Magnetocaloric effect in ferromagnetic 1/1 quasicrystal approximants Au64Al22R14 (R = Gd, Tb, and Dy)
Magnetocaloric effect in ferromagnetic 1/1 quasicrystal approximants Au64Al22R14 (R = Gd, Tb, and Dy)
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DOI：
10.1016/j.jallcom.2021.160669
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发表时间：
2021
影响因子：
6.2
通讯作者：
N. Kikugawa;T. Hiroto;A. Ishikawa;Shintaro Suzuki;H. Sakurai;R. Tamura
中科院分区：
文献类型：
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作者：
N. Kikugawa;T. Hiroto;A. Ishikawa;Shintaro Suzuki;H. Sakurai;R. Tamura
报道了空间群为Im 3̅的Tsai型准1/1准晶Au Al2 2 R14(R=Gd，Tb，Dy)的磁热效应。由磁化率和比热测量证实，当R=Gd、Tb和Dy时，当居里温度分别为27、15和9.5K时，电子数比(e/a)为1.72的化合物在体相发生铁磁相变。当R=Gd、Tb和Dy时，材料的磁熵变(ΔS M)分别为6.3、4.4和4.8J/Kmol-R。计算了与磁热效应、绝热温变(ΔTad)和相对制冷功率(Rcp)有关的其他参数。我们还讨论了与最近报道的在二十面体团簇上形成的独特磁序有关的近似物的磁热效应。二十面体团簇是Tsai型1/1准晶近似物的构建单元。
We report the magnetocaloric effect of the Tsai-type 1/1 quasicrystal approximants Au 64 Al 22 R 14 (R= Gd, Tb, and Dy) with the space group of Im 3 ̅. These approximants with the electron-per-atom (e/a) ratio of 1.72 exhibit a ferromagnetic transition in bulk at the Curie temperatures of 27, 15, and 9.5 K for R= Gd, Tb, and Dy, respectively, as confirmed by both magnetic susceptibility and specific heat measurements. The magnetic entropy change (Δ S M) of the materials for a field change of 7 T are 6.3, 4.4, and 4.8 J/K mol-R for R= Gd, Tb, and Dy, respectively. Other parameters related to the magnetocaloric effect, the adiabatic temperature change (ΔT ad) and the relative cooling power (RCP) are also evaluated. We also discuss the obtained magnetocaloric effect of the approximants with relation to the recently reported unique magnetic order formed on the icosahedral clusters, a building unit of the Tsai-type 1/1 quasicrystal approximants.