Synthesis and Characterization of Ruthenium Pyrochlore Oxides La2−xCdxRu2O7−δ

• Published in: Journal of solid state chemistry Vol. 129; no. 2; pp. 308 - 311
• Main Authors: Zhu, W.J, Ting, S.T, Hor, P.H
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.03.1997; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics; Saturation moments and magnetic susceptibilities; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides; Cadmium oxides; Temperature dependence; Lanthanum oxides; Inorganic compounds; Magnetization; Transition element compounds; Paramagnetism; Ruthenium oxides; Perovskites; XRD; Rare earth compounds; Experimental study; Pyrochlore type compound; Nonstoichiometry; Magnetic susceptibility; Solid solutions; Weak ferromagnetism; Chemical preparation; Chemical composition; Quaternary compounds; Electric conductivity; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1996.7257

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.