Chalcogen, Lanthanoid, Rare earth, Ijpbev

• Ba-Cu-O-Pr-Y
• Eu-S
• La-Mn-O-Sr
• Ba-Cu-La-O
• Cu-La-O-Sr
• structural properties
• chalcogen
• rare earth
• lanthanoid
• transitional
• alkaline
• orthorhombic
• tetragonal
• cubic
• trigonal