 2.26 J.kg−1. K−1 for x = 0, 4 and 10, respectively. Arrott plots are investigated to conclude the nature of the magnetic transition, which are second-order ferromagnetic to paramagnetic phase transition near the Curie temperature. Theoretical investigation of the magnetization and the magnetocaloric effect are reported of which the maximum value of magnetocaloric change ( - Δ S m max ) and the relative cooling power (RCP) parameters are determined.

中文翻译：

---

Fe68+Cr12-Si8B12薄带的磁性和磁热特性

摘要 本研究的目的是研究通过熔体纺丝技术制备的 Fe68+xCr12−xSi8B12 (x = 0, 4 和 10) 带材的磁热效应。X 射线衍射和 Mossbauer 光谱法表明带是无定形的，平均超精细场受铬浓度的影响很大。从磁化数据计算磁熵变化的温度依赖性。发现样品的居里温度随着Cr含量的降低而升高。μ0H = 2 T 的磁熵变最大值 (- Δ S m max ) 约为 1.06、1.37 和 2.26 J.kg-1。对于 x = 0、4 和 10，分别为 K−1。研究阿罗特图以得出磁转变的性质，即居里温度附近的二阶铁磁到顺磁相变。