Structure and magnetism of a new hexagonal polymorph of Ba3Tb(BO3)3 with a quasi-2D triangular lattice
Structure and magnetism of a new hexagonal polymorph of Ba3Tb(BO3)3 with a quasi-2D triangular lattice
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DOI：
10.1016/j.jssc.2020.121640
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发表时间：
2020-12-01
影响因子：
3.3
通讯作者：
Dutton, Sian E.
中科院分区：
文献类型：
--
作者：
Kelly, Nicola D.;Liu, Cheng;Dutton, Sian E.
本文报道了一种新的六方相（P63 cm）低温相Ba_3 Tb（BO_3）（3）的结构和磁性，它与重稀土硼酸盐Ba（3）Ln（BO_3）（3）（Ln = Dy-Lu）同构。晶体结构包含准二维（2D）的Tb 3+离子的三角形晶格，并预测显示不寻常的磁性行为作为低维的结果。磁化率chi（T）显示反铁磁相互作用（θ（CW）=-7.15K），在T >= 2K时没有明显的有序转变，但对chi '（T）、等温磁化强度和热容的分析表明，T接近10 K时可能存在短程有序。该材料在T <4K时表现出逆磁热效应。
This article reports the structural and magnetic characterisation of a new hexagonal (P63cm) low-temperature phase of Ba3Tb(BO3)(3), isostructural with the heavier lanthanide borates with formula Ba(3)Ln(BO3)(3) (Ln = Dy-Lu). The crystal structure contains a quasi-two-dimensional (2D) triangular lattice of Tb3+ ions and is predicted to display unusual magnetic behaviour as a result of the low dimensionality. Magnetic susceptibility chi(T) shows antiferromagnetic interactions (theta(CW) = -7.15 K) and no sharp ordering transition at T >= 2 K, but analysis of chi'(T), isothermal magnetisation and heat capacity suggests the possibility of short-range ordering a T approximate to 10 K. The material exhibits an inverse magnetocaloric effect at T < 4 K.