1. Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
2. National Institute of Materials Physics, Atomiștilor 405A, 077125 Măgurele, Romania
3. Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, “Politehnica” University of Bucharest, 1–7 Gh. Polizu, 011061 Bucharest, Romania