缪小吉,孙 斐,胡 静.Mn含量对Mn基Heusler合金磁及磁热性能影响[J].稀有金属材料与工程,2021,50(4):1405~1408.[Miao Xiaoji,Jing Hu.The effect of Mn concentration on the magnetic and magnetocaloric properties for Mn-based Heusler alloys[J].Rare Metal Materials and Engineering,2021,50(4):1405~1408.]
Mn含量对Mn基Heusler合金磁及磁热性能影响
投稿时间:2020-05-31  修订日期:2020-09-22
中文关键词:  Heusler合金  磁热效应  磁制冷  磁性能  磁热性能  晶体结构
基金项目:国家自然科学(21978025);江苏省第三期优势学科建设项目(PAPD);江苏高校品牌专业建设工程资助项目(TAPP)。
中文摘要:
      选用Mn基Heusler合金为研究对象。通过电弧熔炼和热处理制备样品,并用甩带法制成薄带形状。采用X射线衍射仪和振动样品磁强计等分析仪器测试了样品的晶体结构、磁及磁热性能,分析了Mn含量对材料晶体结构、磁和磁热性能的影响。研究发现,Mn2-xSn0.5Ga0.5合金在常温下为六方结构,在室温附近仅发生一次二阶磁性转变,无明显磁滞和热滞。居里温度和饱和磁化强度对Mn含量非常敏感,随着Mn含量升高,居里温度和饱和磁化强度均出现下降,由Mn1.2Sn0.5Ga0.5的304 K和64.1 emu/g分别降至Mn2Sn0.5Ga0.5的262 K和46.7 emu/g,这表明合金中的磁矩呈亚铁磁形态分布。由于没有磁滞和热滞,室温附近较大的工作温度区间,因此,该材料在磁制冷领域具有很好的应用前景。
The effect of Mn concentration on the magnetic and magnetocaloric properties for Mn-based Heusler alloys
英文关键词:Heusler alloys  magnetocaloric effect  magnetic refrigeration  magnetic properties  magnetocaloric properties  crystal structures
英文摘要:
      Mn-based Heusler alloys were selected as testing materials in this research, and the samples were prepared by arc-melting, subsequent heat treatment, and made in ribbon form by melt-spinning. The effects of Mn concentration on the crystal structures, magnetic and magnetocaloric properties were studied. It was found that Mn2-xSn0.5Ga0.5 crystalized in hexagonal structure at the room temperature. All samples undergo only second order phase transition at their Curie temperature near room temperature with nearly zero hysteresis. The Curie temperature and the saturation magnetization of the Mn2-xSn0.5Ga0.5 are very sensitive to Mn concentration where both Curie temperature and saturation magnetization decrease with the increase of Mn concentration, from 304 K and 64.1 emu/g to 262 K and 46.7 emu/g for Mn1.2Sn0.5Ga0.5 and Mn2Sn0.5Ga0.5, respectively, which indicates the ferrimagnetic order in these materials. Mn-based Heusler alloys will have a large application prospect in the field of magnetic refrigeration because of the absence of hysteresis and thermal hysteresis and with wide operating temperature range near room temperature.
作者单位E-mail
缪小吉 常州大学材料科学与工程国家级实验教学示范中心 14564147@qq.com 
孙 斐   
胡 静 常州大学材料科学与工程国家级实验教学示范中心  
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