Affiliation: | (1) Industrial Materials Group, Department of Crystallography, Birbeck College, Malet Street, WCIE 7HX London, UK;(2) Alcan Chemicals Ltd, Chalfont Park, SL9 0QB Gerrards Cross, Buckinghamshire, UK;(3) I.L.L., Avenue des Martyrs, 156 X, 38042 Grenoble, France |