Nan Number of different silicate anions in a silicate Nan = 1 uniform-anion silicates, Nan> I mixed-anion silicates.ĮN Coordination number of silicon: Number of oxygen atoms directly bonded to a silicon atom. P' Ring periodicity: Number of polyhedra, excluding branches, of a funda- mental ring. P Chain periodicity: Number of polyhedra, excluding branches, in the repeat unit of a fundamental chain. M Multiplicity: Number of single polyhedra, rings, chains or layers which are linked to a complex anion of the same dimensionality. D = 0 (groups), D = 1 (chains), D = 2 (layers), D = 3 (frameworks). D Dimensionality: Number of dimensions of infinite extension of an anion. Types of branched anions include: open-branched (oB) and loop-branched (IB) fundamental and complex anions, in which each "branch" is attached to the "stem" by one or by more than one corner, edge or face respectively mixed-branched (olB) fundamental and complex anions are open- as well as loop- branched hybrid (hB) complex anions are formed by linking unbranched with branched fundamental anions. Branched (br) anions: Fundamental anions containing polyhedra with s 2 3 and complex anions formed by linking such fundamental anions. B Branchedness: Unbranched (uB) anions: Fundamental anions containing polyhedra with s:o 2 and complex anions formed by linking such fundamental anions. Complex anions: Multiple rings, multiple chains, and layers and frameworks which are formed by linking fundamental anions. Fundamental anions: Single and multiple polyhedra, single rings and single chains. s Connectedness: Number of polyhedra that share oxygen atoms with the polyhedron considered. L = 0 (isolated), L = I (corner-sharing), L = 2 (edge-sharing), L = 3 (face- sharing). L Linkedness: Number of oxygen atoms shared between two adjacent poly- hedra. Classification Parameters and Terms eN Coordination number of silicon: Number of oxygen atoms directly bonded to a silicon atom.
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