Apatite, Chalcogen, Rare earth, Electrical conductivity

• La-O-Si
• La-O-Si-Sr
• Ge-La-O
• Ge-La-O-Sr
• Co-La-O-Si
• rare earth
• apatite
• chalcogen
• disordered
• lanthanoid
• hexagonal
• trigonal
• monoclinic