Quetzalcoatlite: A new octahedral-tetrahedral structure from a 2 × 2 × 40 μm3 crystal at the Advanced Photon Source-GSE-CARS Facility
Quetzalcoatlite: A new octahedral-tetrahedral structure from a 2 × 2 × 40 μm3 crystal at the Advanced Photon Source-GSE-CARS Facility
复制标题
Quetzalcoatlite：先进光子源 GSE-CARS 设施中 2 × 2 × 40 μm3 晶体的新型八面体-四面体结构
DOI：
10.2138/am-2000-0424
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
R. Housley
中科院分区：
文献类型：
--
作者：
P. Burns;J. Pluth;J. V. Smith;P. Eng;I. Steele;R. Housley
利用在先进光子源-GSE-汽车装置上收集的2 × 2 × 40 μ m ~ 3单晶数据，求解并修正了锌钙石Zn_6Cu_3（TeO_3）_2O_6（OH）_6（AgxPby）Clx+2 y，x + y ≤ 2，Z = 1的结构。其结构为三方晶系，空间群P3 <$1m，a = 10.145（1），c = 4.9925（9）<$1m，V = 445.0（1）<$3，并对395个独特的观测反射进行了修正，R = 5.1。Te 6 + O 6八面体和Jahn-Teller畸变的Cu 2 + O 4（OH）2八面体共享边缘形成平行于（001）的层，而ZnO 2（OH）2四面体共享顶点形成平行于（001）的六元环。八面体和四面体的层沿c沿着排列，通过顶点共享形成新的骨架结构。通过平行于c的框架的通道被Ag、Pb和Cl离子占据。电子探针分析显示，Ag和Cl被忽略在原来的微量化学分析。高达三分之一的银被铅取代，可能存在富铅类似物。
Abstract The structure of quetzalcoatlite, Zn6Cu3(TeO3)2O6(OH)6(AgxPby)Clx+2y, x + y ≤ 2, Z = 1, was solved and refined using data collected at the Advanced Photon Source-GSE-CARS facility, using a 2 × 2 × 40 μm3 single crystal. The structure is trigonal, space group P3̅1m, a = 10.145(1), c = 4.9925(9) Å, V = 445.0(1) Å3, and was refined to R = 5.1 for 395 unique observed reflections. Te6+O6 octahedra and Jahn-Teller distorted Cu2+O4(OH)2 octahedra share edges to form layers parallel to (001), and ZnO2(OH)2 tetrahedra share vertices to form six-member rings parallel to (001). Layers of octahedra and tetrahedra alternate along c, and form a new framework structure by vertex sharing. Channels through the framework parallel to c are occupied by Ag, Pb, and Cl ions. Electron microprobe analysis revealed Ag and Cl overlooked in the original microchemical analysis. Up to one-third of the Ag was substituted by Pb, and a Pb-rich analog may exist.