Electrical resistivity and Curie temperature studies on image intermetallics Original Research Article

This paper looks at synthesis, electrical resistivity and Mössbauer effect studies on intermetallic compounds (Y1−xGdx)(Fe0.7Co0.3)2(Y1−xGdx)(Fe0.7Co0.3)2. Cubic Laves phase of MgCu2-type were observed across the series. The lattice parameters linearly increase with Gd concentration and the lattice parameters of the intermetallics series (Y1−xGdx)(Fe0.7Co0.3)2(Y1−xGdx)(Fe0.7Co0.3)2 are compared to data previously observed for the R(Fe1−xCox)2R(Fe1−xCox)2 series (R=Y, Dy, Gd) and (Y1−xGdx)M2(Y1−xGdx)M2 series (M=Fe, Co). Electrical resistivity for the (Y1−xGdx)(Fe0.7Co0.3)2(Y1−xGdx)(Fe0.7Co0.3)2 intermetallic series was measured in the temperature range 15–1100 K. Parameters characterizing the resistivity dependence on temperature were determined. Residual, phonon and magnetic resistivity were separated from the measured electrical resistivity using both the Matthiesen formula and the Bloch–Gruneisen formula. Curie temperatures of the studied series were determined using both electrical resistivity and Mössbauer effect measurements, with the Mössbauer effect measured in the temperature range around the magnetic ordering temperature. The Curie temperature increases with x . The obtained Curie temperatures for the (Y1−xGdx)(Fe0.7Co0.3)2(Y1−xGdx)(Fe0.7Co0.3)2 are similar to data known for the R(Fe1−xCox)2R(Fe1−xCox)2 series (R=Y, Dy, Gd) and (Y1−xGdx)M2(Y1−xGdx)M2 series (M=Fe, Co).