Disordered, Quaternary, Transitional, Kim, Tetragonal

• As-Ba-Co-Fe
• K-Li-Nb-O
• As-Ba-Fe-K
• Nb-O-Sr-Ti
• As-Ba-Fe-Li
• magnetic properties
• electronic and electrical properties
• superconductivity
• optical properties
• structural properties
• transitional
• quaternary
• disordered
• conductor
• alkaline