Structure, magnetic and cryogenic magneto-caloric properties in intermetallic gallium compounds RE2Co2Ga (RE = Dy, Ho, Er, and Tm)
Structure, magnetic and cryogenic magneto-caloric properties in intermetallic gallium compounds RE2Co2Ga (RE = Dy, Ho, Er, and Tm)
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DOI：
10.1063/1.5044578
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发表时间：
2018-07
影响因子：
3.2
通讯作者：
Yikun Zhang;D. Guo;S. Geng;Xionggang Lu;G. Wilde
中科院分区：
文献类型：
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作者：
Yikun Zhang;D. Guo;S. Geng;Xionggang Lu;G. Wilde
合成了含不同稀土元素（RE = Dy, Ho, Er, Tm）的金属间镓化合物RE2Co2Ga，并对其晶体结构、微观结构、磁性和低温磁热性能进行了研究。RE2Co2Ga化合物结晶为有序正交w2b2co型结构（空间群Immm）。所有的RE2Co2Ga化合物都经历了从顺磁到调频的二阶铁磁有序转变，从而引起可逆的磁热效应。RE2Co2Ga化合物中RE = Dy、Ho、Er和Tm的居里温度分别为55.0、38.5、25.5和11.6 K，满足de Gennes标度。RE2Co2Ga化合物在其自身的相变温度附近表现出较小的MCE（即- ΔSM，等温磁熵变化），在RE = Dy, Ho， Er和Tm的7 T场变化（ΔH）中，- ΔSM的最大值分别为7.5,14.6,11.2和13.2 J/kg K。相应的相对冷却功率分别为212j /kg、335j /kg、304 J/kg、239 J/kg。合成了含不同稀土元素（RE = Dy, Ho, Er, Tm）的金属间镓化合物RE2Co2Ga，并对其晶体结构、微观结构、磁性和低温磁热性能进行了研究。RE2Co2Ga化合物结晶为有序正交w2b2co型结构（空间群Immm）。所有的RE2Co2Ga化合物都经历了从顺磁到调频的二阶铁磁有序转变，从而引起可逆的磁热效应。RE2Co2Ga化合物中RE = Dy、Ho、Er和Tm的居里温度分别为55.0、38.5、25.5和11.6 K，满足de Gennes标度。RE2Co2Ga化合物在其自身的相变温度附近表现出较小的MCE（即- ΔSM，等温磁熵变化），在RE = Dy, Ho， Er和Tm的7 T场变化（ΔH）中，- ΔSM的最大值分别为7.5,14.6,11.2和13.2 J/kg K。因此，相对c…
The intermetallic gallium compounds RE2Co2Ga with different rare earths (RE = Dy, Ho, Er, and Tm) were synthesized, and their crystal structure, microstructure, magnetic, and cryogenic magneto-caloric performances were investigated. The RE2Co2Ga compounds crystallize with an ordered orthorhombic W2B2Co-type structure (space group Immm). All the RE2Co2Ga compounds undergo ferromagnetic (FM) ordering (second-order) from a paramagnetic to FM transition which induces reversible magneto-caloric effects (MCE). The Curie temperatures (TC) in RE2Co2Ga compounds are determined to be 55.0, 38.5, 25.5, and 11.6 K for RE = Dy, Ho, Er, and Tm, respectively, which fulfill the de Gennes scaling. The RE2Co2Ga compounds show relatively small MCE (i.e., −ΔSM, isothermal magnetic entropy change) around their own phase transition temperatures, and the maximal values of −ΔSM are 7.5, 14.6, 11.2, and 13.2 J/kg K in the field change (ΔH) of 7 T for RE = Dy, Ho, Er, and Tm, respectively. Accordingly, the values of the relative cooling power are 212, 335, 304, and 239 J/kg, respectively.The intermetallic gallium compounds RE2Co2Ga with different rare earths (RE = Dy, Ho, Er, and Tm) were synthesized, and their crystal structure, microstructure, magnetic, and cryogenic magneto-caloric performances were investigated. The RE2Co2Ga compounds crystallize with an ordered orthorhombic W2B2Co-type structure (space group Immm). All the RE2Co2Ga compounds undergo ferromagnetic (FM) ordering (second-order) from a paramagnetic to FM transition which induces reversible magneto-caloric effects (MCE). The Curie temperatures (TC) in RE2Co2Ga compounds are determined to be 55.0, 38.5, 25.5, and 11.6 K for RE = Dy, Ho, Er, and Tm, respectively, which fulfill the de Gennes scaling. The RE2Co2Ga compounds show relatively small MCE (i.e., −ΔSM, isothermal magnetic entropy change) around their own phase transition temperatures, and the maximal values of −ΔSM are 7.5, 14.6, 11.2, and 13.2 J/kg K in the field change (ΔH) of 7 T for RE = Dy, Ho, Er, and Tm, respectively. Accordingly, the values of the relative c...