Dy–Mn–Si as a representative of family of ‘Dy–Transition Metal–Si’ systems: Its isothermal sections, empirical rProd. Type: FTPules and new rare-earth manganese silicides

X-ray and microprobe analyses were employed for the investigation of Dy–Mn–Si system at 870/1070/1170K. The Dy–Mn–Si system, contains the known DyMn2Si2, DyMnSi and Dy2Mn3Si5 compounds and DyMn4Si2, Dy2MnSi2 and Dy3Mn2Si3 were new compounds identified first time and their structure are of the type TmCu4Sb2, Sc2CoSi2 and Hf3Ni2Si3 respectively. The quasi-binary solid solutions were detected at 870/1070/1170K: the ThMn12-type Dy8Mn87Si5, Th6Mn23-type Dy23Mn72Si5, MgCu2-type Dy33Mn58Si9 and AlB2-type Dy38Mn2Si58. The other binary compounds of the Dy–Mn–Si system do not show any visible solubility. New phases R2MnSi2 and R3Mn2Si3 (R=Gd, Tb, Ho–Tm) were found out and their structure of the type Sc2CoSi2 and Hf3Ni2Si3 respectively. The specific features of ‘Dy–Transition Metal–Si’ systems were discussed. The isothermal section of Dy–Mn–Si contains the known DyMn2Si2, DyMnSi, Dy2Mn3Si5 and new TmCu4Sb2-type DyMn4Si2, Sc2CoSi2-type Dy2MnSi2 and Hf3Ni2Si3-type Dy3Mn2Si3 ternary compounds. The ternary solid solution based on the binary compounds of the Dy–Mn and Dy–Si systems: the ThMn12-type Dy8Mn87Si5, Th6Mn23-type Dy23Mn72Si5, MgCu2-type Dy33Mn58Si9 and AlB2-type Dy38Mn2Si58. The other binary compounds of the Dy–Mn–Si system do not show any visible solubility. New Sc2CoSi2-type R2MnSi2 and Hf3Ni2Si3-type R3Mn2Si3 phases were discovered for R=Gd, Tb, Ho–Tm. [Display omitted] •The Dy–Mn–Si section contains three known and three new ternary compounds (phases).•New phase the TmCu4Sb2-type DyMn4Si2 compound.•New Sc2CoSi2-type R2MnSi2 and Hf3Ni2Si3-type R3Mn2Si3 were detected for R=Gd–Tm.•Dy–Mn–Si supplements the ‘Dy–3d metal–Si’ series and leads to the ‘RTmXn’ row's rule.