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Abstract
Nanocrystallites of nominal composition(La0.5Sr0.5)TiO3 12–15 nm in diameter exhibit a diamagnetic susceptibility that is greater by afactor of three than that of bulk ceramic material, due to a much-reduced Pauliparamagnetic contribution associated with oxidation (cation deficiency) of thematerial. Doping the nanocrystallites with 1.5 or 2.0% of every transition metalfrom V–Ni adds a Curie term to the susceptibility. Exchange coupling betweenthese paramagnetic ions is very weak. In the cases of Fe, Co and Ni there is anadditional hysteretic ferromagnetic magnetization, with a moment equivalentto a few tenths of a Bohr magneton per dopant atom, which is attributed to asecondary ferromagnetic impurity phase. Mössbauer analysis of samples prepared with 57Fe reveals the presence of some metallic iron. Metallic nickel is detected by x-ray diffraction,but no direct evidence of metallic cobalt was found in the ferromagnetic Co-dopedmaterial. The possibility of high temperature defect-related ferromagnetism in a metallicoxide is discussed.
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