Hydrothermal synthesis and characterization of nitrite sodalite single crystals
- authored by
- J. Ch Buhl
- Abstract
Single crystals of nitrite sodalite Na8[AlSiO4]6(NO2)2 prepared hydrothermally at 570 K and 0.1 GPa show cubic symmetry (a0 = 8.931(2) A ̊) and complete ordering of the framework T atoms (SG P43n). The thermal properties have been characterized by simultaneous thermal analysis (TG, DTG, DTA) and high temperature X-ray powder diffraction. Heating in air yields a nitrite/nitrate sodalite according to the oxidation of the enclosed salt molecules. This intra-cage reaction is characterized by IR spectroscopy and thermogravimetry under open system conditions. Additional X-ray powder diffraction data (Guinier-Simon heating technique) indicate an expansion of the sodalite framework during this formation of nitrate within the β-cages at 1000 K. The thermal decomposition of nitrite sodalite in an inert atmosphere (argon) occurs in the 950-1100 K interval, yielding a stuffed carnegieite phase.
- Organisation(s)
-
Institute of Mineralogy
- External Organisation(s)
-
University of Münster
- Type
- Article
- Journal
- Journal of crystal growth
- Volume
- 108
- Pages
- 143-149
- No. of pages
- 7
- ISSN
- 0022-0248
- Publication date
- 02.01.1991
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Condensed Matter Physics, Inorganic Chemistry, Materials Chemistry
- Electronic version(s)
-
https://doi.org/10.1016/0022-0248(91)90362-9 (Access:
Closed)
