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FeNbB粉末的临界行为、磁热效应及超精细结构研究

Investigation of the Critical Behavior, Magnetocaloric Effect and Hyperfine Structure in the FeNbB Powders.

作者信息

Alleg Safia, Chabi Thaounza, Bensebaa Nadia, Saurina Joan, Escoda Lluisa, Hlil El-Kebir, Suñol Joan-Josep

机构信息

Laboratoire de Magnétisme et Spectroscopie des solides (LM2S), Département de Physique, Université Badji Mokhtar Annaba, BP12, Annaba 23000, Algeria.

Departamento Física, Universitat de Girona, Campus Montilivi s/n, 17003 Girona, Spain.

出版信息

Materials (Basel). 2020 Oct 9;13(20):4476. doi: 10.3390/ma13204476.

DOI:10.3390/ma13204476
PMID:33050307
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7601455/
Abstract

Microstructure as well as magnetic, thermal and magnetocaloric properties of the mechanically alloyed FeNbB powders have been investigated by means of Mössbauer spectrometry, differential scanning calorimetry (DSC), and magnetic measurements. The Mössbauer spectrometry results showed the formation of nanostructured Fe(B) and Fe(Nb) solid solutions, FeB boride, and an amorphous phase. The endothermic and exothermic peaks that are observed in the DSC curves might be related to the Curie temperature, and the crystallization of the amorphous phase, respectively. The critical exponent values around the magnetic phase transition of the amorphous phase ( 480 K), are deduced from the modified Arrott plots, Kouvel-Fisher curves and critical isotherm examination. The calculated values (β = 0.457 ± 0.012, γ = 0.863 ± 0.136 and δ = 3.090 ± 0.004) are near to those of the mean field model, revealing a dominating role of magnetic order arising due to long-range ferromagnetic interactions, as the critical exponents are mean-field-like. The maximum entropy change and the refrigerant capacity values are 1.45 J/kg·K and 239 J/kg, respectively, under a magnetic field of 5 T.

摘要

通过穆斯堡尔谱、差示扫描量热法（DSC）和磁性测量等手段，对机械合金化的FeNbB粉末的微观结构以及磁、热和磁热性能进行了研究。穆斯堡尔谱结果表明形成了纳米结构的Fe(B)和Fe(Nb)固溶体、FeB硼化物以及非晶相。在DSC曲线中观察到的吸热峰和放热峰可能分别与居里温度和非晶相的结晶有关。通过修正的阿罗特图、库维尔-费舍尔曲线和临界等温线检验，推导出非晶相（480 K）磁相变周围的临界指数值。计算值（β = 0.457 ± 0.012，γ = 0.863 ± 0.136和δ = 3.090 ± 0.004）接近平均场模型的值，表明由于长程铁磁相互作用产生的磁有序起主导作用，因为临界指数类似平均场。在5 T的磁场下，最大熵变和制冷量值分别为1.45 J/kg·K和239 J/kg。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f816/7601455/8dedf0156eae/materials-13-04476-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f816/7601455/301eb999d2a4/materials-13-04476-g008.jpg
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