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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 624Effect of Sr-Doping Concentration on Structure and...

Effect of Sr-Doping Concentration on Structure and Phase-Separation between Ferromagnetic and Paramagnetic Phases in Lanthanum Manganite Oxide

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Abstract:

The perovskite La_1-xSr_xMnO₃ (LSMO) nanocrystalline compounds with the doping concentration x in the range of 0.2~0.5 have been synthesized by combustion method using the pair of citric acid and ethylene glycol as a burning fuel. It was found that the sintering temperatures at which the compounds began forming the single-phase of LSMO increased from 900 °C up to 1200 °C corresponding to the increasing of Sr-doping content. X-ray pattern investigations presented the crystalline sizes of all samples sintered at 1200 °C evidently reduced from 77.7 nm to 18.9 nm as the doping concentration x increases. The effects of Sr-doping levels on Mn⁴⁺/Mn³⁺ ratio as well as on their electrical resistivity are also studied by X-ray photoelectron spectroscopy and four-point probes method, respectively. By using a resistive approximation model, the role of the Sr-doping with respect to the phase-separation between ferromagnetic and paramagnetic phases with respect to colossal magnetoresistance effect of these compounds is discussed.

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Chinese Ceramics Communications III

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Periodical:

Advanced Materials Research (Volume 624)

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127-133

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https://doi.org/10.4028/www.scientific.net/AMR.624.127

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Online since:

December 2012

Authors:

Le Van Khoa Bao, Guang Ze Tang, Xin Xin Ma

Keywords:

Combustion Method, Lanthanum Manganite Oxide, Resistivity

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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