The magnetic properties of hexagonal Fe3Sn make it a promising phase for a new permanent magnet. Unfortunately the easy magnetic axis of this alloy lies in the hexagonal plane. Theoretical calculations to identify a possible substitutional alloy based on Fe3Sn, with uniaxial anisotropy, are reported by B. C. Sales et al . In this work the synthesis and investigation of alloys with nominal composition Fe3Sn1-xMx (M=Sb, P, x=0-0.25) are reported. The samples are produced by arc melting and mechanical alloying, and then annealed in the interval 800-1000 oC. The alloys exhibit various magnetic phases, the majority being Fe3Sn with extra phases of the type Fe5Sn3, α-Fe(Sn) and Fe3Sn2. The magnetic and structure characterisation of the samples with different heat treatments will be presented.  B.C. Sales, B. Saparov, M.A. McGuire, D.J. Singh, D.S. Parker, Scientific Report, 2014, DOI: 10.1038/srep07024. Supported by the EU project INAPEM.