Influence of Calcium Substitution on Structural, Vibrational and Paramagnetic Properties of Magnesium Ferrite
The environment friendly calcium substituted magnesium ferrite with composition MgCaxFe2-xO4 (x = 0.00, 0.01, 0.03, 0.05, 0.07) synthesized by the conventional solid – state reaction powdered samples are studied for structural, vibrational and spin characteristics for chemical sensor application. XRD patterns with Rietveld refinement reveal partial inverse spinel structure of the prepared samples with tentative cation occupancy. The rietveld refinement is performed to know the cation occupancy in the prepared samples which could be further helpful to exploit these ferrite materials for different technological applications. The intensity of Fe3+-O stretching vibrational peaks arising from tetrahedral (1) and octahedral(2) sites in IR transmittance spectra are composition and cation distribution sensitive. The presence of Ca2+/Mg2+/Fe2+ ionsis evidenced by the splitting of bands and shoulder peaks in IR transmittance spectra. The strong dipolar-dipolar interactionsencourage broad asymmetric EPR derivative signal of Fe3+ ions. The substitution of diamagnetic Ca2+ dopant ions in latticestrengthens dipolar-dipolar interactions, broadens the resonance signal and higher g-values due to spin disorder (spinfrustration).
Solid state reaction; Crystal structure; X - ray diffraction; Electron paramagnetic resonance
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