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Magnetocaloric response of submicron (LaAg)MnO3 manganite obtained by Pechini method

  • Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications
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Abstract

Lanthanum-based manganites containing monovalent silver cations and having grain sizes below 0.30 microns were synthesized via Pechini method, by using a moderate calcination temperature (900 °C). The incorporation of Ag+ ions into the perovskite crystal structure was verified by means of EDS, EELS, and XPS techniques. Monovalent cations provoked a rhombohedral deformation of the crystal structure, together with the formation of Mn3+–Mn4+ pairs yielding to a noticeable ferromagnetic behavior characterized by high saturation magnetization (47 Am2/kg) and a steep Curie transition at 308 K. This combination of magnetic properties enable an excellent magnetocaloric performance, with magnetic entropy variations of up to 5.6 J/kg K (for magnetic field ΔH = 5.0 T) and refrigerant capacities of up to 184 J/kg.

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Acknowledgments

I. Betancourt acknowledges financial support from PASPA-UNAM, Mexico, and CONACYT Mexico, for his sabbatical leave. Electron transmission microscopy work at UTSA was supported by the NIH RCMI Nanotechnology and Human Health Core (G12MD007591). Support received from Laboratorio Nacional de Investigaciones en Nanociencias y Nanotecnología (LINAN, IPICYT) is kindly acknowledged. The valuable technical assistance by L. Huerta-Arcos, from IIM-UNAM, Mexico, is also recognized.

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Authors and Affiliations

  1. Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510, México, D.F., Mexico

    M. E. Amano

  2. Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA

    I. Betancourt & M. J. Arellano-Jimenez

  3. Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4ª, 78216, San Luis Potosí, S.L.P., Mexico

    J. L. Sánchez-Llamazares & C. F. Sánchez-Valdés

Authors
  1. M. E. Amano
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  2. I. Betancourt
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  3. M. J. Arellano-Jimenez
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  4. J. L. Sánchez-Llamazares
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  5. C. F. Sánchez-Valdés
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Correspondence to I. Betancourt.

Additional information

I. Betancourt is at sabbatical leave from Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F. 04510, México.

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Amano, M.E., Betancourt, I., Arellano-Jimenez, M.J. et al. Magnetocaloric response of submicron (LaAg)MnO3 manganite obtained by Pechini method. J Sol-Gel Sci Technol 78, 159–165 (2016). https://doi.org/10.1007/s10971-015-3911-1

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  • DOI: https://doi.org/10.1007/s10971-015-3911-1

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