Jj. Maguer et G. Courbion, SIMPLIFIED DESCRIPTION OF COMPLEX STRUCTURES FROM STACKINGS OF UGP, Journal of solid state chemistry, 128(1), 1997, pp. 52-61
A simplified description of complex structures is proposed. The method
consists in defining a geometrical unit of polyhedra, called UGP. The
n, a three-dimensional network is built up from simple stackings of th
ese UGP. Cationic sites and additional anionic sites are generated fro
m the stacking of UGP. An explicit formulation ''counterions[network]a
dditional ions'' summarizes the structure description. This method is
applied to numerous structures that involve square antiprisms and can
be used for other polyhedra. (C) 1997 Academic Press.