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Diversity of Magadiite
Author(s) -
Scholzen G.,
Beneke K.,
Lagaly G.
Publication year - 1991
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19915970121
Subject(s) - potassium , alkali metal , silicate , reactivity (psychology) , crystallography , potassium silicate , chemistry , analytical chemistry (journal) , characterization (materials science) , mineralogy , materials science , organic chemistry , nanotechnology , medicine , alternative medicine , pathology
Some differences in intracrystalline reactivity reveal a structural variability of natural and synthetic magadiites which is more pronounced than originally expected from very similar or identical X‐ray powder patterns. A highly reactive potassium silicate is strongly related to magadiite but is not identical with the potassium form of magadiite. The structural variability becomes evident in the MAS‐NMR spectra. The Q 4 /Q 3 ratio of the individual samples varies over a broad range. The general formula of the layered alkali silicates (M = Na, K) is M z H x–z SiO 2+x/2 · x′H 2 O or M m H n–m Si 14 O 28+n/2 · xH 2 O where x/z is obtained from the Q 4 /Q 3 ratio and z is determined by chemical analysis. Values of X = 0.27–0.30 and z = 0.15–0.20 are abundant.