School of Metallurgy and Environment , Central South University , Changsha 410083 , China.
Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3113 , United States.
Inorg Chem. 2018 Jul 2;57(13):7950-7956. doi: 10.1021/acs.inorgchem.8b01087. Epub 2018 Jun 15.
Single crystals of two new metal tellurates Bi MTeO ( M = Al, Ga) with a honeycomb layered structure were obtained by the molten flux method and characterized. The Bi MTeO compounds both crystallize into a non-centrosymmetric trigonal space group of P312 (no. 149) with cell parameters of a = 5.0667(8) Å, c = 4.9920(16) Å and a = 5.107(3) Å, c = 4.932(6) Å, respectively. The non-centrosymmetry of BiAlTeO and BiGaTeO originates from the packing order of the octahedra. In these two structures, TeO octahedra and MO octahedra share edges and form a honeycomb open-framework with [Te MO] layers. The layers of [ MTeO] and [BiO] alternate and are connected along the c-axis by corner-sharing oxygen atoms to form the three-dimensional framework. The chiral compound BiGaTeO exhibits a powder second harmonic generation (SHG) response of ∼0.2 times that of potassium dihydrogen phosphate (KDP) and an absorption edge of 355 nm.
采用熔盐法合成了两种新型金属碲酸盐 BiMTeO（M=Al，Ga）单晶，并用 X 射线单晶衍射法对其结构进行了表征。BiMTeO 化合物均属于非中心对称的三方晶系 P312（No.149）空间群，晶胞参数分别为 a=5.0667(8) Å，c=4.9920(16) Å 和 a=5.107(3) Å，c=4.932(6) Å。BiAlTeO 和 BiGaTeO 的非中心对称源于八面体的堆积顺序。在这两个结构中，TeO 八面体和 MO 八面体共享边，形成具有[TeMO]层的蜂窝状开放式骨架。[MTeO]和[BiO]层交替排列，并通过顶角共享氧原子沿 c 轴连接，形成三维骨架。手性化合物 BiGaTeO 的粉末二次谐波产生（SHG）响应约为磷酸二氢钾（KDP）的 0.2 倍，吸收边缘为 355nm。
