Alkali, Chalcogen, Tetragonal

• Fe-K-Se
• H-K-O-P
• Ba-Bi-Na-O-Ti
• K-Na-Nb-O
• As-H-K-O
• thermal and thermodynamic properties
• electronic and electrical properties
• structural properties
• phase transitions
• optical properties
• chalcogen
• alkali
• transitional
• disordered