Identification of slow magnetic relaxation and magnetocoolant capabilities of heterobimetallic lanthanide-manganese metallacrown-like compounds
Identification of slow magnetic relaxation and magnetocoolant capabilities of heterobimetallic lanthanide-manganese metallacrown-like compounds
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DOI：
10.1016/j.poly.2021.115190
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发表时间：
2021-04-15
期刊：
影响因子：
2.6
通讯作者：
Pecoraro, Vincent L.
中科院分区：
文献类型：
--
作者：
Lutter, Jacob C.;Boron, Thaddeus T., III;Pecoraro, Vincent L.
提出了两种类型的3d-4f化合物，[Dy-4(III) Mn-4(III) (OH)(2)(O2C2H3)(3)(shi)(4)(H(2)shi)(4)(Hsal)(3)(DMF)(4)](-)3DMF （Dy-1）和[Ln(6)(III) Mn-2(III) Mn-2(IV) (shi)(6)(Hshi)(4)(H(2)shi)(2)(Hsal)(4)(DMF)(8)]中心点4H(2)O (Ln-2) (Ln = Dy或Gd， H（3)shi =水杨酸，H(2)sal =水杨酸）。虽然Dy-1和Dy-2都没有表现出明显的磁化弛豫障碍，但在这两种情况下都观察到失相交流磁化率。Gd-2表现出作为磁冷剂的潜力，其重熵变化最大可达18.89 J.kg（-1）。K-1在3k和δ H = 7 t时，该值约为理论最大值的53%。(C) 2021 Elsevier Ltd版权所有。
Two types of 3d-4f compounds are presented, [Dy-4(III) Mn-4(III) (OH)(2)(O2C2H3)(3)(shi)(4)(H(2)shi)(4)(Hsal)(3)(DMF)(4)](-)3DMF (Dy-1) and [Ln(6)(III) Mn-2(III) Mn-2(IV) (shi)(6)(Hshi)(4)(H(2)shi)(2)(Hsal)(4)(DMF)(8)]center dot 4H(2)O (Ln-2) (Ln = Dy or Gd, H(3)shi = salicylhydroxamic acid, H(2)sal = salicylic acid). While neither Dy-1 and Dy-2 demonstrated a significant barrier to magnetization relaxation, out-of-phase ac magnetic susceptibility was observed in both cases. Gd-2 showed potential as a magnetocoolent with gravimetric entropy changes reaching a maximum of 18.89 J.kg(-1).K-1 at 3 K and Delta H = 7 T. This value represents approximately 53% of the theoretical maximum. (C) 2021 Elsevier Ltd. All rights reserved.