>I perfectly agree that many times lattice parameters and bond lengths >are to be given more confidence than occupation factors. It's the >canonical way to distinguish Al and Si in aluminosilicates
You could also try neutron powder diffraction :-) The scattering lengths (powers) of Al (3.449) and Si (4.151) are quite different, so it is easier to determine the relative occupancies of specific sites in aluminosilicates with neutrons - see: http://www.ncnr.nist.gov/resources/n-lengths/ Alan. Dr Alan Hewat, ILL Grenoble, FRANCE <[EMAIL PROTECTED]> fax (33) 4.76.20.76.48 (33) 4.76.20.72.13 (.26 Mme Guillermet) http://www.ill.fr/dif/AlanHewat.htm ___________________________________________________________
