The substitution of silicon for germanium in Mn_{5}Ge_{3} leads to a decrease in the magnetization for x < 0.7 and then to phase transition toward a non-collinear antiferromagnetic order for Mn_{5}Si_{3}. The magnetic properties of Mn_{5}Ge_{3} and Mn_{5}(Ge_{0.5}Si_{0.5})_{3} are analyzed by means of band structure calculations.
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