aforementioned rule, the Al–O–Al bridge bonds are not present in real aluminosilicate structures; hence, the distribution of [AlO 4 ] tetrahedra was assumed so
that they were not adjacent to each other.
Pseudomolecules constituting single rings have a symmetry markedly reduced in
relation to the one usually found for rings in real structures (they are clearly
deformed) [43]. The degree of deformation is greater in the case of 6-membered
rings and increases additionally with the increase in the number of [AlO 4 ] tetrahedra introduced into the model. The analysis of vibrations in the case of units
Fig. 10.6 Calculated spectra of D4R units—dependence on the degree of Si with Al substitution
310
M. Król et al.
that they were not adjacent to each other.
Pseudomolecules constituting single rings have a symmetry markedly reduced in
relation to the one usually found for rings in real structures (they are clearly
deformed) [43]. The degree of deformation is greater in the case of 6-membered
rings and increases additionally with the increase in the number of [AlO 4 ] tetrahedra introduced into the model. The analysis of vibrations in the case of units
Fig. 10.6 Calculated spectra of D4R units—dependence on the degree of Si with Al substitution
310
M. Król et al.