Chalcogen, Transitional, Kartashev

• Na-Nb-O
• B-Fe-Gd-Nd-O
• Fe-O-Sm-Ti
• Fe-Ge-Li-O
• Eu-La-Mn-O-Pb
• magnetic properties
• thermal and thermodynamic properties
• magnetic transitions
• structural transitions
• phase transitions
• chalcogen
• transitional
• oxide
• alkali
• nonmetal
• orthorhombic
• trigonal
• monoclinic
• cubic
• tetragonal