Investigation of phase stability and oxide ion performance in new perovskite-type bismuth vanadate

Al-Alas, Ahlam; Beg, Saba; Al-Areqi, Niyazi A.S.

doi:10.1016/j.matchemphys.2012.05.063

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…This increment is because of the replacement of the larger-size cation Tb 3+ (1.18 A°) in the place of the smaller cation vanadium (V 5+ = 0.54 A°). As a result, the parent compound structure is disrupted and a more stable phase is adapted. ,− …”

Section: Resultsmentioning

confidence: 99%

Ex Situ Method for Photoreduction of the Cadmium Ion from Terbium-Loaded Bismuth Vanadium Oxide

2021

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The photoreduction of Cd (II) to Cd (0) was performed using Bi 4 V 2 O 11 , which was tremendously enhanced by Tb 3+ -doped Bi 4 V 2 O 11 . The relationship between charge carrier isolation and light harvesting was studied in depth in this research, and a promising technique for fabricating effective photocatalysts for heavy metals was discovered. Lattice disorder effects due to size variance between V 5+ and Tb 3+ cations in Bi 4 V 2 O 11 nanomaterials substituted with an invariable Tb 3+ cation at different concentrations (x = 15, 20, and 25%). Bi 4 V 2 O 11 and 15% Tb/Bi 4 V 2 O 11 evidenced a coexistence of monoclinic (α-phase) with a CS/m symmetry, while 25% Tb/Bi 4 V 2 O 11 was tetragonal (γ-phase) with an I4/mmm symmetry. Raman scattering experiments elucidated the changes in Bi 4 V 2 O 11 lattice corresponding to oxygen motion, suggesting significant destabilization of the VO 4 tetrahedra after addition of Tb 3+ . The SEM micrograph depicted a disparity in the microstructure with reduced grain size in 25% Tb/ Bi 4 V 2 O 11 samples. However, the TEM micrographs of 25% Tb/Bi 4 V 2 O 11 nanomaterials revealed that crystallite sizes of 25−35 nm were obtained, presenting a single tetragonal phase, highly homogeneous in nature. Impedance spectroscopy was used to study the conductivity of these compounds in the temperature range of 300 °C. At 300 °C, the compounds with x = 25% showed a conductivity of 15.92 S cm −1 . The conductivity values were found to be comparable with the highest values reported in the literature for similar compounds.

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