1. Department of Geochemistry; The Faculty of Geology; Moscow State University; Leninskie Gory st. 1 Moscow 119992 Russia
2. Laboratory of High Temperature Electrochemistry; The Institute of Experimental Mineralogy; The Russian Academy of Science; Akademika Osip'yana st. 4 Chernogolovka Moscow Region 142432 Russia
3. Department of Mechanical and Nuclear Engineering; The Pennsylvania State University; University Park Pennyslvania 16802 USA