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a b s t r a c tThe solid-state phase equilibria in the Co-Pt-Ho ternary system at 1173 K(Ho ≤ 75%) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and energy dispersion spectroscopy (EDS) techniques. It is found that the 1173 K isothermal section consists of 14 single-phase regions, 24 two-phase regions, and 12 three-phase regions. At 1173 K, it is observed that the maximum solid solubility of Pt in Co 17 Ho 2 is below 1 at.% Pt, whereas in Co 7 Ho 2 , Co 3 Ho and Co 2 Ho it is about 1.5, 1 and 1.5 at.% Pt, respectively. The maximum solubility of Ho in ␣-(Co, Pt) is below 1.5 at.% Ho, and for Co it is below 1 at.% Co in