Effect of simultaneous Ti and Nb doping on structure and ionic conductivity of Bi2V1−xTix/2Nbx/2O5.5−δ (0.1 ≤ x ≤ 0.25) ceramics

Tripathy, Diptimayee; Saikia, Amarjyoti; Pandey, Arvind Kumar

doi:10.1007/s11581-018-2622-3

Cited by 9 publications

(4 citation statements)

References 41 publications

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“…[13] was followed to obtain the real impedance of the samples. Figure 1(a) shows the diffraction pattern of specimens calcined at 650 ℃ in which impurity peak (shown by *) of BiVO 4 (secondary phase) [17] has been observed for all compositions which has gradually become prominent with an increase in dopant concentration. The X-ray diffractograms of specimens after calcination at 750 ℃ and sintering at 800 ℃ are shown in Figs.…”

Section: Electrical Characterizationmentioning

confidence: 99%

“…This high ionic conductivity in the intermediate temperature range compared to other fluorite and perovskite-type electrolytes make BIMEVOXes as potential electrolytes viable for low temperature operation. Furthermore, in order to obtain improved ionic conducting properties, BIMEVOX group has also been explored as a different system, i.e., BIMEME*VOX [13][14][15][16][17] by double substitution at both Bi/V and/or only V-sites.…”

Section: Introductionmentioning

confidence: 99%

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Role of Al and Ti doping in modulating electrical properties of BIVOX system

et al. 2019

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The doubly-doped bismuth vanadate with Al and Ti having formula unit, Bi 2 V 1-x Al x/2 Ti x/2 O 5.5-δ (0.10 ≤ x ≤ 0.25) was synthesized. The specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), differential scanning calorimetric (DSC), UV-Vis, and electrochemical impedance spectroscopy (EIS) for their structural, thermal, optical, and electrical studies. Influence of both dopant cations (Al and Ti) was observed in the gradual stabilization of the tetragonal phase of Bi 2 VO 5.5-δ with dopant amount. A non-uniform grain growth phenomenon was observed up to x = 0.175, with dopant addition. UV-Vis study revealed the comparatively higher order of oxide ion vacancies for the composition x = 0.175. Impedance spectroscopy measurements indicate a significant decrease of both the grain (R g ) and grain boundary resistances (R gb ) with the rise in temperature and the overall resistance is found to be dominated by the grain interior contribution. Enhancement of ionic conductivity was found in all the compositions in the intermediate temperature range as compared to the parent compound, and the single Al-doped system and the highest value were obtained for x = 0.175. vanadate, Bi 2 VO 5.5-δ (where δ denotes the oxygen-ion vacancy) surfaced in the late eighties is of immense importance because of its visibly good ionic conductivity values at relatively low temperature viz. 0.2 S·cm -1 at ~600 ℃ [6]. However, the problem with this compound is of multiple phase transitions (i.e., α↔β and β↔γ between 420 and 450 ℃ and between 540 and 560 ℃ , respectively) and the highest conductivity is found in tetragonal polymorph known as γ-polymorph or phase [6,7]. Therefore, stabilization of this phase at room temperature is essential. The 490

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Section: Electrical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of Al and Ti doping in modulating electrical properties of BIVOX system

et al. 2019

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“…The V–O bond asymmetric stretching is shown by the peak at 832 cm −1 while the V–O bond symmetric vibration stretching is shown by the peak at 766 and 715 cm −1 53 , 54 . There are peaks visible at 613, and 529 that show the (O–V–O) vanadate anion deformation 55 , 56 .…”

Section: Resultsmentioning

confidence: 99%

Ball-milling synthesized Bi2VO5.5 for piezo-photocatalytic assessment

Kumar

Vaish

Kebaïli

et al. 2023

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The mechanochemical ball milling followed by heating at 650 °C for 5 h successfully produced the single-phase Bi2VO5.5 powder. Catalytic activity for methylene blue dye degradation was investigated. Raman spectroscopy and X-ray diffraction were used to confirm the phase formation. The sample’s charge carrier transportation behavior was ascertained using time-dependent photocurrent analysis. The piezo-photocatalysis experiment yielded a 63% degradation efficiency for the ball-milled Bi2VO5.5 sample. The pseudo-first-order kinetics of the piezo-photocatalytic dye degradation are discerned, and the significant k value of 0.00529 min−1 is achieved. The scavenger test declares the h+ radical is the predominant active species during the piezo-photocatalysis experiment. Vigna radiata seeds were used in a phytotoxicity test to evaluate the germination index. The mechanochemical activation method facilitates reactions by lowering reaction temperature and time. The effect of improved piezo-photocatalytic efficiency on the ball-milled Bi2VO5.5 powder is an unexplored area, and we have attempted to investigate it. Here, ball-milled Bi2VO5.5 powder achieved improved dye degradation performance.

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“…One of the oxide materials that had high oxide ion conductivity and the potential application was Bi2V1-xMexO5.5-σ (BIMEVOX), where ME was dopant [1][2][3]. Dopant at a certain concentration plays an important role in improving the ease of oxygen ions migration of Bi2VO5.5 [4][5]. Therefore, in addition to the migration path of oxygen ions, the search for a type of dopant with a certain concentration was needed to obtain BIMEVOX with high conductivity.…”

Section: ■ Introductionmentioning

confidence: 99%

Highest Ionic Conductivity of BIMEVOX (ME = 10% Cu, 10% Ga, 20% Ta): Computational Modeling and Simulation

et al. 2020

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BIMEVOX had the potential to play an important role in solid oxide fuel cell, especially as the electrolyte due to their high ionic conductivity. In this work, oxide ion migrations of γ-Bi2VO5.5 and BIMEVOX were simulated using density function theory (DFT), Mott-Littleton method, and molecular dynamic simulation. In γ-Bi2VO5.5, there were oxygen vacancies at the equatorial position in the vanadate layers. These vacancies could facilitate oxide ions migration. The Enthalpy of the oxide migration for γ-Bi2VO5.5 based on DFT calculation was 0.38 eV, which was in a good agreement with experimental results. The γ-Bi2VO5.5 can be stabilized by partial substitution of V5+ with Cu2+, Ga3+, and Ta5+. Defect simulation results using the Mott-Littleton method showed that the total maximum energies of region II were achieved at concentrations of 10, 10, and 20%, respectively for Cu2+, Ga3+, and Ta5+. The calculated concentration of Cu2+, Ga3+, and Ta5+ were in a good agreement with those of experiment results, where the highest ionic conductivity obtained. The results of the molecular dynamics simulation showed that the activation energies of oxide ion migration in γ-Bi2VO5.5 and BIMEVOX (ME = Cu and Ta) respectively were 0.19, 0.21, and 0.10 eV, close to experimental values.

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Effect of simultaneous Ti and Nb doping on structure and ionic conductivity of Bi2V1−xTix/2Nbx/2O5.5−δ (0.1 ≤ x ≤ 0.25) ceramics

Cited by 9 publications

References 41 publications

Role of Al and Ti doping in modulating electrical properties of BIVOX system

Role of Al and Ti doping in modulating electrical properties of BIVOX system

Ball-milling synthesized Bi2VO5.5 for piezo-photocatalytic assessment

Highest Ionic Conductivity of BIMEVOX (ME = 10% Cu, 10% Ga, 20% Ta): Computational Modeling and Simulation

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