Ba-Cu-O-Y, Tetrahedron 4-vertex, Values of magnetic susceptibility

• Ba-Cu-O-Y-Zn
• Ba-Cu-Ni-O-Y
• Ba-Co-Cu-O-Y
• Ba-Ca-Cu-O-Y
• rare earth
• transitional
• chalcogen
• alkaline
• high-tc superconductor
• orthorhombic
• tetragonal