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Influence of Calcium Substitution on Structural, Vibrational and Paramagnetic Properties of Magnesium Ferrite


Affiliations
1 GGHSS, Mubarak Mandi, Panjtirthi, Jammu, Jammu & Kashmir-180 001, India
2 Govt. Degree College, R.S. Pura, Jammu & Kashmir-181 102, India
3 G. G. M. Science College, Canal Road, Jammu-Tawi, Jammu & Kashmir-180 001, India
4 Govt. Degree College, Khour, Akhnoor, Jammu & Kashmir-181 203, India
5 CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-110 012, India
 

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 ν Fe3+ -O stretching vibrational peaks arising from tetrahedral (ν 1 ) and octahedral (ν 2 ) sites in IR transmittance spectra are composition and cation distribution sensitive. The presence of Ca2+ /Mg2+ /Fe2+ ions is evidenced by the splitting of bands and shoulder peaks in IR transmittance spectra. The strong dipolar -dipolar interactions encourage broad asymmetric EPR derivative signal of Fe3+ ions. The substitution of diamagnetic Ca2+ dopant ions in lattice strengthens dipolar-dipolar interactions, broadens the resonance signal and higher g-values due to spin disorder (spin frustration).
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  • Influence of Calcium Substitution on Structural, Vibrational and Paramagnetic Properties of Magnesium Ferrite

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Authors

Gurbinder Kour
GGHSS, Mubarak Mandi, Panjtirthi, Jammu, Jammu & Kashmir-180 001, India
Balwinder Kaur
Govt. Degree College, R.S. Pura, Jammu & Kashmir-181 102, India
Ajay Singh
G. G. M. Science College, Canal Road, Jammu-Tawi, Jammu & Kashmir-180 001, India
Anju Kumari
Govt. Degree College, Khour, Akhnoor, Jammu & Kashmir-181 203, India
Manju Arora
CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-110 012, India

Abstract


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 ν Fe3+ -O stretching vibrational peaks arising from tetrahedral (ν 1 ) and octahedral (ν 2 ) sites in IR transmittance spectra are composition and cation distribution sensitive. The presence of Ca2+ /Mg2+ /Fe2+ ions is evidenced by the splitting of bands and shoulder peaks in IR transmittance spectra. The strong dipolar -dipolar interactions encourage broad asymmetric EPR derivative signal of Fe3+ ions. The substitution of diamagnetic Ca2+ dopant ions in lattice strengthens dipolar-dipolar interactions, broadens the resonance signal and higher g-values due to spin disorder (spin frustration).