Chalcogen, Lanthanoid, Rare earth, Thermal energy gap

• Co-La-O-Sr
• Bi-F-La-O-S
• Bi-Ce-F-O-S
• Ba-Co-La-O
• Ag-Ce-K-Te
• lanthanoid
• chalcogen
• rare earth
• transitional
• disordered
• tetragonal
• orthorhombic
• cubic
• trigonal
• monoclinic