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Abstract
The isothermal section of the phase diagram of the Tb–Dy–Co ternary system at 773 K was investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscope (SEM). The result shows that this section consists of 9 single-phase regions and 8 two-phase regions, and no three-phase region. The compounds Tb 2Co 17 and Dy 2Co 17, Tb 2Co 7 and Dy 2Co 7, TbCo 3 and DyCo 3, TbCo 2 and DyCo 2, Tb 4Co 3 and Dy 4Co 3, Tb 12Co 7 and Dy 12Co 7, Tb 3Co and Dy 3Co form a continuous series of solid solutions. The single phases Tb and Dy also form a continuous solid solution. The binary compounds TbCo 5 and DyCo 5 were not observed at 773 K. No ternary compound was found. In addition, we experimentally determined the vertical section of pseudobinary system and magnetic property of Tb 1− x Dy x Co 2 ( x from 0 to 1) series alloys, T c decreases and the maximum magnetic entropy change |Δ S M,max | increases with the increase of Dy content. The Arrott plots and the change of |Δ S M,max | show that magnetic phase transition from second-order to first-order occurs with the increase of Dy content between x = 0.6 and 0.8.
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