1. Dipartimento di Chimica, Universita di Sassari, Italy, Dipartimento di Ingegneria dei Materiali, Universita di Trento, Italy, Chimie de la Matière Condensée, UPMC, Paris, France, Laboratoire de Céramiques Nouvelles, Université de Limoges, France, Institute of Materials Research, University of Bayreuth, Germany, School of Chemical Sciences, University of East Anglia, U.K., and belChem, Brand-Erbisdorf, Germany