The crystal structure of Mo9Fe4.75Al0.25 has been solved by the single- cry
stal X-ray analysis (KM-4 diffractometer, Mo K alpha radiation). This compo
und crystallises in tetragonal system, space group I4/mcm, a=12.683 Angstro
m, c=4.383 Angstrom, Z=4, R=0.038 for 268 unique reflections and 26 variabl
es. The structure represents partially disordered Nb9Co4Ge type of structur
e. Only 4(a) position is occupied by Fe and Al atoms statistically. (C) 199
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