Syntheses, Structures, and Magnetic Properties of New Antiferromagnets Ba2M3(C2O4)3(OH)4·3H2O (M = Ni, Co) with a Frustrated Spin Hexamer
Syntheses, Structures, and Magnetic Properties of New Antiferromagnets Ba2M3(C2O4)3(OH)4·3H2O (M = Ni, Co) with a Frustrated Spin Hexamer
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DOI：
10.1021/acs.cgd.2c00105
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Wenjing Zhang;X. Yue;Donger Cheng;Yi-Yan Wang;Yan-Yi Sun;Hui Liang;Daijian Wu;Qiuju Li;Junfeng Wang;Z. Ouyang;Xuefeng Sun
中科院分区：
文献类型：
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作者：
Wenjing Zhang;X. Yue;Donger Cheng;Yi-Yan Wang;Yan-Yi Sun;Hui Liang;Daijian Wu;Qiuju Li;Junfeng Wang;Z. Ouyang;Xuefeng Sun
采用传统的水热法合成了两种新的同结构反铁磁体Ba2M3（C2O4）3（OH）4·3H2O（M = Ni，Co）。该系统的基本磁性单元是由两个非共面三角环构成的自旋六聚体。磁性自旋六聚体通过草酸根基团相互连接，形成沿着a平面的二维骨架。测量了磁化率、磁化强度和比热来研究该系统的磁性。Ba2Ni3（C2O4）3（OH）4·3H2O（Ni化合物）在T1 = 20 K和T2 = 12 K处有两个磁转变，其韦斯温度θW= −135.65 K。而Ba2Co3（C2O4）3（OH）4·3H2O（Co化合物）在T1 = 10 K时发生一次磁转变，其韦斯温度θW= −85.03 K。发现这两种化合物都是受抑反铁磁体，其中Ni化合物的受抑因子off= 6.8，Co化合物的受抑因子f = 8.5。讨论了自旋阻挫的可能来源。
Two new isostructural antiferromagnets Ba2M3(C2O4)3(OH)4·3H2O (M = Ni, Co) are synthesized by the traditional hydrothermal method. The basic magnetic unit of this system is a spin hexamer constituted by two non-coplanar triangular rings. The magnetic spin hexamers were connected with each other by oxalate groups, forming a two-dimensional framework along theabplane. Susceptibility, magnetization, and specific heat have been measured to study the magnetism of this system. Ba2Ni3(C2O4)3(OH)4·3H2O (Ni compound) exhibits two magnetic transitions atT1= 20 K andT2= 12 K with Weiss temperature θW= −135.65 K. However, Ba2Co3(C2O4)3(OH)4·3H2O (Co compound) undergoes one magnetic transition atT1= 10 K with Weiss temperature θW= −85.03 K. It is found that both compounds are frustrated antiferromagnets with the frustrated factor off= 6.8 for the Ni compound andf= 8.5 for the Co compound. The possible origin of spin frustration is discussed.