1987, Orthorhombic

• Ba-Cu-O-Y
• Ba-Cu-Gd-O
• Ba-Cu-Er-O
• Ba-Cu-Ho-O
• Ba-Cu-Dy-O
• structural properties
• magnetic properties
• electronic and electrical properties
• superconductivity
• thermal and thermodynamic properties
• non-disordered
• transitional
• chalcogen
• rare earth
• disordered