Crystal Structure of the New Ternary Antimonide Ho 5 GaSb 3

The crystal structure of the new ternary antimonide Ho 5 GaSb 3 has been determined from X-ray single-crystal data: space group Pnma, a = 7.9667(8), b = 15.128(2), c = 7.9616(8) Å , V = 959.5(3) Å 3 , Z = 4, R F = 0.059, R w = 0.066 for 9020 reflections. The crystal structure of Ho5GaSb3 is a ternary derivative of the Sm 5 Ge 4 structure type with partially ordered distribution of gallium and antimony atoms