1. Alexandru Ioan Cuza University; Bv. Carol I No. 11; Iasi; 700506; Romania
2. Institute of Energetics and Interphases IENI-CNR; Via De Marini No. 6; Genoa; I-16149; Italy
3. Department of Oxide Materials Science & Engineering; Polytechnics University; 1-7 Gh. Polizu, P.O. Box 12-134; Bucharest; 011061; Romania