Trois phases du ternaire CuTlS

Insight on a novel layered semiconductors: CuTlS and CuTlSe

“…In the next members, n=2, 3, (Cu 4 TlS 3 , [4] and Cu 6 TlS 4 [5]), the slabs of tetrahedral contain 2 and 3 layers CuS 4 respectively. Although no more compounds with n>3 are found in literature, it can be assumed that they form similar structures with n(CuS 4 ) tetrahedral layers per slabs, ending with the limit n=∞ structure of Cu 2 S. Structures for composition with odd number of Cu atoms in the formula have been reported for CuTlS 2 [6], Cu 3 TlS 2 [7] and Cu 7 TlS 4 [8]. The structures of these compounds are topologically different from each other and from the previous series.…”

“…The systems Cu-Tl-X (X=S, Se) include series compounds with the general formula TlCu 2n Xn +1 (X=S, Se) [3][4][5][6][7][8][9]. The structures can be described by stacking layers of n(CuX 4 ) tetrahedra sandwiched between single Tl-planes.…”