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Indian Institute of Technology (IIT) Patna 
R. Kumar, M. Kar  
Corresponding Authors:
Manoranjan Kar 
DOI #: 
Correlation between lattice strain and magnetic behavior in non-magnetic Ca substituted nano-crystalline Cobalt Ferrite 
Ceramics international  
keywords Spinel ferrite, Magnetocrystalline anisotropy, Rietveld, Arrott plot 
Magnetic nanoparticles of calcium (Ca)-substituted cobalt ferrite i.e. Co1xCaxFe2O4(x¼0.00, 0.01, 0.015, 0.02, 0.05, 0.1, and 0.15) havebeen synthesized by the citric acid modified sol–gel method. X-ray powder diffraction (XRD)patterns confirm the formation of spinel phase. Theparticle size decreases with the Ca concentration. The Rietveld refinement of XRD patterns using the space group –Fd̅3mshows monotonicallyincreasing of lattice parameter with the increasing concentration of Ca. The FT-IR spectrum recorded in the range of 325–1000 cm1and Ramanspectrum obtained in the range of 88–800 cm1shows the formation of spinel phase belonging to Fd̅3mspace group supporting structuralanalysis from XRD patterns. Magnetocrystalline anisotropy has been obtained using “Law of Approach (LA) to Saturation magnetization”.Saturation magnetization and remnant magnetization is maximum for 1% Ca substitution which could be due to strain mediated magnetism.However these magnetic properties decrease with the Ca substitution for the percentage above 1%. It could be due to decrease of magneticexchange interaction in the sample. A correlation between magnetic behavior and lattice strain has been established in non-magnetic Casubstituted nano-crystalline cobalt ferrite. In order to investigate the ferromagnetic nature of the sample, Arrott plot analysis has been carried out.Difference in saturation magnetization obtained from LA to saturation and Arrott plot analysis gives the qualitative information about theinfluence of lattice strain on saturation magnetization 
Entered by:
Venkata Dantham on 2020-08-02 
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