1. Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, 2 rue de la Houssinière, B.P. 32229 44322 Nantes, Cedex 3, France Materials Research Laboratory, University of California Santa Barbara, California 93106 Institute of Chemical Physics and Biophysics Akadeemia Tee 23, Tallinn, Estonia and the National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida Humboldt-Universität, Institut für Chemie Berlin, D-10117, Germany Materials Sciences Division E.O. Lawrence...