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Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites.
- Source :
- Hyperfine Interactions; Dec2022, Vol. 244 Issue 1, p1-15, 15p
- Publication Year :
- 2022
-
Abstract
- We report on the synthesis of spinel Co<subscript>1-x</subscript>Zn<subscript>x</subscript>Fe<subscript>2</subscript>O<subscript>4</subscript> (x=0.0-0.56) ferrites by sol-gel auto-combustion method. X-ray diffraction 'XRD', magnetic measurements were used to study compositional-dependence of structural, magnetic properties, connection among them. Mössbauer spectroscopy was used to identify non-magnetic-phase, its effect on magnetic properties. Single-phased nano spinel-ferrite formation is confirmed by XRD. Increasing Zn-content leads to structural modifications such as decrease of lattice parameter, grain diameter D<subscript>W-H</subscript>, alteration of inversion parameter, disorder, tensile-strain, dislocation density, variation of A–O–B, A–O–A, B–O–B super-exchange-interaction and canting angles. Cationic distribution suggests that Fe<superscript>3+</superscript>,Co<superscript>2+</superscript> ions reside on both A, B-sites, and with increasing Zn-content, B-site population of Fe<superscript>3+</superscript>, Zn<superscript>2+</superscript> ions increases; while that of Co<superscript>2+</superscript> ions decreases. Saturation magnetization shows noticeable dependence on canting angle suggests that the magnetization in the studied samples is described by Yafet-Kittel three-sub-lattice model. Coercivity H<subscript>c</subscript> values are consistent with anisotropy, and its dependence on D<subscript>W-H</subscript> suggests that the studied samples are inoverlap-region between multiple-domains/single-domain. Reduced-remanence indicate the variation of inter-grain magnetostatic-interaction, isotropic-behavior of multi-domain particles. Observed broad peaks in magnetization derivative with field suggest large-number of dislocations, more-uniform particle-size. Switching-field-distribution proposes potential application of the studied x=0.0 sample in high density recording, and sample with x=0.56 in targeted drug delivery. Mössbauer measurements confirm three-magnetic-components corresponding to A,B-sites, Fe3+ ions in grain boundaries/surface, Fe has 3+ oxidation state, and growing paramagnetic-doublet, alone does not explain the trend of M<subscript>s</subscript>, suggesting that it is a collective-effect of structural-modification, presence of paramagnetic-doublet. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043843
- Volume :
- 244
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Hyperfine Interactions
- Publication Type :
- Academic Journal
- Accession number :
- 163486860
- Full Text :
- https://doi.org/10.1007/s10751-022-01814-1