Chalcogen, Conductor, Transitional, Sound velocity, Tetragonal

• Bi-Ca-Cu-O-Sr
• Ba-Cu-O-Y
• Cu-La-O-Sr
• Ba-Cu-Gd-O
• Cu-La-O
• longitudinal sound velocity
• values of sound velocity
• transverse sound velocity
• transitional
• chalcogen
• conductor
• semiconductor
• metal