Synthesis, magnetic and electrical transport properties of the Bi2InNbO7 compound

Thermal expansion and cation disorder in Bi2InNbO7

“…The pyrochlore phase in the Bi 2 O 3 -Nb 2 O 5 -ZnO system, (Bi 1.5 Zn 0.5 ) (Zn 0.5 Nb 1.5 )O 7 is one such example and as a consequence of its attractive dielectric properties it is under investigation for use in high-frequency multilayer capacitors [4][5][6]. Another Bi-Nb pyrochlore, Bi 2 InNbO 7 acts as a photocatalyst under UV radiation and the large band gap in this material, 2.7 eV, can be tuned by partially replacing the In with Fe [7,8].…”

Photoelectrochemical Hydrogen Production from Aqueous Solution Containing Cyanide Using Bi2MNbO7 (M = Al, Fe, Ga, In) Films on Stainless Steel as Photoanodes

“…These results can not be straightforward correlated with their band-gap values, degree of crystallinity or stoichiometric ratios as in the previous reports on photocatalytic degradation [59,60]. Electrical and photoelectrical transport properties seem to play a preponderant role on these photoelectrochemical systems [54,61]. Nevertheless, it is worth mentioning that nearly the same values of accumulated current density (about 180 mA/cm 2 9 min) and total amount of hydrogen produced (about 0.3 lmol) were obtained with all Bi 2 MNbO 7 films during the electrochemical process in the dark.…”

“…3e) is more defined that the corresponding pyrochlore reflections, indicating that the latter material achieves a higher crystallinity at the same annealing conditions. Previous reports indicated that the temperature to achieve the pyrochlore structure in the Bi-M-Nb-O system should be C900°C when powders are prepared by solid state reaction [54,55] Fig. 4.…”

“…This new series of promising photocatalysts for water decomposition with visible light was first synthesized as powders, by a solidstate reaction [53][54][55][56][57] and a sol-gel process [58], and recently as thin films, by sol-gel dip-coating [59][60][61].…”

Phase transitions in bismuth pyrostannate upon substitution of tin by iron ions

“…The easy substitution is ensured by the stability of the pyrochlore structure. For instance, pyrochlore Bi 2 InNbO 7 behaves as a photocatalyst under UV radiation; the large gap (2.7 eV) in this material arises at the partial replacement of In by Fe [19][20].…”