Abstract
The new metallic ruthenium pyrochlore oxides La2−xCdxRu2O7−δhave been synthesized forx=0.8, 1.0, 1.2, 1.4 and 1.6 at temperatures between 1050 and 1100°C. Magnetization measurements forx=1.0 and 1.6 revealed their strong temperature-dependent paramagnetic behaviors. The bond angle Ru–O–Ru (137.9°) and bond length Ru–O (1.957 Å) determined for La0.4Cd1.6Ru2O7−δare located in the region of other metallic ruthenium pyrochlore oxides. The pyrochlore phase La0.4Cd1.6Ru2O7–δafter prolong annealing at 950°C in air converts into the nearly pure perovskite phase La0.2Cd0.8RuO3. Magnetic measurement indicates that La0.2Cd0.8RuO3is a weak ferromagnet with a Curie temperature of about 37 K.
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