Bi-O-V, Fusion, V-x polyhedra

• Bi-Cu-O-V
• Bi-Ca-O-V
• Bi-O-Pb-V
• Bi-Co-O-V
• temperature for congruent melting
• transitional
• chalcogen
• pnictogen
• disordered
• tetragonal
• monoclinic
• orthorhombic
• trigonal
• triclinic