Katiyar, Transitional, Trigonal

• Bi-Fe-O
• Ca-Cu-O-Ti
• Nb-O-Pb-Sc
• Nb-O-Pb-Sc-Ta
• O-Pb-Sc-Ta
• electronic and electrical properties
• permittivity (dielectric constant)
• phonons
• optical properties
• magnetic properties
• transitional
• chalcogen
• oxide
• ferroelectric
• disordered