Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties

Details Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties

2003-10-17

arxiv.org/abs/cond-mat/0310411v1

Physics

Condensed Matter

Materials Science

31 Pages 10 Figures to appear in Chem. Mater

Scientific paper

In this paper we present the results of the synthesis and characterisation of nanocrystalline La1-xNaxMnO3+delta samples. Two synthetic routes were employed: polyacrylamide-based sol-gel and propellant synthesis. Pure, single phase materials were obtained with grain size around 35 nm for the sol-gel samples and around 55 nm for the propellant ones, which moreover present a more broaden grain size distribution. For both series a superparamagnetic behaviour was evidenced by means of magnetisation and EPR measurements with peculiar features ascribable to the different grain sizes and morphology. Preliminary magnetoresistivity measurements show enhanced low-field (< 1 T) magnetoresistance values which suggest an interesting applicative use of these manganites.

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