Rietveld refined structural, morphological, Raman and magnetic investigations of superparamagnetic Zn–Co nanospinel ferrites prepared by cost-effective co-precipitation route

Unraveling the Complex Interplay of Phase Transitions in Spinel Ferrites: A Comprehensive Quantum Mechanical Vibrational Study of ZnFe2O4

“…The fourth peak at 367 cm –1 (E g ) has a moderate intensity of about 53% of the highest peak, and the final peak is weak, appearing at a lower wavenumber (189 cm –1 ) (T 2g (1)). However, a review of the literature reveals that the peak at 602 cm –1 not reported experimentally in ref ( 13 ), and assigned to A 1g symmetry in ref ( 39 ), leads to misleading assignments for the obtained Raman modes, as shown in Table 4 . Among the various studies reviewed in ref ( 66 ), our assignment aligns only with the reported in ref ( 81 ).…”

“…They assigned all three peaks at the highest frequencies (674.47, 634.8, and 598.47 cm –1 ) for Mn 0.8 Zn 0.2 Fe 2 O 4 to A 1g symmetry. Andhare et al identified six modes related to three synthesized samples Co 1– x Zn x Fe 2 O 4 ( X = 0.0, 0,5 and 1.0), and assigned the additional band appears at 604.5 cm –1 for ZnFe 2 O 4 to A 1g (2) symmetry, distinguishing it from the other A 1g (1) at 681 cm –1 . , The assignments presented by Yadav et al for ZnFe 2 O 4 attributed the two bands at 605 and 653 cm –1 to A 1g symmetry, observing an increase in their intensities with the annealing temperature. Interestingly, this band around 600 cm –1 was not observed by Wang et al The spectra of Ni 0.5 Zn 0.5 Fe 2 O 4 mixed spinel obtained by mechanochemical synthesis compared with that of ZnFe 2 O 4 and NiFe 2 O 4 by Lazarević et al showed clear distortions from normal cubic spinel by exhibiting more than the expected five modes of cubic spinel .…”

“… 6 They assigned all three peaks at the highest frequencies (674.47, 634.8, and 598.47 cm –1 ) for Mn 0.8 Zn 0.2 Fe 2 O 4 to A 1g symmetry. Andhare et al 39 identified six modes related to three synthesized samples Co 1– x Zn x Fe 2 O 4 ( X = 0.0, 0,5 and 1.0), and assigned the additional band appears at 604.5 cm –1 for ZnFe 2 O 4 to A 1g (2) symmetry, distinguishing it from the other A 1g (1) at 681 cm –1 . 11 , 7 The assignments presented by Yadav et al 34 for ZnFe 2 O 4 attributed the two bands at 605 and 653 cm –1 to A 1g symmetry, observing an increase in their intensities with the annealing temperature.…”

Evaluation of synergistic approach of spinel cadmium–copper nanoferrites as magnetic catalysts for promoting wastewater decontamination: Impact of Ag ions doping

“…Raman peak frequencies over 600 cm −1 indicate the tetrahedral site, while those below 600 cm −1 indicate the octahedral site in the case of spinel ferrite (Andhare et al 2021 ). However, the five Raman modes could be attributed to the migration of O 2 − anions and cations at tetrahedral and octahedral sites in spinel ferrites.…”

Evaluation of synergistic approach of spinel cadmium–copper nanoferrites as magnetic catalysts for promoting wastewater decontamination: Impact of Ag ions doping

“…The three T2g modes-T2g(1), the lowest frequency mode, T2g(2), and T2g(3), the highest frequency modes of this vibrational species-are designated.The development of the A1g, Eg, and 3T2g Raman active peaks was predicted to occur from the production of the cubic phase, which is clearly seen in the spectra of all prepared samples. Raman peak frequencies over 600 cm -1 indicate the tetrahedral site, while those below 600 cm -1 indicate the octahedral site in the case of spinel ferrite(Andhare et al 2021). These five Raman modes are connected to the migration of O2-anions and cations at tetrahedral and octahedral sites in spinel ferrites.…”