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Crystal Structure and Magnetic Properties of (Co-Ag) co-doped SnO2 Compounds

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Abstract

Pure SnO2, Sn0.94Co0.06O2, Sn0.91Co0.06Ag0.03O2, and Sn0.88Co0.06Ag0.06O2 compounds were synthesized by the solid-state reaction method. The structural characterization of these compounds by recording X-ray diffraction patterns (XRD) and analyzing them using Rietveld refinement analysis shows that these materials are in single-phase tetragonal rutile structure with typical lattice constant of a = b = 4.7385 Å and c = 3.1871 Å for SnO2 compound. SEM images show the formation of homogenous nanometer range spherical particles. Temperature variation of magnetization (M-T) measurements show a typical diamagnetic behavior in parent compound, while ferromagnetic (FM) to paramagnetic transition is observed in Sn0.94Co0.06O2 compound with a Curie temperature of 232.5 K. The (Co-Ag) co-doped SnO2 compounds undergo double ferromagnetic transitions. These compounds exhibit first FM transition below 620 K and another FM transition at 1108 K and 1052 K, respectively for Sn0.91Co0.06Ag0.03O2 and Sn0.88Co0.06Ag0.06O2 compounds. The measurement of magnetic hysteresis (M-H) curves at room temperature indicates the increase in coercivity and saturation magnetization values with the increase of (Co-Ag) co-doping concentration. The observed ferromagnetism was discussed based on the exchange interaction between Co2+ and Co3+ ions via oxygen vacancies.

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Authors and Affiliations

  1. Department of Physics, Central Institute of Technology Kokrajhar, Kokrajhar, 783370, India

    S. K. Srivastava

  2. Department of Physics, Indian Institute of Technology Guwahati, Guwahati, 781039, India

    Aakansha & S. Ravi

  3. Department of Physics, Bodoland University, Kokrajhar, 783370, India

    S. S. Baro, B. Narzary, D. R. Basumatary & R. Brahma

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  1. S. K. Srivastava
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  2. Aakansha
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Srivastava, S.K., Aakansha, Baro, S.S. et al. Crystal Structure and Magnetic Properties of (Co-Ag) co-doped SnO2 Compounds. J Supercond Nov Magn 34, 461–467 (2021). https://doi.org/10.1007/s10948-020-05676-y

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  • DOI: https://doi.org/10.1007/s10948-020-05676-y

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