Columbite

• Fe-Nb-O
• Fe-Mn-Nb-O-Ta
• Fe-Mn-Nb-O
• Fe-Mn-Nb-O-Ta-Ti-W
• Fe-Mn-Nb-O-Ta-Ti
• structural properties
• thermal and thermodynamic properties
• magnetic properties
• magnetic susceptibility
• phase transitions
• transitional
• columbite
• oxide
• chalcogen
• disordered
• orthorhombic