Al kheffaji

• Ba-Cu-Gd-O
• Cu-La-O-Sr
• Ce-Cu-Nd-O
• Ba-Cu-O-Y
• Cu-La-O
• mechanical properties
• elasticity
• elastic moduli
• elastic stiffness coefficient
• sound velocity
• cuprate
• rare earth
• high-tc superconductor
• chalcogen
• transitional
• tetragonal
• orthorhombic