High-temperature superconductivity
Bi-, Tl- and Hg-based high-  c  superconductors
Columns: Formula | Notation | T c (K) | No. of Cu-O planes in unit cell | Crystal structure
YBa 2 Cu 3 O 7 | 123 | 92 | 2 | Orthorhombic | Bi 2 Sr 2 CuO 6 | Bi-2201 | 20 | 1 | Tetragonal | Bi 2 Sr 2 CaCu 2 O 8 | Bi-2212 | 85 | 2 | Tetragonal | Bi 2 Sr 2 Ca 2 Cu 3 O 6 | Bi-2223 | 110 | 3 | Tetragonal | Tl 2 Ba 2 CuO 6 | Tl-2201 | 80 | 1 | Tetragonal | Tl 2 Ba 2 CaCu 2 O 8 | Tl-2212 | 108 | 2 | Tetragonal | Tl 2 Ba 2 Ca 2 Cu 3 O 10 | Tl-2223 | 125 | 3 | Tetragonal | TlBa 2 Ca 3 Cu 4 O 11 | Tl-1234 | 122 | 4 | Tetragonal | HgBa 2 CuO 4 | Hg-1201 | 94 | 1 | Tetragonal | HgBa 2 CaCu 2 O 6 | Hg-1212 | 128 | 2 | Tetragonal