1. Institute of Inorganic
Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
2. Conditions Extrêmes ét Materiaux:
Haute Température et Irradiation, UPR 3079−CNRS Univ. Orléans 450 71, Orléans, France
3. Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia