Opening book details…
Can I read Na~8.25~Y~1.25~Si~6~O~18~ and its family of zwölfer ring silicates on EtoBox?
Na~8.25~Y~1.25~Si~6~O~18~ and its family of zwölfer ring silicates by Daniel M. Többens; Volker Kahlenberg; Reinhard Kaindl; Bernhard Sartory; Jürgen Konzett is a Materials Science article available to read on EtoBox.
What is Na~8.25~Y~1.25~Si~6~O~18~ and its family of zwölfer ring silicates about?
## Abstract The crystal structure of a sodium yttrium silicate with nominal composition Na~9~YSi~6~O~18~ was determined from laboratory X-ray powder diffraction. The actual composition of the crystals was found to be Y-enriched, and a corrected nominal composition of Na~8.25~Y~1.25~Si~6~O~18~ was established. The compound is cubic with space group __Pa__−3 and unit cell parameter of __a__ = 15.120 Å. The structure consists of twelve-membered rings of corner-connected SiO~4~-tetrahedra, which are arranged around the 3-fold axes of the structure. It is isostructural with K~4~SrGe~3~O~9~ and Na~4~CaSi~3~O~9~. A profound disorder results from the absence of any stochiometric composition. The existence of a simultaneous occurrence of two different conformations of the rings relates to the various ordered and disordered cation positions in the structure. Micro-Raman spectra obtained from the polycrystalline material confirm the observed disorder. A model explaining the conformational variations appearing in this structure type was derived from a systematic comparison of isostructural compounds.
Who reads Na~8.25~Y~1.25~Si~6~O~18~ and its family of zwölfer ring silicates?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Daniel M. Többens; Volker Kahlenberg; Reinhard Kaindl; Bernhard Sartory; Jürgen Konzett
- Publisher
- Oldenbourg Wissenschaftsverlag; Walter de Gruyter GmbH (ISSN 2194-4946)
- Published
- 2008
- Language
- EN
- Field
- Materials Science (Physical Sciences)