Sr4Cu25.37(18)Sb12 and Eu4Cu26.06(13)Sb12: Copper-Rich Antimonide Intermetallics with Cage Structure
Sr4Cu25.37(18)Sb12 and Eu4Cu26.06(13)Sb12: Copper-Rich Antimonide Intermetallics with Cage Structure
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Sr4Cu25.37(18)Sb12 和 Eu4Cu26.06(13)Sb12：笼状结构富铜锑化物金属间化合物
DOI：
10.1021/acs.cgd.7b01645
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发表时间：
2018-01
影响因子：
3.8
通讯作者：
Xia Sheng-Qing
中科院分区：
文献类型：
--
作者：
Zhu Min;Tan Wen-Jie;Wu Zhen;Tao Xu-Tang;Huang Bai-Biao;Xia Sheng-Qing
采用高温助熔剂法合成了两种新的富铜锑化物极性金属间化合物Sr 4Cu 25. 37（18）Sb 12和Eu 4Cu 26. 06（13）Sb 12，并通过单晶X射线衍射技术对其结构进行了准确的测定。Sr_4Cu_25.37（18）Sb_（12）和Eu_4Cu_26.06（13）Sb_（12）晶体具有各自的结构类型，空间群为Cmcm（No.63）（晶胞参数：a = 4.3200（7）/4.2874（7）A，B = 14.528（2）/14.611（2）A，c = 12.2594（19）/12.1946（19）A）。这些化合物的阴离子骨架可以被描述为由16-顶点Cu 10 Sb 6多面体组成，其形成填充有阳离子的共边笼。一个简单的电子计数意味着，在化学计量组成Sr 4Cu 28 Sb 12或Eu 4Cu 28 Sb 12应该是电子精确的，然而，金属导电性能所测得的电输运性能，以及由广泛的Cu空位的结构。Eu4Cu26.06（13）Sb 12单晶的磁化率测量
Two new copper-rich antimonide polar intermetallics, Sr4Cu25.37(18)Sb12 and Eu4Cu26.06(13)Sb12, were synthesized through high-temperature flux reactions, and their structures were accurately determined through the single-crystal X-ray diffraction technique. Sr4Cu25.37(18)Sb12 and Eu4Cu26.06(13)Sb12 crystallize in their own structure type with an orthorhombic space group Cmcm (No. 63) (cell parameters: a = 4.3200(7)/4.2874(7) A, b = 14.528(2)/14.611(2) A, c = 12.2594(19)/12.1946(19) A, respectively). The anionic frameworks of these compounds can be described as composed of 16-vertex Cu10Sb6 polyhedra, which form edge-sharing cages filled with the cations. A simple electron counting implies that the on-stoichiometric composition as Sr4Cu28Sb12 or Eu4Cu28Sb12 should be electron-precise; however, metallic conducting properties were suggested by the measured electrical transport properties as well as by the extensive Cu vacancies in the structure. Magnetic susceptibility measurements on Eu4Cu26.06(13)Sb12 indi...