Cu-Hg, Fusion, Tetragonal

• Ba-Ca-Cu-Hg-O-Re
• Ba-Cu-Hg-O-Tl
• Ba-Ca-Cu-Hg-O
• Ba-Ca-Cu-Hg-O-Pb
• Ba-Ca-Cu-Hg-O-Pb-Y
• temperature for congruent melting
• transitional
• chalcogen
• disordered
• oxide