Abstract
We made use of neutron diffraction to study the crystal structure of R(Co1−xCux)5, in which x = 0.0, 0.2, 0.4, and 0.6, R = Y and Ce. From the analysis of neutron diffraction spectra, we found the Cu atoms prefer to occupy the 2c site. Meanwhile, we studied the thermal expansion behavior of CeCo5 and Ce(CoCu)5 compounds by high temperature x-ray. It showed an invar-type thermal expansion anomaly in the axis c below the Curie temperature. The anomalies are considerably reduced on the partial substitution of the Co atoms by the Cu atoms. All of these characteristics can be explained with the order of the substitution of Co atoms by Cu atoms.
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