| Autor: |
Gopale, Sanjay B., Khedkar, Mangesh V., Jadhav, Swapnil A., Raut, Anil V., Karad, Sunil S., Kulkarni, Govind D., Jadhav, K. M. |
| Předmět: |
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| Zdroj: |
Journal of Materials Science: Materials in Electronics; Dec2022, Vol. 33 Issue 35, p26544-26563, 20p |
| Abstrakt: |
In the present work, Al3+-Gd3+ substituted (at iron site) cubic nickel ferrite nanoparticles having the formula NiFe2-2xAlxGdxO4 (x = 0.00–0.08 in the step of 0.02) were fabricated through wet chemical, low temperature sol–gel self-ignition method. Glycine (C2H5NO2) was used as a fuel; maintaining the metal nitrite to glycine ratio as 1:4.4. The as prepared nanoparticles were annealed at 850 ºC for 5 h for removal of the moisture and other impurities. The phase purity and the structural parameters were investigated using the powder X-ray diffraction technique, which indicates the presence of principle reflections (220) and (311) along with other reflections belonging to cubic structure which proves that the prepared samples possesses mono-phase and the crystal structure have cubic spinel symmetry. The ferrite phase formation was assured with the characteristic peaks driven by intrinsic υ1 = 546 cm−1, 557 cm−1, and extrinsic vibration υ2 = 401 cm−1, 417 cm−1 studied in the FTIR spectroscopic analysis. The lattice constant (a) of NiFe2-2xAlxGdxO4 NPs was found to be increased gradually with an increasing composition of Al-Gd co-substitution under the influence of higher ionic radii. The average crystallite size (D) was estimated through Scherrer's formula varies between 20.88 and 27.82 nm. The SEM and TEM observations of typical samples have suggested the well-defined spherical grain growth with dense structure and agglomeration with a particle size of ~ 28.56 nm to ~ 47.74 nm. From the Brunauer–Emmett–Teller analysis, the surface area of the samples with x = 0.02 and 0.04, was found to be in the range of 10.6–18 m2/g. The magnetic properties such as saturation magnetization (Ms) and magneton number (nB) were decreased with an increasing Al-Gd content X. The remanence ratio (Mr/Ms) was found to be in the range of 0.25 to 0.37, indicating the multi-domain structure of the prepared samples. The Ultraviolet–Visible spectroscopy was employed to study the absorbance and determine the bandgap of the NiFe2-2xAlxGdxO4 NPs which is of the order ~ 2.80 eV. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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