Structural and impedance studies of TiIV and NbV co-doped bismuth vanadate system

Tripathy, Diptimayee; Pandey, Arvind Kumar

doi:10.1016/j.jallcom.2017.12.079

Cited by 21 publications

(12 citation statements)

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“…For this work, we have selected two aliovalent dopant cations: Al III and Ti IV for partial substitution of V in the parent compound. As far as single doped BIME III VOX system is concerned, it has been found from various previous reports that Al-doped Bi 2 VO 5.5-δ exhibits ionic conductivity value in the range of 10 -5 S·cm -1 at 300 ℃ [21][22][23] and in BIME IV VOX system, BITI IV VOX is the best regarding high ionic conductivity [13,14]. Hence, the prospect of the current work is to synthesize BIAl III TI IV VOX series by varying dopants amount and to study the role of the combination of Al III and Ti IV as substituent (at V-site) on crystal structure and ionic conductivity of the parent bismuth vanadate.…”

Section: Introductionmentioning

confidence: 97%

“…Due to perovskite related crystal structure, BIMEVOXes can accommodate a large concentration of mobile oxygen vacancies that are accountable for the rapid oxygen-ion conduction leading to the higher ionic conductivity than the parent compound. Typical examples include Cu, Co, Ni, and Ti doped BIMEVOXes having ionic conductivity values as high as ~10 -3 S·cm -1 at 300 ℃ [8,[10][11][12][13][14]. 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.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

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Section: Resultsmentioning

confidence: 70%

“…The results are shown in Figure 8. All diffraction patterns are similar with minor residuals of the BiVO 4 parent phase and were indexed for tetragonal the majority phase (PDF 86-0104) [46]. After the scanning electron microscopy and electrochemical impedance measurements, the sintered pellets were ground in an agate mortar for using the powders for the X-ray diffraction analyses.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

et al. 2019

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Bi 4 V 1.8 Ti 0.2 O 11 (BITIVOX) ceramic pellets, prepared with powders obtained by a sol gel technique, were sintered either conventionally at 800 • C/8 h or by applying an AC electric voltage, limiting the electric current through the pellets. Electric voltages were applied isothermally at 700 • C and 800 • C during 5 min in the green pellet positioned in the sample holder of a dilatometer for monitoring thickness variation. The BITIVOX pellets shrank 13.6% after applying 200 V cm −1 at 800 • C and 10.4% heating to 800 • C for 8 h. Thermal analysis and X-ray diffraction of the powders were performed to evaluate the crystallization temperature and the structural phase, respectively. The electrical behavior of the sintered BITIVOX pellets was analyzed by the impedance spectroscopy technique, showing that the sample flash sintered at 800 • C/5 min had lower bulk resistivity than the sample conventionally sintered at 800 • C/8 h. The surfaces of the sintered pellets were observed in a scanning electron microscope showing similar grain sizes and pore content in all sintered samples.

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Conductivity and Phase Transition Study of Sr²⁺‐Substituted La₂Mo_1.95V_0.05O_9–δ

Tado

Pandey

2020

Physica Status Solidi (b)

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Solution combustion technique is used for synthesizing La2−xSrxMo1.95V0.05O9−δ (x = 0–0.14). The properties of these compounds are investigated via X‐ray diffraction (XRD), scanning electron microscopy, differential scanning calorimetry (DSC), and electrochemical impedance spectroscopy. No secondary phases are detected in XRD. Complete suppression of αβ phase transition is evident via RT‐XRD and DSC in all doped compounds. Throughout the temperature regime, conductivity is enhanced compared with parent La2Mo2O9. The conductivity plot reveals an Arrhenius to Vogel–Tammann–Fulcher (VTF) type of temperature‐dependent conduction behavior.

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Structural and impedance studies of TiIV and NbV co-doped bismuth vanadate system

Cited by 21 publications

References 36 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

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

Conductivity and Phase Transition Study of Sr²⁺‐Substituted La₂Mo_1.95V_0.05O_9–δ

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Structural and impedance studies of TiIV and NbV co-doped bismuth vanadate system

Cited by 21 publications

References 36 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

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

Conductivity and Phase Transition Study of Sr2+‐Substituted La2Mo1.95V0.05O9–δ

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Conductivity and Phase Transition Study of Sr²⁺‐Substituted La₂Mo_1.95V_0.05O_9–δ