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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