1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center, Russian Academy of Sciences, Fersman st. 26a, Apatity, Murmansk region, 184209 Russia, Division of Chemistry, Luleå University of Technology, 97187 Luleå, Sweden, and SunPine AB, Box 76, 941 22 Piteå, Sweden