Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States.
Department of Chemistry , Louisiana State University , Baton Rouge , Louisiana 70803 , United States.
Inorg Chem. 2019 Mar 4;58(5):3308-3315. doi: 10.1021/acs.inorgchem.8b03372. Epub 2019 Feb 14.
A previously unreported family of electrically insulating rare-earth borates, RbBa R(BO) ( R = Y, Gd-Yb), was designed and then successfully obtained by traditional solid-state reaction. They crystallize in a monoclinic crystal system space group P2 /m (No. 11). They feature triangular planar rare-earth ( R) lattices, which are part of, for example, [Yb(BO)] infinite 2D layers. These R-based triangular lattices are stacked with layers of crystallographically ordered Rb and Ba atoms to build the 3D structures. Polycrystalline samples of RbBa R(BO) were used to study the elementary magnetic properties, and millimeter-size RbBaYb(BO) single crystals were grown by spontaneous nucleation for further anisotropic magnetic characterization. Antiferromagnetic spin interactions are observed for all magnetic compounds, and no long-range magnetic ordering is found down to 1.8 K. Our results suggest that this RbBa R(BO) ( R = Gd-Yb) family may be of further interest both experimentally and theoretically as highly geometrically frustrated magnets.
一个以前未报道的电绝缘稀土硼酸盐家族，RbBaR(BO)（R=Y，Gd-Yb），通过传统的固态反应设计并成功获得。它们在单斜晶系空间群 P2/m（No.11）中结晶。它们的特征是三角形平面稀土（R）晶格，这些晶格是[Yb(BO)]无限二维层的一部分。这些基于 R 的三角形晶格与结晶有序的 Rb 和 Ba 原子层堆叠，构建 3D 结构。使用 RbBaR(BO)的多晶样品研究了基本磁性质，并通过自发成核生长了毫米尺寸的 RbBaYb(BO)单晶，以进行各向异性磁特性表征。所有磁性化合物都观察到反铁磁自旋相互作用，在 1.8 K 以下没有发现长程磁有序。我们的结果表明，作为高度几何阻挫的磁体，这个 RbBaR(BO)（R=Gd-Yb）家族在实验和理论上可能都具有进一步的研究兴趣。
