Cluster self-organization of silicate and germanate systems: suprapolyhedral precursor clusters and self-assembly of orthotetrahedral structures in Na,TR- germanates (silicates)

One carried out the computer base geometric and topological analyses of all available types of Na, TR-germanate orthotetrahedral structures and of their Si-analogs. One managed to ensure the complete 3D-reconstruction of the self-assembling of the crystalline structures, namely: the cluster-precursor-source chain-microlayer-microskeleton (the superprecursor). TR 433334 + T 4433. 2D TR,T common net was revealed for Na2HLaSi05, NaHo4(GeO4)2O2OH, NaScGeO4 and NaSm3Ge2O8(OH)2. For Na2HScGe05 one revealed TR 44444 + T 444 net. The coordination numbers (CN) of the cluster-precursor in the 2D-nets are equal to 6. Within all the structures one identified the invariant type of the cyclic four-polyhedral cluster-precursor consisting of the tetrahedron bound TR-polyhedrons varying in the CN values (8, 7 or 6). Within Na5Y4Si4O16F structure one revealed the tubular source chain of the clusters-precursors represented by the TR-polyhedrons with CN 8 bound by the tetrahedrons. Their packing within the layer is characterized by TR 884 + T 848 TR,T-net where number 8 characterizes the source chain cross section. Within 3D-net the total number of the neighboring source tubular chains bound with the basic chain is equal to 4. Within the structures with TR : T = 1 : 1 and 1.5 : 1 the positions above and beneath the cluster-precursor centre are occupied by Na atoms, in NaHo4(GeO4)2O2(OH) with TR : T = 2 : 1 increased content - by Na atom and TR