Alkaline, Chalcogen, Disordered, Dielectric loss tangent, Trigonal

• Ba-Bi-Fe-O
• Ba-Ca-O-Ti-Zr
• Ba-O-Ti-Zr
• Ba-Bi-Fe-O-Ti
• Bi-Ca-Fe-O
• chalcogen
• disordered
• alkaline
• transitional
• oxide