Affiliation: | a Chemieservice, Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany b Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russian Federation c Russian Research Centre Kurchatov Institute, 123182 Moscow, Russian Federation d VITCON Projectconsult GmbH, 07745 Jena, Germany |