Apatite, Rare earth, Electronic energy gap

• La-O-Si-Sr
• Ge-La-O-Sr
• B-La-O-Si
• Ca-La-O-Si
• Ga-La-O-Si
• values of electronic energy gap
• thermal energy gap
• rare earth
• apatite
• chalcogen
• disordered
• hexagonal
• trigonal
• monoclinic