1. Department of Inorganic Chemistry, Faculty of Chemical Technology, Prague University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
2. Chair of Ceramics, Institute of Mineral Engineering (GHI) RWTH Aachen University, Forckenbeckstrasse 33, Aachen 52074, Germany
3. Department of Energy Engineering, Gyeonsang National University, Jinju-si 52725, Gyeongnam, South Korea