Ba-Cu-O-Y, Mechanical properties, Tetrahedron 4-vertex

• Ba-Ca-Cu-O-Y
• Ba-Cu-Fe-O-Y
• Ba-Cu-O-Sr-Y
• Ba-Co-Cu-O-Y
• elastic moduli
• sound velocity
• compressibility
• elasticity
• isothermal bulk modulus
• transitional
• alkaline
• chalcogen
• rare earth
• disordered
• orthorhombic
• tetragonal