The Meyer–Neldel rule in amorphous TiO₂ films with different Fe content

Abstract

Abstract

Sol–gel iron-doped TiO2 nanopowders with photocatalytic activity

“…Results have been controversial, depending on multiple factors such as iron precursor and content, preparation technique, temperature of calcination [20][21][22][23]. Doping with Fe 3+ could introduce much more oxygen vacancies in the crystal lattice and on the surface of TiO 2 , which favours the adsorption of water and formation of surface hydroxyl groups, as well as promoting the photocatalytic activity [24].…”

Improved immobilization of Re(VII) from aqueous solutions via bimetallic Ni/Fe0 nanoparticles: Implications towards Tc(VII) removal

“…The fitting analysis of the obtained spectra indicated that Fe 0 and Ni/Fe 0 materials yielded peaks patterns close to that of Fe foil reference, at 7,092-7,095 eV, and about 7,111.78 eV. Fe(II) broad peak was observed in Fe 0 and Ni/Fe 0 materials at about 7,110.79 eV, while Fe(III) peaks at about 7,113.66 and 7,127.25 eV were totally suppressed (Mardare et al, 2012;Grillet et al, 2014;Liu et al, 2019Liu et al, , 2021. Such results indicated that Fe oxidation state in both Fe 0 and Ni/Fe 0 materials involved both Fe 0 and Fe(II) states, reflecting the partial oxidation of Fe 0 -core and the involvement of Fe 0 , as an electron donor, in the reductive immobilization of Re(VII).…”

Synthesis and study of ScN thin films

“…It is worth mentioning here that in the present study, Sc Kedge of pure Sc thin film sample does not replicate the XAFS spectra of Sc 2 O 3 studied by Chassé et al [58], consistent with our XRD data analysis. Since, fluorescence detected XAFS is known to be a bulk sensitive technique with penetration depth ranging in micrometers [51] compared to surface sensitive SXAS where the depth scale ranges only in nanometer scale (≈10 nm) [29], the averaged out bulk information from the XAFS data further confirms the presence of higher surface oxidation in the samples as was evidenced from the Sc L-edge and O Kedge SXAS spectra. [59] and Fm 3m [15], respectively.…”

“…In the pre-edge region, an intense feature 'E' can be seen for Sc sample and with R N2 flow at 1.6%, it gets feeble. Such intense pre-edge feature has previously been reported for metallic hcp Ti (for both foil and film) with hexagonal symmetry and has been attributed to 1s → 3d electric quadrupole transition (∆l = ±2) [50,51]. It is conventional that pre-edge features differ due to different geometrical parameters such as, inversion symmetry, co-ordinations and bonding configurations (e.g.…”