Effects of ageing on defect structure in the Bi3NbO7–Bi3YO6 system

The exchange interactions and the state of manganese atoms in the solid solutions in Bi3NbO7 of cubic and tetragonal modifications

“…Such a conclusion agrees with the assumption about clustering of niobiumoxygen octahedra advanced as the result of examining the superstructure in cubic and tetragonal bismuth niobate and in the solid solutions [3,8,9,[17][18][19][20][21]. The formation of dimers rather than more complex clusters or chains of paramagnetic atoms seems to be associated with a low concentration of paramagnetic atoms in the solid solutions under study.…”

“…Niobium atoms are located in distorted octahedra of oxygen atoms [9,14]. As a result of examining the crystal structure of bismuth niobate and its solid solutions by the methods of neutron and electron diffraction niobium atoms were found to be distributed in the lattice in a non-statistic manner [9,10,[14][15][16][17][18][19][20][21]. Niobium-oxygen octahedra are combined in chains and blocks via oxygen atoms.…”

“…Heterovalent substitution of 3d-element atoms, of Zr, Y, W, Er for niobium atoms results in an increase in conductivity [17][18][19][20][21]. The nature of the current carriers and the mechanism of conductivity of bismuth niobate are studied in [22,23].…”

Oxide ion distribution and conductivity in Bi7Nb2−2xY2xO15.5−2x

“…A full solid solution was observed in that system based on a fluorite δ-phase type structure. The compositional and temperature dependence of the defect structure was reported, while in subsequent studies ageing effects in the system were also investigated [13].…”

Does the low optical band gap of yellow Bi3YO6 guarantee the photocatalytical activity under visible light illumination?

“…The defect structure, vacancy ordering, and oxygen ion transport in the Bi 3 YO 6 δ-phase were studied using ab initio molecular dynamic, as well as total neutron scattering analysis [15][16][17]. Ionic transport in a material and its defect structure are commonly tested in Bi 3 NbO 7 -Bi 3 YO 6 systems [18,19] and in tungsten-doped Bi 3 YO 6 [20].…”