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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
S. Kumar, S. Supriya, L. K. Pradhan, R. Kumar and M. Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:
Doi https://doi.org/10.1016/j.jmmm.2018.02.093 
Title:
Effect of lattice strain on structural and magnetic properties of Ca substituted barium hexaferrite 
Journal:
Journal of Magnetism and Magnetic Materials 
Year:
2018 
Volume:
458 
Page:
30 
Keywords:
XRD, Raman spectroscopy, Lattice strain, LA to saturation, Magnetocrystalline anisotropy 
Abstract:
The calcium (Ca2+) substituted M-type barium hexaferrite (Ba1-xCaxFe12O19) for Ca2+ (x = 0.00, 0.025, 0.050, 0.075, 0.100, 0.150, and 0.200) have been synthesized by the citrate sol-gel method. The X-ray diffraction (XRD) patterns with Rietveld refinement reveal the formation of hexagonal crystal structure with P63/mmc space group. The lattice parameters a=b and c decrease, whereas lattice strain found to increase with the increase in Ca concentration in the samples. The analysis of Raman spectra well supports the XRD patterns analysis. The average particle size is obtained from the FE-SEM (Field Emission Scanning Electron Microscopy) micrographs and these are similar to that of crystallite size obtained from the XRD pattern analysis. The saturation magnetization and magnetocrystalline anisotropy have been obtained by employing the ‘‘Law of Approach (LA) to Saturation magnetization” technique at room temperature. The saturation magnetization and magnetocrystalline anisotropy constant are maximum for 5% Ca substitution in barium hexaferrite. It could be due to lattice strain mediated magnetism. However, these magnetic properties decrease for more than the 5% Ca substitution in barium hexaferrite. It could be due to decrease of magnetic exchange interaction (Fe-O-Fe) in the sample. A correlation between magnetic interaction and lattice strain has been observed in Ca2+ substituted M-type barium hexaferrite. 
Entered by:
Venkata Dantham on 2020-08-02 
 
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