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Abstract: C@LaCO3OH core-shell microspheres have been synthesized by a hydrothermal method using colloidal carbonaceous spheres (CCSs) as template and its by-products as reactant without any other precipitating agent added in the reaction system. The FT-IR and XRD results indicated the successful formation of the well-crystallized LaCO3OH shell with hexagonal crystal structure on the CCSs’ surface. The morphology and qualitative elemental chemical analysis were characterized by SEM, TEM, and EDS. The effects of co-solvent on the crystallinity of the LaCO3OH shell were also studied. In addition, PL result showed one emission band centered at 421 nm (λ ex = 365 nm) of the C@LaCO3OH microspheres. The UV–visible spectrum was also employed to investigate the optical property of the products. Further, a possible formation mechanism of the core-shell structure was proposed. [ABSTRACT FROM AUTHOR]

Abstract: The manganese oxides La0.7Sr0.3MnO3 with rod shape have been synthesized by a simple solid state ceramic method. The morphology and magnetic properties of La0.7Sr0.3MnO3 have been studied by XRD, SEM, TEM and VSM. The diameters of rod-shaped oxide were ranging from 180nm to1.5μm and the length was averaging 20μm. The ratio of length to diameter could reach more than 35:1. The magnetic results showed that the Curie temperature of rod-shaped La0.7Sr0.3MnO3 is far lower than single crystal. [Copyright &y& Elsevier]