Solution combustion synthesis of iron tungstate nanoparticles for photoelectrochemical water splitting towards oxygen evolution

Electronic, Vibrational, and Structural Properties of the Natural Mineral Ferberite (FeWO4): A High-Pressure Study

“…Experimentally, we have determined the band gap energy by means of a Tauc analysis (see the inset of Figure ); therefore, the reported value should be assumed as the lower limit value of E g . We obtained E g = 2.00(5) eV, which is between the previously reported values. ,− This means that the calculated band gap energy is slightly underestimated, but the underestimation, 0.2 eV, is within typical differences between DFT and experiments. , However, this does not affect the determination of the pressure dependence of E g . In Figure , we present the electronic density of states, which shows that Fe states are the main contributors to the top of the valence band and hybridized W and O orbitals dominate the bottom of the conduction band.…”

“… 59 We obtained E g = 2.00(5) eV, which is between the previously reported values. 10 , 12 − 14 This means that the calculated band gap energy is slightly underestimated, but the underestimation, 0.2 eV, is within typical differences between DFT and experiments. 23 , 60 However, this does not affect the determination of the pressure dependence of E g .…”

“…FeWO 4 is one of the less studied AWO 4 wolframites . Curiously, most studies on this material have focused on nanoparticles, , with single crystals mainly synthesized to characterize their magnetic properties . FeWO 4 showed an antiferromagnetic behavior at low temperatures with a Néel temperature of 75 K .…”

“…FeWO 4 is one of the less studied AWO 4 wolframites. 1 Curiously, most studies on this material have focused on nanoparticles, 11 , 12 with single crystals mainly synthesized to characterize their magnetic properties. 10 FeWO 4 showed an antiferromagnetic behavior at low temperatures with a Néel temperature of 75 K. 10 In particular, the characterization of the band gap energy at ambient conditions has been conducted on compacted powders using diffuse reflectance 10 , 12 − 14 rather than accurate optical absorption measurements on single crystals.…”

“… 1 Curiously, most studies on this material have focused on nanoparticles, 11 , 12 with single crystals mainly synthesized to characterize their magnetic properties. 10 FeWO 4 showed an antiferromagnetic behavior at low temperatures with a Néel temperature of 75 K. 10 In particular, the characterization of the band gap energy at ambient conditions has been conducted on compacted powders using diffuse reflectance 10 , 12 − 14 rather than accurate optical absorption measurements on single crystals. 15 As a consequence, the reported values of the band gap energy range from 1.8 to 2.2 eV.…”