We reported on discovery of a new pyrochlore compound, (Bi1.88Fe0.12)(Fe1.42Te0.58)O6.87, which is characterized by the highest Fe content among all known pyrochlores. Using x-ray and neutron diffraction we determined its crystallographic properties. At 20K the pyrochlore developed strong spin coupling into the spin glass state. At tis temperature the influence of the magnetic coupling on dielektrik properties was shown, which confirms the magnetoelectric coupling. the band gap was determined to be lower then 2eV, which shows on a great potential of this compound for photocatalytic applications.
COBISS.SI-ID: 1894907
Surfactant-assisted anatase mesoporous TiO2 transparent films, along with P25 translucent films were successfully synthesized and deposited by dip-coating technique. Prepared films were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and N2 adsorption-desorption measurements. The hydrophilicity of films was assessed by water contact angle technique. The results revealed that the surfactant-assisted sol-gel films were homogeneous, crack-free, contained anatase phase only with small grain size, and showed an increase in BET surface area and wide range of pore size distribution compared to nonsurfactant treated sample. The optical properties and photocatalytic activity of the films for an azo dye, Plasmocorinth B (PB) degradation were analyzed with UV-Vis spectrometer. The photocatalytic activity of the synthesized anatase TiO2 films having high optical quality is comparable to the activity of reference commercial powder P25 films. Relevant results are presented and discussed as a function of the structure and morphology of coatings, which control enables a direct tailoring of the functional response. The high porosity, uniformity, transparency, reliability, photocatalytic activity, good adhesion with the substrate and the excellent performance under cycling operation displayed by surfactant-assisted anatase TiO2 coatings make it a good candidate to be considered in new emerging engineering applications
COBISS.SI-ID: 1829479
The effects of Ti/Si molar ratio and of the mesoporous silica structure were investigated measuring adsorption capacity and photocatalytic degradation of toluene in self-constructed gas reactor system. The adsorption capacity was decreasing as a function of the increasing Ti/Si molar ratio. However, the photocatalytic degradation proceeded faster for the Ti/Si molar ratio 1/1 compared to ratios 1/2 and 2/1. In general, the photocatalytic activity was considerably improved by using supported titania–silica catalyst with regard to an unsupported titania powder prepared from the same titania sol.
COBISS.SI-ID: 1544955