De graaff

• Ba-Cl-O-Os
• Ca-Hf-O-Si
• Fe-Na-O
• Ca-O-Si-Zr
• O-Si-Sr-Zr
• structural properties
• non-disordered
• chalcogen
• alkaline
• quaternary
• monoclinic
• triclinic
• hexagonal
• cubic
• trigonal