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Tuning of Curie Temperature and Magnetocaloric Effect via Annealing Condition Change in La 0.8 K 0.2MnO 3 Manganites

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Abstract

In this paper, we report on the structural, magnetic and magnetocaloric properties of La 0.8 K 0.2MnO 3 manganites annealed at different temperatures in the form of powder. The analyses of X-ray diffraction patterns indicate that the crystallographic structure is unchanged when the annealing temperature increases from 800 to 1200 ∘C. The annealing conditions have obvious influences on the Curie temperature and isothermal entropy change. With an applied field change of 5 T, the maximum values of isothermal entropy changes are found to be 3.7 J/kg K at 283 K, 3.4 J/kg K at 298 K, 4.0 J/kg K at 308 K, 4.3 J/kg K at 318 K, and 4.6 J/kg K at 293 K for T a= 800, 900, 1000, 1100, and 1200 ∘C, respectively. The results imply that the change of annealing conditions is an applicable way for optimizing the Curie temperature and magnetocaloric effect for such potassium-doped manganites.

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Acknowledgments

The present work was supported by the Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region (No. NJZZ14159), the Natural Science Foundation of Inner Mongolia (No. 2013MS0111), the Talent Project of Inner Mongolia (3400102), and the Rare-earth Key Program of Baotou (2012R1006).

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Authors and Affiliations

  1. School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, 014010, Baotou, China

    Z. R. Zhao, X. Wang & X. F. Zhang

  2. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, 014010, Baotou, China

    G. F. Wang & X. F. Zhang

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  1. Z. R. Zhao
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  2. X. Wang
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  3. G. F. Wang
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  4. X. F. Zhang
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Correspondence to G. F. Wang.

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Zhao, Z.R., Wang, X., Wang, G.F. et al. Tuning of Curie Temperature and Magnetocaloric Effect via Annealing Condition Change in La 0.8 K 0.2MnO 3 Manganites. J Supercond Nov Magn 28, 3693–3700 (2015). https://doi.org/10.1007/s10948-015-3210-7

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  • DOI: https://doi.org/10.1007/s10948-015-3210-7

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