Influence of gadolinium doping on structural properties of zinc ferrite spinel

Reference	Presenter	Authors (Institution)	Abstract
08-050	Tayanne Cristina Marques Araújo Pereira	Borges, M.F.(Federal University of Maranhão); Sodré, L.C.(Federal University of Maranhão); Pereira, T.C.(Federal University of Maranhão); Santos, I.S.(Federal University of Maranhão); Silva, F.C.(Federal University of Maranhão); Sinfrônio, F.S.(Federal University of Maranhão);	Due to its dielectric and magnetic properties, spinel-type ferrites are often used in high frequency magnetoelectronic devices. Since these properties are strongly dependent on the crystal arrangement and cation distribution, the insertion of rare earth dopants into the crystal lattices may develop or enhance properties already existing in such materials. Thus, this work aims to evaluate the influence of the gadolinium ions (Gd+3) on the structural properties of ZnFe2O4 obtained by microwave-assisted hydrothermal method. Therefore, all samples were characterised by means of XRPD technique and WDXRF, FTIR and Raman spectroscopies. The WDXRF spectra suggest a strong correlation between theoretical and experimental stoichiometries. XRPD data indicate the formation of cubic single-phase GdZnFe2O4 structures (Fd3 ?m space group) only at 100 - 120 °C. However, in between 130 – 160 oC, GdFe2O4 (P63/m space group) was also crystalized as secondary phase. Two of the four T_1u modes for cubic spinel ferrite were detected in between 600 – 400 cm-1 due to the motion of the oxygen anion in both tetrahedral (MO4) and octahedral (MO6) lattices. Five other characteristic spinel Raman modes were detected to the spinel structure, suggesting a short-range order of the crystal. Thus, it can be inferred that the microwave-assisted hydrothermal method is able to generate Gd-doped zinc ferrites with the reduction of the operating costs and manufacturing time.
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