Abstract
This research reports an investigation on the effect of Ag+ substitution in MgFe2O4 nanomaterials. The Ag+-substituted MgFe2O4 nanomaterials were successfully prepared by a citrate precursor method at 550 °C for 2 h. The TG–DTA confirmed the annealing temperature beyond 400 °C to get crystalline phase. The XRD analysis revealed the formation of pure crystalline phase of MgFe2O4 with cubic spinel structure (Fd-3 m space group) along with the metallic peaks of Ag+. The crystallite size of the entire MgAgxFe2-xO4 samples (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) was found between 10 and 22 nm using Scherer’s equation, which decreased with increase in Ag+ content. To achieve refined diffraction parameters, Rietveld refinement was executed for entire samples. The lattice strain (ε) was also calculated using W–H plot for all samples, which ranged from − 2.11 × 10−3 to 5.98 × 10−3. The SEM micrographs have shown porous structures in the prepared samples, which decreased with the increase in Ag+ content. The existence of metal oxide bonds between 423 and 571 cm−1 points towards spinel phase of MgFe2O4 by FTIR. The increase in Ag+ content has resulted in the increase of the direct and indirect band gaps of prepared materials. The average particle size was approximately measured to be 19.23 nm and 12.76 nm for MgFe2O4 and MgAgFeO4, respectively, by HRTEM. Magnetic measurements revealed that the coercivity (Hc) decreased, but saturation magnetization (Ms) and retentivity (Mr) increased with the increase in Ag+ content. The material thus prepared may exhibit excellent properties for its applications in antimicrobial activity, biomedicine and electronics industry.
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The authors sincerely acknowledge the Dept. of Education, Govt. of Bihar, for opening the Center for Nanoscience and Nanotechnology at Aryabhatta Knowledge University in Patna, where this research was carried out successfully.
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Shankar, U., Singh, R.K., Das, S.B. et al. Studies on the Structural Properties and Band Gap Engineering of Ag+-Modified MgFe2O4 Nanomaterials Prepared by Low-Cost Sol–Gel Method for Multifunctional Application. J Supercond Nov Magn 35, 1937–1960 (2022). https://doi.org/10.1007/s10948-022-06220-w
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DOI: https://doi.org/10.1007/s10948-022-06220-w