The crystal structure of synthetic zeolite Na-P 1, an isotype of gismondine
Abstract
The crystal structure of synthetic zeolite Na-P 1 (or B1) has been solved using x-ray data obtained from a multiply twinned crystal. The structure is shown to be based on a gismondine-type framework with maximum possible symmetry I41/amd. The cell dimensions were found to be a = c = 10.04 Å but the intensity data clearly indicated noncubic symmetry. Weak b reflections with h + k + l = 2n + 1 have also been recorded but were not used in this investigation. Refinement assuming space group I[unk] proceeded to an intensity R value of 0.077. The true symmetry must be lower and the structure appears to be highly pseudosymmetric.
The typical spherulitic aggregates of most Na-P 1 preparations are thought to be submicroscopically twinned. The formation of twins is favoured by the topology and the extraordinary flexibility of the framework. Its flexibility also explains the comparatively large variations in cell dimensions and apparent symmetry of known gismondine isotypes, and could account for the occurrence of various P phases.
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Articles in the same Issue
- The crystal structure of FeCoOBO3
- The crystal structure of synthetic zeolite Na-P 1, an isotype of gismondine
- Crystal structure of babingtonite
- The structures of the salt-bearing aluminosilicates, Species P and Q
- Über eine neue Tracht von WO3
- The structure of strontium dithionate tetrahydrate
- The crystal and molecular structure of naphtho[2,1-c]cinnoline
- Verfeinerung der Struktur von Azurit, Cu3(OH)2(CO3)2, durch Neutronenbeugung
- Die Kristallstruktur von Ba13Al22Si10O66
- Redetermination of the chromium position in ruby
- Determination of heavy atom positions by computer from the Patterson function through identification of non-Harker vectors
- Zur Darstellung und Raumgruppe des Caesium-Zinkazides Cs2Zn(N3)4
- The crystal data for the dinitrodialaninatocobaltates of K, Na and Ag
- 13. Diskussionstagung der Sektion für Kristallkunde der Deutschen Mineralogischen Gesellschaft
- The Warren Award
