Original paper
On the binding in A 1 . . 2-silicates
Schubert, K.
Neues Jahrbuch für Mineralogie - Abhandlungen Band 146 Heft 2 (1983), p. 210 - 220
22 references
published: May 17, 1983
DOI: 10.1127/njma/146/1983/210
ArtNo. ESP154014602006, Price: 29.00 €
Abstract
It is shown at the example of A1..2-silicates that the two-correlations model is a valence model also for this kind of three-component compounds. The valence electrons of the metal atoms form the b correlation and the peripheral core electrons of the metal atoms together with the valence electrons of the oxygen atoms form the c correlation. A compound becomes stable when a simple commensurability is possible between the correlation cells b and c and the crystal cell a. The silicates although octet valence compounds do not follow Zintl’s rule that the anions form a noble gas partial structure. This is caused by some kind of stress of the b electrons on the c correlation and thus on the crystal. Remarkably the occurring bindings are essentially all two-factorial isotypic. The hydraulic activity of certain A2-silicates appears to be consequence of their thermodynamic metastability at room temperature.
Keywords
Crystal chemistry • thermodynamics • silicates (of A1 and A2 elements) • crystal structure • bonding • electron (valence electrons) • model (two-correlations model) • classification of silicates