Orthoborates LiCdRE5(BO3)(6) (RE = Sm-Lu and Y) with Rare-Earth Ions on a Triangular Lattice: Synthesis, Crystal Structure, and Optical and Magnetic Properties
Orthoborates LiCdRE5(BO3)(6) (RE = Sm-Lu and Y) with Rare-Earth Ions on a Triangular Lattice: Synthesis, Crystal Structure, and Optical and Magnetic Properties
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三角形晶格上含有稀土离子的正硼酸盐 LiCdRE5(BO3)(6)（RE = Sm-Lu 和 Y）：合成、晶体结构以及光学和磁性
DOI：
10.1021/acs.inorgchem.7b00756
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发表时间：
2017
影响因子：
4.6
通讯作者：
Li R. K.
中科院分区：
文献类型：
--
作者：
Xia Mingjun;Zhai Kun;Lu Jun;Sun Young;Li R. K.
利用Li2O-B2O3助熔剂成功生长了LiCdY5(BO3)6单晶，并通过固相反应制备了其镧系同型化合物LiCdRE5(BO3)6(RE = Sm-Lu)。它们在非中心对称空间群 P6522 中结晶，晶胞参数范围为 a= 7.0989(2)–6.9337(1) Å 和 c= 25.9375(1)–24.8960(6) Å。作为一个代表性例子，LiCdY5(BO3)6 在 ab 平面上具有三角形晶格，由三个不同的晶体学 Y 位点组成。通过增强孤立的平面 BO3 基团和扭曲的 LiO4 四面体，以相同的护理距离间隔的三角形晶格进一步堆叠以构建三维框架。磁测量表明，Eu和Sm化合物表现出典型的Van Vleck型顺磁性，而其他稀土硼酸盐则表现出弱反铁磁行为。此外，还进行了紫外可见近红外漫反射和光致发光光谱，以了解活性稀土离子的跃迁能级及其与磁性的关系。
Single crystals of LiCdY5(BO3)6were successfully grown from a Li2O–B2O3flux, and its lanthanide homotypic compounds, LiCdRE5(BO3)6(RE = Sm–Lu), have been prepared by solid-state reaction. They crystallize in the noncentrosymmetric space groupP6522 with cell parameters in the ranges ofa= 7.0989(2)–6.9337(1) Å andc= 25.9375(1)–24.8960(6) Å. As a representative example, LiCdY5(BO3)6features a triangular lattice in theabplane composed of three distinct crystallographic Y sites. The triangular lattices spaced with the same distance ofcare further stacked to build three-dimensional frameworks by reinforcement of the isolated planar BO3groups and distorted LiO4tetrahedra. Magnetic measurements show that Eu and Sm compounds exhibit typical Van Vleck-type paramagnetism and other rare-earth borates show weak antiferromagnetic behavior. In addition, UV–vis–near-IR diffuse-reflectance and photoluminescence spectra were performed to understand the transition energy levels of active rare-earth ions and their relationships to magnetism.