Abstract
Abstract A cubic-tetragonal phase transformation of EuC2 was observed at 623 K. The phase transition temperatures of metal dicarbides (MC2) were discussed in terms of the band structure proposed by previous authors. The compound EuC2 was a ferromagnet with a zero field curie temperature of 20 K, which was close to the value expected from the Curie temperature vs. nearest neighbor Eu–Eu distance relation for the Eu chalcogenides. The solid solutions, LaxEu1−xC2, became ferromagnetic at low temperatures over the whole composition range, while the solid solutions, GdxEu1−xC2, have continuously changed the kind of magnetic order from ferromagnetic to antiferromagnetic. All the effective moments obtained for RxEu1−xC2 were in good agreement with the theoretical values of Eu2+ and R3+ contained. The electrical resistivities of EuC2 and its solid solutions had a sharp peak near the Curie temperature. When magnetic field was applied, the peak became broader and shifted to higher temperature.
Published Version
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