Multifunctional brownmillerite KBiFe2O5: Structural, magneto-dielectric, optical, photoelectrochemical studies and enhanced photocatalytic activity over perovskite BiFeO3

Structural, optical, and magnetic properties of KBiFe2O5 synthesized by a sol‐gel method using PVP as additive

“…More information can be found at Table . The simulated XRD diffractograms were compatible with the ones reported in the literature 2,11,13 and are shown in Figure 1. The monoclinic structure has a main peak at 11.2593° corresponding to the (100) plane, while the orthorhombic structure has two very intense peaks, one at 31.1818° associated to the (221) plane and another at 13.3720° associated to the (110) plane.…”

“…As discussed earlier, the KBFO 5 sample had a different type of structure, and, thus, different values for the magnetic properties are expected. These results show that KBFO with monoclinic structure presents a paramagnetic behavior, as shown in other studies 10,11 . On the other hand, the KBFO 3 and KBFO 4 samples that have more amount of a second phase (like sample KBFO 5) have magnetic properties with characteristics of a weak ferromagnetic material.…”

“…The remnant magnetization followed the same trend. The values of H C of samples KBFO 5, KBFO 3, and KBFO 2 were similar, around 150 Oe; however, the Hc of sample KBFO was lower (around 100 Oe), while of the sample KBFO 1 was the highest (300.17 Oe), which was slightly higher than one previously reported 11,13 . Figure 6 shows the magnetic properties obtained from the M x H curves.…”

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

“…Well known wide band gap semiconductors, such as TiO 2 and ZnO (bandgap > 3 eV), cannot perfectly match the broad ranges of solar radiation emphasizing the need to investigate new materials/composites with narrow bandgap 11 . Quite recently perovskite metal oxides, such as PbTiO 3 (2.75 eV), AgNbO 3 (2.86 eV), SrNbO 3 (1.9 eV), BiFeO 3 (2.1 eV), LaFeO 3 (2.4 eV), LaNiO 3 (2.42 eV) have been found to possess reasonable catalytic efficiency [12][13][14][15][16][17][18][19] . This encourages us to work with novel materials like oxygen deficient perovskites for sunlight-driven photocatalysis.To meet the above objectives, it is desirable to modify such structures with transition metal-N x active sites to enhance the charge transport features and hence the catalytic activity towards remediation of industrial wastewater 20,21 .…”

g-C3N4/Ca2Fe2O5 heterostructures for enhanced photocatalytic degradation of organic effluents under sunlight

“…For CCN50 sample Fe 2p 3/2 and Fe 2p 1/2 peaks appeared at 710.7 eV and 723.9 eV respectively with a B.E difference ~ 13.2 eV. This indicates that in both samples Fe existed in 3+ oxidation state 41 , 42 .The presence of octahedra and tetrahedra coordination species of Fe in Fe 2p XPS spectra is a clear indication of oxygen vacancies in brownmillerite CFO and CCN50 samples 35 , 43 . The XPS spectra corresponding to O1s for both CFO and CCN50 samples were deconvoluted into two peaks [Fig.…”