Dy–Co–Si system at 870/1070 K

•The Dy–Co–Si section contains the nine known and five new ternary compounds.•New compounds the DyCo3Si2, DyCo2.56Si0.44, Dy3Co2Si7, DyCoSi3 and ∼Dy24Co14Si62.•The DyCo2.56Si0.44 and Dy3Co2Si3 have the Curie points of 165 and 17 K, respectively.•At 41 K DyCo2.56Si0.44 shows the second magnetic transition.•The Dy3Co2Si7 has the Neel point of 10 K.

X-ray phase analysis and microprobe analysis were employed in constructing the isothermal section of the Dy–Co–Si system at 870/1070 K. The isothermal section contains the known BaCd11-type DyCo8.5Si2.5, LaCo9Si4-type DyCo9Si4, CeGa2Al2-type DyCo2Si2, Lu2Co3Si5-type Dy2Co3Si5, TiNiSi-type DyCoSi, Hf3Ni2Si3-type Dy3Co2Si3, Sc2CoSi2-type Dy2CoSi2, CeNiSi2-type DyCo1…0.75Si2, Dy3Co2.2Si1.8-type Dy3Co2.2Si1.8 and new CeCo3B2-type DyCo3Si2, CeNi3-type DyCo2.56Si0.44, La3Co2Sn7-type Dy3Co2Si7, BaNiSn3-type DyCoSi3 ternary compounds and compounds with unknown type structure ∼DyCoSi3 and ∼Dy24Co14Si62.The ternary solid solution based on the binary compounds of the Dy–Co system (excepting Dy3Co), AlB2-type DyCo1.67 and ThSi2-type DySi2, were detected in the isothermal section at 870/1070 K. The other binary compounds of the Dy–Co–Si system do not show any visible solubility.The DyCo2.56Si0.44 and Dy3Co2Si3 phases show ferromagnetic ordering at 165 and 17 K. At 41 K DyCo2.56Si0.44 demonstrates second magnetic transition. The Dy3Co2Si7 has the Neel point 10 K.

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