Isothermal Section of the Co-Gd-Sn Ternary System Between 0 and 55 at.% Sn at 500 °C

Abstract

The isothermal section of the Co-Gd-Sn system between 0 and 55 at.% Sn at 500 °C was investigated by means of powder x-ray diffraction. Five ternary phases were identified or confirmed: Gd6Co2Sn, Gd3Co8Sn4, Gd3Co6Sn5, Gd4CoSn8, and Gd3Co4Sn13. A new ternary phase Gd117Co57Sn112 with Dy117Co57Sn112-type structure, space group \( Fm\bar{3}m \), and lattice parameter a = 3.0023 (4) nm was found. The ternary rare earth compound Gd3Co8Sn4 presents a homogeneity range of 20 to 27 at.% Sn along the 20 at.% Gd iso-concentration line. Comparison of this section with those of the Co-Gd-Sn system reported in the literature was made and the differences were discussed.