Chalcogen, Karpinsky

• Bi-Fe-O-Sm
• Bi-Fe-La-O
• Co-Fe-La-O
• Bi-Ca-Fe-O
• Ba-Co-Fe-O-Tb
• structural properties
• magnetic properties
• magnetization
• values of magnetization
• Moessbauer spectra
• chalcogen
• transitional
• disordered
• oxide
• rare earth
• orthorhombic
• trigonal
• tetragonal
• cubic
• monoclinic