Effect of lattice strain on structural and magnetic properties of Ca substituted barium hexaferrite
| Autor: | Rabichandra Pandey, Sweety Supriya, Rakesh Kumar Singh, Lagen Kumar Pradhan, Sunil Kumar, Manoranjan Kar |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Diffraction Materials science Rietveld refinement Magnetism Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetocrystalline anisotropy 01 natural sciences Electronic Optical and Magnetic Materials symbols.namesake Lattice (order) 0103 physical sciences symbols Particle size Crystallite 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 458:30-38 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2018.02.093 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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