Penfold

• Ba-Cu-O-Y
• Cl-Cs-H-Ir-O
• Cl-Ir-K
• C-Co-O
• Cl-K-Tc
• structural properties
• transitional
• non-disordered
• halogen
• chalcogen
• cubic
• orthorhombic
• triclinic
• monoclinic
• tetragonal