التفاصيل البيبلوغرافية
| العنوان: |
Structural characterization and tuning of magnetic properties of CoVδFe2−δO4 (0.0 ≤ δ ≤ 0.9) nanomaterials synthesized via a modified sol–gel autocombustion method. |
| المؤلفون: |
Patil, Anagha B.1 (AUTHOR), Panda, Rabi N.1 (AUTHOR) rnp@goa.bits-pilani.ac.in |
| المصدر: |
New Journal of Chemistry. 1/7/2025, Vol. 49 Issue 1, p109-123. 15p. |
| مصطلحات موضوعية: |
*FIELD emission electron microscopy, *MAGNETIC traps, *LATTICE constants, *MAGNETIC properties, *RAMAN spectroscopy |
| مستخلص: |
We report magnetic properties of CoVδFe2−δO4 nanomaterials synthesized via a modified sol–gel autocombustion method. Lattice parameters obtained from X-ray diffraction (XRD) studies varied from 8.348 to 8.285 Å for δ = 0.0–0.9. Crystallite sizes estimated using Williamson–Hall (W–H) plots were found to be in the range of 52–30 nm (δ = 0.0–0.9). Lattice strain varied from 1.34 × 10−3 to 2.00 × 10−3 for δ = 0.0–0.9. Fourier transform infrared (FTIR) studies revealed peak positions in the ranges of 589.2–602.9 and 409.3–419.5 cm−1 for tetrahedral (Td) and octahedral (Oh) coordination, respectively. Raman spectra showed peaks corresponding to T2g(3), Eg(2), Eg(1), T2g(2), T2g(1), A1g(2) and A1g(1) modes. Particle sizes obtained from field emission scanning electron microscopy (FESEM) analysis varied from 56 to 34 nm for δ = 0.0–0.9. Values of saturation magnetization (Ms) showed significant variation from 82.5 to 47.3 emu g−1 for δ = 0.0–0.9. Coercivity (Hc) values (at 300 K) decreased from 1180 (δ = 0.0) to 886 Oe (δ = 0.9). The estimated values of Ms and Hc (at 5 K) varied from 74.8 to 48.9 emu g−1 (δ = 0.0 to 0.9) and from 7772 to 7078 Oe (δ = 0.0 to 0.9), respectively. XPS study confirmed the redistribution of Co2+ and Fe3+ ions in Oh and Td sites, agreeing well with the magnetic behaviour. The observed decrease in Hc values were also related to a decrease in anisotropy constant (K1), i.e. from 1.44 × 104 to 1.19 × 104 J m−3 for δ = 0.0–0.9. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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