Effect of two different sites substitution on structural and optical properties of Bi4V2O11−δ

Kaur, Rupanjit; Thakur, Samita; Singh, K.

doi:10.1016/j.physb.2014.01.032

Cited by 13 publications

(7 citation statements)

References 45 publications

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“…(0.61 A ˚). Size difference of the guest and the host atom plays important role in such substitutions (Kaur et al 2014). The noticeable change in the parameter ''c'' in comparison with ''a'' suggests that transition metal ions substitute Ti 4?…”

Section: Resultsmentioning

confidence: 99%

Transition metals (Mn, Ni, Co) doping in TiO2 nanoparticles and their effect on degradation of diethyl phthalate

Kaur

Singla

Singh

2017

Int. J. Environ. Sci. Technol.

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Transition metal-doped TiO 2 nanoparticles are synthesized by sol-gel method. The as-prepared samples are characterized by various techniques to correlate structural and optical properties with chemical nature of dopants and their effect on photocatalytic degradation of diethyl phthalate esters. X-ray diffraction (XRD) reveals that all the samples are crystalline and exhibit anatase as a major phase. Chemical nature of dopants could not affect the formation of anatase and its volume fraction. The crystallite size of undoped and doped TiO 2 nanoparticles varies between 10 and 12 nm as confirmed by XRD and transmission electron microscope. The lowest optical band gap observed is 2.47 eV in Mn-doped TiO 2 . Among all the samples, Ni-doped TiO 2 sample shows better photocatalytic activity and degradation of diethyl phthalate due to its lower crystallite size and higher surface area than those of Mn-and Co-doped TiO 2 samples.

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Section: Resultsmentioning

confidence: 99%

Transition metals (Mn, Ni, Co) doping in TiO2 nanoparticles and their effect on degradation of diethyl phthalate

Kaur

Singla

Singh

2017

Int. J. Environ. Sci. Technol.

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“…The widening in the energy band gap value that is associated with wider energy band tails could be accounted to the increased degree of disorder in the electronic stated resulting from producing thinner films and from participation of Pb in the structure of WO 3 . Consistent with our experimental findings (E 0.19 U = eV for glass/WO 3 films of thicknesses of 1.0 m m and not found in glass/WO 3 films of thicknesses of 300 nm but exhibit value of 0.94 eV for Pb/WO 3 ), earlier studies which aimed at exploring the film thickness effect on the width of Urbach energy and band gap reported that the thinner the films are the wider the energy band tail state and the wider the energy band gap [25]. As for examples GeSe 0.5 S 1.5 films of thicknesses of 710 nm showed E U and E g values of 1.78 eV and 0.39 eV, respectively.…”

Section: Optical Spectroscopy Analysesmentioning

confidence: 94%

Lead-tungsten oxide interfaces designed as gigahertz/terahertz filters

Alkhamisi¹,

Qasrawi

Khanfar

2023

Phys. Scr.

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Herein amorphous tungsten oxide thin films of thicknesses of 300 nm are coated onto semitransparent Pb films (100 nm) by the thermal evaporation technique under a vacuum pressure of 10-5 mbar. Optical investigations in these films have shown that Pb nanosheets enhances the light absorbability in the visible and infrared ranges of light without significant change in the energy band gap value. In addition deep analyses of the optical conductivity and terahertz cutoff frequency spectra of the Pb/WO3 optical filters revealed that the cutoff frequency value in the visible range of light is invariant with light signal energy indicating the possibly of filtering none-monochromatic light signals. On the other hand imposing an ac signal between the terminals of Pb/WO3/Au devices has proofed the ability of the device to perform as low pass and as band stop filters workable in the microwave frequency domain. The microwave cutoff frequency for this device reached ~9 GHz nominating it for use in 5G mobile technology. The current study showed that coating of tungsten oxide onto semitransparent Pb substrate and coverage small area of the top contact with Au can allow functioning the device as gigahertz/ terahertz band filters suitable for communication technology.

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“…The same band shift was observed when Bi was substituted by Pb in the BiO6 units. This shift was explained by the perturbation of the Bi-O units by Pb [13], which also affects V-OA units. In this case, this band is attributed to the stretching vibration of the Bi-O groups located in distorted octahedral units [13,[43][44].…”

Section: Solid Solutions' Characterizationmentioning

confidence: 99%

“…This shift was explained by the perturbation of the Bi-O units by Pb [13], which also affects V-OA units. In this case, this band is attributed to the stretching vibration of the Bi-O groups located in distorted octahedral units [13,[43][44]. Our results confirm that the V-OA bond is also influenced by the Al/V substitution in the VO6 units.…”

Section: Solid Solutions' Characterizationmentioning

confidence: 99%

A study on structural properties, conductivity and FT-IR spectroscopy of Cu–Al doubly substituted Bi4V2O11

Essalim¹,

Ammar²,

Zamama³

et al. 2020

Journal of Solid State Chemistry

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The double-substituted solid solutions Bi4V2-xCux/2Alx/2O11-5x/4, with identical quantitative compositions of Cu 2+ and Al 3+ ions, can occur for a substitution rate 0.1 ≤ x ≤ 0.6. The compound with x = 0.1 is found to be a monoclinic α-form of Bi4V2O11, whereas compounds with 0.2 ≤ x ≤ 0.6 are found to be tetragonal γ and γ' polymorphs. We used electrochemical impedance spectroscopy to measure the electrical conductivity of doped samples in the temperature range of 250-700 °C. The slope changes observed in the Arrhenius plots might be related to the microstructural transitions occurring in these compounds. The sample with x = 0.2 shows the highest ionic conductivity values.

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Effect of two different sites substitution on structural and optical properties of Bi4V2O11−δ

Cited by 13 publications

References 45 publications

Transition metals (Mn, Ni, Co) doping in TiO2 nanoparticles and their effect on degradation of diethyl phthalate

Transition metals (Mn, Ni, Co) doping in TiO2 nanoparticles and their effect on degradation of diethyl phthalate

Lead-tungsten oxide interfaces designed as gigahertz/terahertz filters

A study on structural properties, conductivity and FT-IR spectroscopy of Cu–Al doubly substituted Bi4V2O11

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