Abstract
Nanocrystalline samples of the manganites La0.9Ag0.1MnO3, La0.7Ag0.3MnO3, and La0.7Sr0.3MnO3 were synthesized through pyrolysis and isothermally annealed. The atomic, subatomic, and magnetic structures of these manganites were studied using magnetic, x-ray, and neutron diffraction measurements. Increasing the annealing temperature from 600 to 1200°C coarsens the grains from 30–40 to 600–700 nm in size. All the samples studied have rhombohedral structure and are ferromagnets. The Curie temperature decreases for the samples doped by silver and increases for the samples doped by strontium as the anneal temperature is increased. The magnetization of the Mn ions increases with nanoparticle size in all the three systems, which indicates the presence of a size effect.
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Translated from Fizika Tverdogo Tela, Vol. 45, No. 12, 2003, pp. 2222–2226.
Original Russian Text Copyright © 2003 by Teplykh, Bogdanov, Valiev, Pirogov, Dorofeev, Ostroushko, Udilov, Kazantsev, Kar’kin.
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Teplykh, A.E., Bogdanov, S.G., Valiev, É.Z. et al. Size effect in nanocrystalline manganites La1−x A xMnO3 (A=Ag, Sr). Phys. Solid State 45, 2328–2333 (2003). https://doi.org/10.1134/1.1635506
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DOI: https://doi.org/10.1134/1.1635506