Electron paramagnetic resonance, magnetic and electrical properties of CoFe2O4 nanoparticles

Jnaneshwara, D.M.; Avadhani, D.N.; Prasad, B. Daruka; Nagabhushana, B.M.; Nagabhushana, H.; Sharma, Saurabh; Shivakumara, C.; Rao, J.L.; Gopal, N.O.; Ke, Shyue-Chu; Chakradhar, R.P.S.

doi:10.1016/j.jmmm.2013.02.028

Cited by 50 publications

(24 citation statements)

References 28 publications

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“…Furthermore, the findings assign the g value close to 4.3 to the super exchange between Fe 3+ , Co 2+ , and Co 2+ /Co 3+ [17,[32][33][34]. This can be inferred in light of the signals in Figure 5 below the main line.…”

Section: Epr Measurementsmentioning

confidence: 74%

“…In addition, the tetrahedral coordination of iron with strong rhombic distortion or framework form appears at g = 4.3, well corresponding with Fe(III) presence in the structure [17]. Furthermore, the findings assign the g value close to 4.3 to the super exchange between Fe 3+ , Co 2+ , and Co 2+ /Co 3+ [17,[32][33][34]. This can be inferred in light of the signals in Figure 5 below the main line.…”

Section: Epr Measurementsmentioning

confidence: 96%

“…In all of these cases, the electron-free energy values, i.e., g is equal to 2.1. According to the findings, the signal at g = 2.0 can be ascribed to the very likely octahedral coordination or extra-framework form of iron species [17,32]. Thus, the observed shift of 0.1 for the g value can be attributed to the agglomeration of the nanoparticles, resulting in strong dipolar interactions, as for FeCo magnetic compounds [32].…”

Section: Epr Measurementsmentioning

confidence: 99%

“…According to the findings, the signal at g = 2.0 can be ascribed to the very likely octahedral coordination or extra-framework form of iron species [17,32]. Thus, the observed shift of 0.1 for the g value can be attributed to the agglomeration of the nanoparticles, resulting in strong dipolar interactions, as for FeCo magnetic compounds [32]. Evidence for the nature of iron as Fe 2+ /Fe 3+ has been recently reported in our previous findings on detailed EPR studies of Fe-based compounds [17], and this confirms the maghemite presence, as previously observed via Raman and XRD.…”

Section: Epr Measurementsmentioning

confidence: 99%

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Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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Nanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four different methods, the catalyst prepared via the NC and CM procedures enabled a partial incorporation of the Sn into the FeCo matrix forming a very active phase, namely the Heusler alloy. This was ascribed to the high initial dispersion of Sn as a promoter into the FeCo matrix, which led to available FeCoSn (FCS) particles well dispersed and stable on the catalyst surface. In the case of incorporating Mo or Cu to the nanosized FeCo catalyst, a poor stability towards leaching was observed when operating under the same reaction conditions. Cu was much less active than both Sn and Mo, mainly leading to acetophenone, ethylbenzene, 2-phenyl ethanol, 2-phenyl acetic acid, and 2-phenyl acetaldehyde products. The best catalytic results under the optimized reaction conditions, especially at 50 • C and styrene/H 2 O 2 molar ratio of 1 were achieved with nanosized FCS. This solid had a conversion of ca. 70% and selectivity for aldehydes of ca. 27%, and the selectivity for the condensation products was 29%.

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Section: Epr Measurementsmentioning

confidence: 74%

Section: Epr Measurementsmentioning

confidence: 96%

Section: Epr Measurementsmentioning

confidence: 99%

Section: Epr Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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“…In particular, cobalt ferrite nanoparticles have been considered for applications such as gas sensors, microwave devices, magnetic resonance imaging, magnetic fluids, spintronics, solar cells, high density recording media and power transformers [2]. One of the techniques used to study the properties of nanosized magnetic particles is FMR.…”

Section: Introductionmentioning

confidence: 99%