Bi-Ca-Fe-O, Ca-x polyhedra, Magnetic properties, Trigonal

• Bi-Ca-Fe-O-Ti
• Bi-Ca-Fe-Nb-O
• Bi-Ca-Fe-Mn-O
• magnetization
• Moessbauer spectra
• magnetic hysteresis
• values of magnetization
• coercive field
• alkaline
• chalcogen
• antiferromagnetic
• disordered
• oxide