Abstract
The Y3-xGdxFe5-yMnyO12 (x = y = 0.0, 0.2, 0.4, 0.6, 1.0, and 1.5) powders were synthesized by a co-precipitation method. The structural analysis confirmed the presence of the cubic structure of YIG, the formation of the secondary phase YFeO3 and the stoichiometry proposed for Y3-xGdxFe5-yMnyO12. The results of the FTIR spectroscopy show three prominent absorption bands that shift to lower wavenumber values with the increase of co-dopant concentrations. Energy bandgap values are found to be 2.96 eV for pure YIG and 3.02 ± 0.1 eV for doped powders. Photoluminescence spectra show that all the samples exhibit intense peaks around 530 nm. Moreover, Gd3+ and Mn2+ partial alternatives strongly influence the magnetic behavior of YIG nanoparticles. It is observed that coercivity is affected by the crystallite size of 0.0 ≤ x = y ≤ 0.6, confirming the multidomain nature of the powders, which could be acceptable in microwave applications and data storage uses.
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