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使用一种新的高温固相反应方法合成得到了五个新的异质同构的四元稀土硫化物.它们结晶于六方晶系的手性空间群P63,属于ALn3EQ7(A:碱金属或货币金属;Ln:稀土元素;E:第IVA族元素;E:硫属元素)结构类型,晶胞参数为a=9.621(1)～10.038(2),c=5.672(2)～5.939(1),V=476.1(1)～494.9(2)3,Z=2.它们的晶体结构可以描述为:LnS8双帽三棱柱之间相互连接成三维框架结构,而A位和E位原子分别占据所形成的八面体和四面体空隙.化合物4的光学和磁性质的研究表明:它是光学带隙为2.34eV的半导体,并表现出类似于反铁磁相互作用的磁行为.
Five new isomorphic quaternary rare-earth sulfides were synthesized using a new high-temperature solid-state reaction method. They crystallize in a hexagonal chiral space group P63 belonging to ALn3EQ7 (A: alkali metal or currency (Ln: rare earth element; E: Group IVA element; E: chalcogen) structure type with unit cell parameters of a = 9.621 (1) to 10.038 ) , V = 476.1 (1) ~ 494.9 (2) 3, Z = 2. Their crystal structure can be described as: LnS8 double cap triangular prism connected to each other into a three-dimensional framework structure, and A bit and E bit atom Respectively occupy the voids formed by the octahedron and tetrahedron.Studies on the optical and magnetic properties of the compound 4 show that it is a semiconductor with an optical band gap of 2.34 eV and shows a magnetic behavior similar to the antiferromagnetic interaction.