Magnetic, thermal, and electric properties of alloys of the systems FeNi, NiCr, FeNi‐Mn, and FeNi‐Cr are studied. Itis shown that in alloys of the systems FeNi and NiCr, spin glass does not appear. The form of phase diagrams of the quasi‐binary systems Mn20FexNi80 − xFe50Ni5o −xMnx, Fe65Ni35 −xCrx, and Cr10FexNi90 −x is determined. The diagrams are compared with the character of variation of susceptibility, heat capacity, and magnetoresistance at a concentration magnetic transition. The investigationof the behaviour of nonlinear susceptibility of FeNiCr(Mn) spin glasses in the vicinity of the ‘freezing’ point, Tf, provides evidence for the presence of a phase transition. The variation in the properties at the double temperature transition, paramagnetism‐ferromagnetism‐spin glass is considered.

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