Ba-Ca-Cu-O-Tl, Square pyramid 5-vertex, Structural properties, Transitional

• Ba-Ca-Cu-Hg-O-Tl
• Ba-Ca-Cu-Hg-O-Tl-Y
• Ba-Ca-Cu-O-Pb-Sr-Tl
• Ba-Ca-Cu-Hg-O-Sr-Tl
• thermal and thermodynamic properties
• thermal expansion
• thermal cell parameters change
• transitional
• oxide
• alkaline
• chalcogen
• disordered
• tetragonal