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Synthesis of Different-Sized La0.7Sr0.3MnO3 Nanoparticles via a Polyacrylamide Gel Route and Their Magnetocaloric Properties

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Abstract

In this work, a polyacrylamide gel route was used to synthesize La0.7Sr0.3MnO3 nanoparticles. It is shown that single-phase La0.7Sr0.3MnO3 nanoparticles with a rhombohedral perovskite structure can be prepared at a calcination temperature of 600 °C when separately using citric acid, tartaric acid, acetic acid, oxalic acid, and EDTA as the chelating agent. The particles prepared using the five chelating agents are nearly spherical in shape with a narrow diameter distribution, and have an average size of 24, 28, 36, 38, and 50 nm, respectively. Magnetic properties of the 24 and 50 nm samples (termed as samples S1 and S5, respectively) were investigated. It is revealed that the samples have a similar ferromagnetic Curie temperature T C , and exhibit a typical second-order magnetic phase transition near T C . The maximum magnetic entropy change at an applied magnetic field of 15 kOe is obtained to be about 0.71 and 0.74 J kg−1 K−1 for the 24 and 50 nm samples, respectively.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 50962009 and 51262018) and the Hongliu Outstanding Talents Foundation of Lanzhou University of Technology (Grant No. J201205).

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Authors and Affiliations

  1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Y. F. Wang & H. Yang

  2. School of Science, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Y. F. Wang & H. Yang

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  1. Y. F. Wang
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  2. H. Yang
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Correspondence to H. Yang.

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Wang, Y.F., Yang, H. Synthesis of Different-Sized La0.7Sr0.3MnO3 Nanoparticles via a Polyacrylamide Gel Route and Their Magnetocaloric Properties. J Supercond Nov Magn 26, 3463–3467 (2013). https://doi.org/10.1007/s10948-013-2190-8

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  • DOI: https://doi.org/10.1007/s10948-013-2190-8

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