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In the course of investigations on the phase relations in the Cu–Li–Sb system, two yet unknown ternary phases, namely Cu 1.5− x  Li 1+ x   Sb and Cu 4+ x  Li 1− x   Sb 2  were synthesized and characterized by powder and single crystal X-ray diffraction experiments. Both title compounds show hexagonal symmetry ( a =4.3593(10)/4.2512(9),  c =14.445(5)/22.336(7) Å, space groups  P 6 3  mc  and  P 6̅ m 2). Strong structural relations are evident among each other and to the compound Cu 2− x  Li 1− x   Sb ( a =4.3415(8),  c =7.448(2) Å, space group  P 6 3 / mmc ). The symmetry change of the different structures goes along with a multiplication of  c  whereas the lattice parameter  a  is roughly maintained. The Sb atoms are more or less ordered. Cu and Li atoms are extensively disordered, vacancies are common. The  sub structure formed by the Sb atoms is densely packed, the stacking sequence of the compounds Cu 1.5− x  Li 1+ x   Sb, Cu 4+ x  Li 1− x   Sb 2  and Cu 2− x  Li 1− x   Sb is ABAC, ABCACB, and AB, respectively.

The ternary phases Cu 1.5− x Li 1+ x Sb and Cu 4+ x Li 1− x Sb 2 , and their structural relations