1. Dielectrics, Ferroelectrics & Multiferroics Group, Department of Physics, Alexandru Ioan Cuza University, 11 Bv. Carol I, 700506 Iasi, Romania
2. Institute of Condensed Matter Chemistry and Technologies for Energy, Department of Genoa, National Research Council, Via De Marini 6, 16149 Genoa, Italy
3. Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy