Crystal structure and electrical resistivity studies of Dy(Fe0.7−xNixCo0.3)2 intermetallics

Findings from X-ray powder diffraction measurements (295 K) show that the cubic, MgCu2-type, Fd3m crystal structure appears in Dy(Fe0.7−xNixCo0.3)2 compounds.The lattice parameter is considerably reduced with x. Electrical resistivity for the Dy(Fe0.7−xNixCo0.3)2 intermetallic series was measured in a wide temperature range and the parameters characterising the dependence of resistivity on temperature and composition were determined. The magnetic part of the resistivity was used to estimate Curie temperatures. The Curie temperature TC is strongly reduced as a result of Fe/Ni substitution. The obtained TC-results are related to the data known for the Dy(Mn1−xFex)2 and Dy(Fe1−xCox)2 series.