Influence of Ni/Mo ratio on structural and electrical properties of double perovskite system Sr2Ni1+x Mo1−x O6−δ

Kumar, Pravin; Singh, Nitish Kumar; Singh, Rajesh Kumar; Singh, Prabhakar

doi:10.1007/s00339-015-9448-x

Cited by 21 publications

(3 citation statements)

References 33 publications

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“…where α L denotes the value of thermal expansion coefficient (TEC), L is the length of sample, ΔL is the change in length, and ΔT is the change in temperature. 75 The TEC values of all of the samples are approximately the same. This indicates that the introduction of 2% Ca 2+ and Sr 2+ does not change the TEC value.…”

Section: ■ Results and Discussionmentioning

confidence: 81%

“…This trend also indicates the absence of any kind of structural change in the studied temperature range. Thermal expansion coefficient (TEC) can be obtained using the following relation where α L denotes the value of thermal expansion coefficient (TEC), L is the length of sample, Δ L is the change in length, and Δ T is the change in temperature …”

Section: Resultsmentioning

confidence: 99%

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Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

et al. 2020

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We have studied alkaline-earth-metal-doped Y 3 GaO 6 as a new family of oxide-ion conductor. Solid solutions of Y 3 GaO 6 and 2% −Ca 2+ -, −Sr 2+ -, and −Ba 2+ -doped Y 3 GaO 6 , i.e., Y (3−0.06) M 0.06 GaO 6−δ (M = Ca 2+ , Sr 2+ , and Ba 2+ ), were prepared via a conventional solid-state reaction route. X-ray Rietveld refined diffractograms of all the compositions showed the formation of an orthorhombic structure having the Cmc2 1 space group. Scanning electron microscopy (SEM) images revealed that the substitution of alkaline-earth metal ions promotes grain growth. Aliovalent doping of Ca 2+ , Sr 2+ , and Ba 2+ enhanced the conductivity by increasing the oxygen vacancy concentration. However, among all of the studied dopants, 2% Ca 2+ -doped Y 3 GaO 6 was found to be more effective in increasing the ionic conductivity as ionic radii mismatch is minimum for Y 3+ /Ca 2+ . The total conductivity of 2% Ca-doped Y 3 GaO 6 composition calculated using the complex impedance plot was found to be ∼0.14 × 10 −3 S cm −1 at 700 °C, which is comparable to many other reported solid electrolytes at the same temperature, making it a potential candidate for future electrolyte material for solid oxide fuel cells (SOFCs). Total electrical conductivity measurement as a function of oxygen partial pressure suggests dominating oxide-ion conduction in a wide range of oxygen partial pressure (ca. 10 −20 −10 −4 atm). The oxygen-ion transport is attributed to the presence of oxygen vacancies that arise from doping and conducting oxide-ion layers of one, two-, or three-dimensional channels within the crystal structure. The oxide-ion migration pathways were analyzed by the bond valence site energy (BVSE)-based approach. Photoluminescence analysis, dilatometry, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy studies were also performed to verify the experimental findings.

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Section: ■ Results and Discussionmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

et al. 2020

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“…This indicates that there are two kinds of Mo centers in the lattices. This phenomenon is very popular in the reported molybdates, which can enhance the electronic conductivity [52] and facilitate the photocatalytic reactions [53]. It is obvious that the Te/V co-doped sample has more deteriorative asymmetric characteristics, which could be one of the reasons for the enhancement of photocatalysis.…”

Section: Discussionmentioning

confidence: 99%

Substitution-induced band modification and developmental changes of optical properties in Bi_6−xTe_xMo_2−xV_xO₁₅ (0 ⩽ x ⩽ 1) solid solutions

Huang

Zhou

Wei

et al. 2019

J. Phys. D: Appl. Phys.

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Bi6−xTexMo2−xVxO15 (0 ⩽ x ⩽1) solid solutions with loosely aggregated ball-like profiles were prepared via sol–gel synthesis. X-ray powder diffraction was used to investigate the crystal phase and structural characteristics. The UV–vis absorption measurements concluded that Te4+/V5+ co-doping could greatly modify the band gap of Bi6−xTexMo2−xVxO15 (0 ⩽ x ⩽ 1), i.e. the band energies possessed a decreasing trend with the increase of doping concentration. Consequently, the Te/V-doped samples could harvest more visible light in the longer-wavelength region. This is most favorable for photocatalytic performance. The improved photocatalysis was verified by Rhodamine B photodegradation in the presence of Bi6−xTexMo2−xVxO15 (0 ⩽ x ⩽ 1) under visible-light irradiation (λ ⩾ 420 nm). X-ray photoelectron spectroscopy measurements and impedance spectra were measured to elucidate the photocatalytic mechanisms. The improved photocatalysis was related to the microstructural changes and multivalent V and Mo ions.

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Structural and electrical characterizations of cerium (Ce3+)-doped double perovskite system Sr2NiMoO6−δ

et al. 2016

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Influence of Ni/Mo ratio on structural and electrical properties of double perovskite system Sr2Ni1+x Mo1−x O6−δ

Cited by 21 publications

References 33 publications

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

Substitution-induced band modification and developmental changes of optical properties in Bi_6−xTe_xMo_2−xV_xO₁₅ (0 ⩽ x ⩽ 1) solid solutions

Structural and electrical characterizations of cerium (Ce3+)-doped double perovskite system Sr2NiMoO6−δ

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Influence of Ni/Mo ratio on structural and electrical properties of double perovskite system Sr2Ni1+x Mo1−x O6−δ

Cited by 21 publications

References 33 publications

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y3GaO6

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y3GaO6

Substitution-induced band modification and developmental changes of optical properties in Bi6−x TexMo2−x V x O15 (0 ⩽ x ⩽ 1) solid solutions

Structural and electrical characterizations of cerium (Ce3+)-doped double perovskite system Sr2NiMoO6−δ

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Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

Signature of Oxide-Ion Conduction in Alkaline-Earth-Metal-Doped Y₃GaO₆

Substitution-induced band modification and developmental changes of optical properties in Bi_6−xTe_xMo_2−xV_xO₁₅ (0 ⩽ x ⩽ 1) solid solutions