Structural disorder of ball-milled, nanosized, Fe-doped SnO2: X-ray diffraction and Mössbauer spectroscopy characterization

Dopant-Driven Nanostructured Loose-Tube SnO2 Architectures: Alternative Electrocatalyst Supports for Proton Exchange Membrane Fuel Cells

“…This is not unexpected, given the comparable ionic radii (0.69, 0.64, 0.68, and 0.72 Å for Sn 4+ , Nb 5+ , Nb 4+ , and Nb 3+ , respectively) that enable partial replacement of tin by niobium on the regular lattice site without significant cell volume variations. Similarities in Nb and Sn outer shell electronic configurations make substitutional doping possible, as was evidenced recently for iron-doped SnO 2 . No supplementary diffraction peaks were detected that would indicate the presence of a segregated niobium oxide phase.…”

“…Similarities in Nb and Sn outer shell electronic configurations make substitutional doping possible, as was evidenced recently for iron-doped SnO 2 . 39 No supplementary diffraction peaks were detected that would indicate the presence of a segregated niobium oxide phase. The presence of the cassiterite structure was corroborated by Raman spectroscopy, where lines were observed at characteristic positions 40 (see the Supporting Information).…”

Direct microwave–hydrothermal synthesis of Fe-doped titania with extended visible-light response and enhanced H2-production performance

“…But the microstrain was found to increase as a function of iron content. Those results indicated that the average crystallite size can be misleading [39], and microstrain cannot be ignored in samples prepared by microwave-hydrothermal method.…”

Synthesis and properties of Sn1−xFexO2 nanoparticles obtained by a proteic sol–gel method

“…In addition, the larger values of quadrupole splitting found for doublet 2 are attributed to oxygen-deficient octahedral iron sites. In fact, oxygen-deficient octahedra carry enlarged electric field gradients and consequently larger values of quadrupole splitting (Beltran et al 2010;Ferrari et al 2016;Ribeiro et al 2012). The large area of doublet 2 in the spectrum of nanoparticles with Fe content of 10 at% reveals a very high number of oxygen vacancies.…”

“…The synthesis of pure and doped SnO 2 has been carried out by different methods such as solid-state reaction methods (Ahmed 2010), chemical precipitation (Ferrari et al 2016;Shayesteh and NosratiThe 2015), conventional sol-gel (Inpasalin et al 2016;Mehraj et al 2015), and mechanical milling (Ribeiro et al 2012;Pereira et al 2017a). It is well known that the synthesis method and the precursors employed in the preparation of these semiconductors can determine the physico-chemical, morphological, and electrical properties of the final product.…”