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Synthesis and Structure of the Disordered Modification of Pb7F12Cl2

✍ Scribed by F. Kubel; H. Hagemann; H. Bill

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
121 KB
Volume
149
Category
Article
ISSN
0022-4596

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✦ Synopsis

We recently discovered a new compound with composition Ba 7 F 12 Cl 2 . It was possible to show that the variation of the synthesis conditions makes it possible to obtain a disordered and an ordered modi5cation with di4erent lattice parameters and space groups (P6 3 /m [176] and P6 [174]). For Pb 7 F 12 Cl 2 an ordered modi5cation is reported in the literature. In this paper we present the synthesis and structural characterization from X-ray di4raction data of the disordered modi5cation of Pb 7 F 12 Cl 2 . Single crystals were grown from a 6ux and the structure was re5ned in the hexagonal space group P6 3 /m to R(R w ) ‫؍‬ 0.043(0.038) for 284 re6ections and 26 parameters. Lattice parameters are a ‫؍‬ b ‫؍‬ 1021.90(8) pm and c ‫؍‬ 361.93(6) pm with Z ‫؍‬ 1. Propeller-type arrangements with chlorine as axis and 6uorines as blades are observed. The ordered modi5cation of Pb 7 F 12 Cl 2 was prepared by a new hydrothermal synthesis. Di4erences between both modi5cations are found in the lattice constants and atomic occupation parameters for the atom type Pb2 and the connected 6uorine ions.

πŸ“œ SIMILAR VOLUMES

Synthesis and Structure of Ba7F12Cl2
Synthesis and Structure of Ba7F12Cl2
✍ F. Kubel; H. Bill; H. Hagemann πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 German βš– 194 KB πŸ‘ 1 views

Crystals of ordered and disordered Ba 7 F 12 Cl 2 were prepared by flux growth and solid state reactions. These new structures were characterized by single crystal and powder X-ray diffraction. The disordered variant which shows disorder on one of the cation sites was obtained from a BaF 2 + BaCl 2

On the crystallochemical origin of the d
On the crystallochemical origin of the disordered form of Ba7(EuII)F12Cl2 and the structural changes induced at high temperature
✍ F. Kubel; H. Hagemann πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 276 KB

## Abstract The crystal structure of the disordered modification of Ba~7~F~12~Cl~2~ has been carefully re‐examined on several new crystals prepared under different conditions of synthesis. All single crystal structure refinements reveal a residual electron density of ∼3 e^–^/Γ…^3^ in the 0,0,0 posit