Magnetic properties and environment sites in Fe doped SnO 2 nanoparticles

Effect of the dopant on the structural and hyperfine parameters of Sn0.95M0.05O2 nanoparticles (M: V, Mn, Fe, Co)

“…So far, we do not find any chemical argument to a favour of the formation of Fe 2+ during the synthesis by co-precipitation method. On the other hand, in our experiments published previously [11], in 10 and 15 at% Fe-doped SnO 2 nanoparticles, only Fe 3+ species were detected. This last fact reinforces very strongly our initial guess on Fe 3+ oxidation state in our sample with 5 at% of Fe.…”

“…Generally, QS is an indicator of the local symmetry around the atom probe. Mössbauer transmission spectra of the doped-SnO 2 samples are very similar among themselves and were fitted to a doublet, characteristic of a quadrupole electric interaction at nucleus of Sn 4+ as expected for this type of material [11,13]. In figure 4, we present only a Mössbauer spectrum (MS) of Mn-doped SnO 2 powders, whereas the fitted Mössbauer parameters of all the samples are gathered in figure 3 (including un-doped SnO 2 taken as a reference).…”

“…The elemental analysis of the doped samples was provided by energy dispersive x-ray spectroscopy (EDX) in order to corroborate their chemical composition. Meanwhile the corresponding results of Fe-and V-doped SnO 2 are mentioned in [11,12], respectively, here we show EDX results of Co-and Mn-doped SnO 2 samples. The values of 3.8 5 at% for Co and 5.2 9 at% for Mn were estimated being in each case the average of eight inspected zones (for example, figure 1, corresponding to Co-doped SnO 2 ).…”

“…Figure 2 shows XRD patterns of Mn-and Co-doped samples, whereas the corresponding ones of Fe and V-doped samples were shown elsewhere [11,12]. In all the cases, cassiterite SnO 2 , which is isomorphic to rutile (space group P4 2 /mnm) was identified by the diffraction peaks presented in the shown patterns.…”

U-Pb Ages, O Isotope Compositions, Raman Spectrum, and Geochemistry of Cassiterites from the Xi’ao Copper-Tin Polymetallic Deposit in Gejiu District, Yunnan Province

“…Therefore, the Ti content played an important role in the luminescence intensity of CL images of the Xi'ao cassiterites. In addition, A 1g was one of the characteristic peaks of cassiterite, whose Raman frequency could be significantly affected by impurities [69][70][71]85]. In Figure 6, low-frequency drift of A 1g may have been caused by the substitution of Sn by Nb, Ta, Fe, and Mn [70].…”