Chalcogen, Non-disordered, Rare earth, Pressure for structural transition

• O-Sc-W
• Eu-O
• Ba-Cu-O-Y
• O-Sm
• Ce-O
• non-disordered
• chalcogen
• rare earth
• lanthanoid
• transitional
• cubic
• tetragonal
• monoclinic
• orthorhombic
• trigonal