Chalcogen, Rare earth, Transitional, Pressure for structural transition

• O-Sc-W
• Ba-Cu-O-Y
• Ho-O-V
• Dy-O-V
• O-Y
• chalcogen
• rare earth
• transitional
• lanthanoid
• oxide
• orthorhombic
• tetragonal
• monoclinic
• cubic
• trigonal