Sol-gel synthesized CoFe2-xGdxO4:SiO2 nanocomposites for structural, thermal and magnetic investigation
Silica embedded cobalt ferrite CoFe2-xGdxO4:SiO2 nanocomposites (x = 0.00, 0.025, 0.050, 0.075, 0.1) were synthesized successfully by sol-gel method. These fine powder form samples were further heat treated at temperature 750 °C and 1000 °C in muffle furnace for 2 h. A steady increase in lattice par...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-01-01
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| Series: | Next Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S294982282400368X |
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| Summary: | Silica embedded cobalt ferrite CoFe2-xGdxO4:SiO2 nanocomposites (x = 0.00, 0.025, 0.050, 0.075, 0.1) were synthesized successfully by sol-gel method. These fine powder form samples were further heat treated at temperature 750 °C and 1000 °C in muffle furnace for 2 h. A steady increase in lattice parameter and strain is observed in the range 8.375–8.489 Å and 0.00153–0.008 respectively with raising Gd3+ ion content from 0.00 to 0.10 in samples annealed at 1000 °C. Appearance of bands in FTIR spectra at 860.09 cm−1, 586.57 cm−1 and an array of 559–580 cm−1 are contributed by Si–O–Fe vibrations and absorption bands of Gd3+ respectively. Further, TEM results demonstrate better uniformity, smaller size and much narrower distribution of particles at higher concentration of Gd3+ ions and annealing temperature. No weight loss was observed beyond 750 °C observed by TGA analysis confirmed about full decomposition of precursors and formation of stable structures of CoFe1.95Gd0.050O4:SiO2 and CoFe1.9 Gd0.1O4: SiO2. Appreciable variations in important parameters like saturation magnetization (Ms), residual magnetization (Mr), coercivity (Hc) and anisotropy constant (K) by the Gd3+ ions doping concentration in silica embedded CFO nanocomposites are determined. The drop in Ms could be due to surface dipoles disorderness induced microstrain by doping with larger Gd3+ radii (0.94 Å) than Fe3+ions (0.67 Å). It may also be understood due to reducing effect on inter-sub lattice exchange energy between Co-O-Gd and Co-O-Fe with respect to Fe-O-Fe interactions in our prepared samples. These tailor-made magnetic materials are promising for memory device, gas sensing, magnetic drug delivery, spintronics and DNA separation properties. |
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| ISSN: | 2949-8228 |