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Abstract
The isothermal section of the phase diagram of the Dy–Ho–Co ternary system at 773 K has been investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA), optical microscopy and scanning electron microscopy (SEM) techniques. The existence of 14 binary compounds Dy 2Co 17, Ho 2Co 17, Dy 2Co 7, Ho 2Co 7, DyCo 3, HoCo 3, DyCo 2, HoCo 2, Dy 4Co 3, Ho 4Co 3, Dy 12Co 7, Ho 12Co 7, Dy 3Co and Ho 3Co have been confirmed in this system at 773 K. The Dy and Ho, Dy 2Co 17 and Ho 2Co 17, Dy 2Co 7 and Ho 2Co 7, DyCo 3 and HoCo 3, DyCo 2 and HoCo 2, Dy 4Co 3 and Ho 4Co 3, Dy 12Co 7 and Ho 12Co 7, Dy 3Co and Ho 3Co form continuous solid solutions, respectively. No ternary compound was found. The isothermal section consists of nine single-phase regions and eight two-phase regions. There is no three-phase region in the isothermal section.
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