Petrakovskii

• Eu-La-Mn-O-Pb
• B-Fe-O-Tb
• Fe-O-Sm-Ti
• Fe-Mn-S
• B-Fe-Nd-O
• magnetic properties
• structural properties
• magnetization
• magnetic transitions
• magnetic susceptibility
• transitional
• chalcogen
• rare earth
• lanthanoid
• quaternary
• trigonal
• orthorhombic
• cubic
• tetragonal
• monoclinic