Structure, magnetism and magnetocaloric effect in a new triangular lattice compound Gd(3)Cu(9)(OH)(19)Br(8).
Structure, magnetism and magnetocaloric effect in a new triangular lattice compound Gd(3)Cu(9)(OH)(19)Br(8).
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新型三角晶格化合物Gd3Cu9(OH)19Br8的结构、磁性和磁热效应
作者：
采用水热法合成了一种新的三角晶格化合物Gd 3Cu 9（OH）19 Br 8。用X射线衍射、磁化率、等温磁化强度和比热等方法研究了Gd_3Cu_9（OH）_（19）Br_8的结构、磁性和磁热效应。在Gd 3Cu 9（OH）19 Br 8中，Cu 2+离子沿ab平面沿着形成可果美晶格，并且Gd 3+离子位于可果美层的六方孔的中心。Cu亚晶格和Gd亚晶格重叠并构成磁性三角晶格。磁化率和比热曲线的温度依赖性表明没有磁性转变到2 K，这表明在低温下的顺磁性的行为。根据麦克斯韦方程计算了低温磁热效应。当磁场变化为0-7 T时，最大磁熵变-ΔSM为26.04J kg-1 K-1，绝热温变ΔTad为13.79K，表明该化合物在低温磁制冷领域具有潜在的应用价值。讨论了4f-3d相互作用对磁性和MCE的影响。Gd 3Cu 9（OH）19 Br 8的二维磁晶格，其中Gd 3+离子位于Cu-Kagome晶格的六角孔中心。
A new triangular lattice compound Gd3Cu9(OH)19Br8 has been synthesized by the hydrothermal method. The structure, magnetism and magnetocaloric effect of Gd3Cu9(OH)19Br8 have been studied by X-ray diffraction, magnetic susceptibility, isothermal magnetization and specific heat measurements. In Gd3Cu9(OH)19Br8, the Cu2+ ions form a Kagome lattice along the ab plane, and Gd3+ ions are located in the center of hexagonal holes of the Kagome layer. The Cu-sublattice and Gd-sublattice overlap and constitute a magnetic triangular lattice. The temperature dependence of susceptibility and specific heat curves indicate no magnetic transition down to 2 K, suggesting a paramagnetic-like behavior at low temperature. The magnetocaloric effect (MCE) at low temperature has been calculated according to Maxwell's equations. The maximum value of magnetic entropy change −ΔSM is 26.04 J kg−1 K−1 and adiabatic temperature change ΔTad is 13.79 K, for a field change of 0–7 T, indicating a potential application of this compound in the field of magnetic refrigeration at low temperature. The influence of 4f–3d interaction on magnetism and MCE is also discussed. The two-dimensional magnetic lattice of Gd3Cu9(OH)19Br8, where Gd3+ ions are located in the center of hexagonal holes of the Cu-Kagome lattice.
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