The series of the half-Heusler compounds CoTi_1-xMn_xSb, starting with the Pauli paramagnetic semiconductor CoTiSb and ended by ferromagnetic metal CoMnSb, have been prepared. Polycrystalline samples were obtained by arc furnace melting and annealed at 700 C for one week. All samples crystallise with the MgAgAs regular structure. For composition with x > 0.6 superstructure lines, corresponding to a doubled cell parameter, appear. The concentration dependence of the lattice parameter does not follow Vegard's law. The ferromagnetic ground state appears in the system when 20% of Ti are replaced by Mn.

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