Synthesis, structure and magnetic properties of copper hydroxysulfates

Crystal Engineering Pub Date : 2002-09-01 DOI:10.1016/S1463-0184(02)00027-8

S. Vilminot , M. Richard-Plouet , G. André , D. Swierczynski , F. Bourée-Vigneron , E. Marino , M. Guillot

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引用次数: 19

Abstract

Cu₃(OH)₄SO₄ and Cu₄(OH)₆SO₄, synthetic equivalent of antlerite and brochantite minerals, have been obtained by hydrothermal synthesis from copper sulfate, soda and H₂O or D₂O. Their structures have been refined from single crystal X-ray and/or powder neutron diffraction data. They consists of edge-shared copper octahedron infinite chains connected to each other to define either triple chains in the case of antlerite or corrugated planes in the case of brochantite. Sulfate groups connect the former copper entities. From magnetic susceptibility measurements, both samples reveal a transition towards a 3D antiferromagnetic long range order at low temperature. In the paramagnetic domain, AF interactions are predominant for brochantite whereas ferromagnetic ones are evidenced for antlerite. The magnetic structures have been determined from powder neutron diffraction data and reveal the presence of ferromagnetic chains AF coupled. The magnetic results have been related to the Cu-O-Cu bridge angle values.

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羟基硫酸铜的合成、结构和磁性能

以硫酸铜、纯碱和H2O或D2O为原料，采用水热法合成了角闪石和针闪石矿物的合成物Cu3(OH)4SO4和Cu4(OH)6SO4。它们的结构已经从单晶x射线和/或粉末中子衍射数据中得到了改进。它们由边缘共享的铜八面体无限链组成，相互连接，在鹿角石的情况下定义三重链或在brochantite的情况下定义波纹平面。硫酸盐基团连接前铜实体。从磁化率测量来看，两种样品在低温下都向三维反铁磁长程序转变。在顺磁畴中，角闪石的相互作用占优势，而角闪石则表现为铁磁相互作用。从粉末中子衍射数据中确定了其磁性结构，并揭示了AF耦合铁磁链的存在。磁性结果与Cu-O-Cu电桥角值有关。

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Crystal Engineering

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