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Effects of Lanthanum on Structural and Magnetic Properties of Sr1−xLa\(_{\frac {2}{3}x}\)Fe12O19 Compounds: Theoretical and Experimental Results

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Abstract

Pre-reacted powders of M-type strontium hexaferrites with chemical composition Sr1−xLa\(_{\frac {2}{3}x}\)Fe12O19 (x = 0.1, 0.2, 0.3 0.5, 0.6) were obtained from the conventional solid state reaction method. The final consolidation of these powders were performed by using the spark plasma sintering (SPS) technique. The influence of the La3+ content on the crystal structure and the magnetic properties of the samples were investigated firstly under the framework of a phenomenological model that predicted the cation substitution/distribution in the Sr and/or Fe sites. The theoretical results indicated that La3+ ion mostly occupies the Sr2+ site. It was also found that as La content increased, a certain amount of Fe2+ ions appear as a consequence of the Fe3+ to Fe2+ reduction. However, the Fe2+ occupied preferably the 12k and 4f1 iron sites. The magnetic properties of the obtained samples were assessed by measurements performed in a vibrating sample magnetometer. Also, X-ray diffraction (XRD) measurements were presented as a complementary characterization. We have found that the magnetic properties of the samples degraded as the La3+ content increased and the increase of the Fe2O3 impurity phase.

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Funding

The authors received financial support from Brazil’s agencies CNPq (Grant nos. 452657/2015-6 and 303329/2016-5), CAPES/MES (Grant no. 157/2012), and the Petrobras company.

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Authors and Affiliations

  1. Departamento de Matemática-Física, Facultad de Ciencias Informáticas, Naturales y Exactas, Universidad de Granma Apdo. 21, P. O. Box 85100, Bayamo, Cuba

    J. Matilla-Arias, E. Govea-Alcaide & F. Rosales-Saiz

  2. Departamento de Física, Universidade Federal do Amazonas, Av. Gen. Rodrigo Octávio Jordão Ramos, 6.200 - Coroado - Setor Norte do Campus Universitário, Manaus-AM, Brazil

    E. Govea-Alcaide

  3. Departmento de Química y Física, Universidad de Holguín, Holguín, Cuba

    P. Mariño-Castellanos

  4. Departamento de Engenharia Mecatrônica e Sistemas Mecânicos, Escola Politécnica, Universidade de São Paulo, São Paulo, SP, 05508-900, Brazil

    I. F. Machado

  5. Departamento de Física de Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, São Paulo, Brazil

    K. Montero-Rey

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  1. J. Matilla-Arias
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  2. E. Govea-Alcaide
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  3. P. Mariño-Castellanos
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  4. F. Rosales-Saiz
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  5. I. F. Machado
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  6. K. Montero-Rey
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Correspondence to E. Govea-Alcaide.

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Matilla-Arias, J., Govea-Alcaide, E., Mariño-Castellanos, P. et al. Effects of Lanthanum on Structural and Magnetic Properties of Sr1−xLa\(_{\frac {2}{3}x}\)Fe12O19 Compounds: Theoretical and Experimental Results. J Supercond Nov Magn 32, 3671–3678 (2019). https://doi.org/10.1007/s10948-019-5119-z

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  • DOI: https://doi.org/10.1007/s10948-019-5119-z

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