Effect of V2O5 on electrical and microstructural properties of ZnOceramics

Mirzayi, M.; Hekmatshoar, Mohammad Hossein

doi:10.1016/j.physb.2013.01.020

Cited by 20 publications

(9 citation statements)

References 14 publications

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“…The non-linear electrical behavior given by the coefficient a is due to solid state reactions and formation of potential barriers between grains (Mirzayi and Hekmatshoar 2013). More the curve is pronounced more a is great.…”

Section: Resultsmentioning

confidence: 99%

The effect of the starting powders particle size on the electrical properties of sintered Co doped ZnO varistors

Hamdelou¹,

Guergouri

Arab

2014

Appl Nanosci

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Pure and Co doped zinc oxide nanopowders have been synthesized by sol-gel route. The obtained powders, after calcination in air at 550, 650, 750 and 850°C, were consolidated and sintered using microwaves. The effect of sintering temperature on the density and electrical properties was investigated. The best characteristics are obtained using a sintering temperature equal to 1,075°C. The powders and sintered samples are characterized by X-ray diffraction, microstructure images, density and electrical measurements. The studied nanopowders have: a density of 5.22 (g/cm 3 ), a breakdown voltage of 446.5 V/mm and a coefficient of non-linearity of 11.48 for ZnO doped with 7 mol% Co, and a density of 5.19 (g/cm 3 ), a breakdown voltage of 292.5 V/mm and a non-linearity coefficient of 11.62 for ZnO doped with 5 mol% Co. The XRD results indicate that pure and Co doped ZnO powders are solid solutions crystallizing in pure würtzite structure, and consisted of a mixture of nanoparticles with an average grain size between 36 and 210 nm. The grain size decreases with increasing Co concentration and reaches its lowest value at 7 mol% Co and increases with increasing temperature. On the other hand the increase of Co concentration leads to a decrease of the porosity and an increase of the density of samples sintered at 1,070°C and leads also to an increase of the electric field (E) in the nonlinear area. The samples of 5 mol% Co sintered at 1,075°C, show that the non-linear coefficient a decreases by increasing of calcined temperature, therefore increases with decreasing of grain and particle sizes.

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Section: Resultsmentioning

confidence: 99%

The effect of the starting powders particle size on the electrical properties of sintered Co doped ZnO varistors

Hamdelou¹,

Guergouri

Arab

2014

Appl Nanosci

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“…With adding vanadium, bar like morphology were obtained as well as nearly spherical ones. It was reported that adding vanadium to zinc oxide forms liquid phase during calcination which may cause abnormal grain growth in some crystallographic directions . The MAP analysis revealed the presence of Zn, O, and V elements.…”

Section: Resultsmentioning

confidence: 99%

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

Shahi

Hassanzadeh-Tabrizi

Saffar‐Teluri

2017

Int J Applied Ceramic Tech

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In the present work, vanadium-doped ZnO nanoparticles with different V concentrations were prepared via microemulsion method and employed as an effective photocatalyst for the degradation of methylene blue. The prepared samples were characterized by different techniques such as thermogravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental mapping (MAP), and ultraviolet-visible spectroscopy (Uv-Vis). The XRD patterns of vanadium-doped samples were assigned to wurtzite structure of ZnO and vanadium ions were incorporated into the lattice of zinc oxide. SEM images showed that the synthesized pure zinc oxide has irregular morphology and with adding vanadium dopant, rod and cube-like morphology appeared. The band gap energy of pure ZnO decreased from 3.3 to 3.21 eV on adding 1% vanadium. The results showed that the zinc oxide doped with 1% vanadium exhibited better photocatalytic activity compared to other samples. The possible mechanism for improving of photodegradation efficiency of doped samples was also discussed. K E Y W O R D S microemulsion, nanoparticles, photocatalyst, vanadium, ZnO

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“…where Zn • i and Zn •• i are single and double ionized interstitial zinc atoms, respectively [9]. In order to understand the formation of possible defects in the samples in more detail, the samples were examined using the PL spectroscopy and will be discussed below.…”

Section: Resultsmentioning

confidence: 99%

“…It is reported that V 2 O 5 can be partly dissolved into the ZnO matrix and V 5+ ions enter the interstitial sites in ZnO [9]. The solubility of V 2 O 5 was estimated to be ≤0.5 wt.% [25].…”

Section: Resultsmentioning

confidence: 99%

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Influence of V2O5 and B2O3 addition on the sintering behaviour and physical properties of ZnO ceramics

Yüksel

Hardal

Kınacı

2022

PAC

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The effect of V2O5 and B2O3 additions on sintering behaviour and physical properties of ZnO ceramics was investigated. XRD studies revealed ZnO as main phase with a hexagonal wurtzite-type structure. The V2O5 addition is the reason for an increase in grain size and some grains of oblong shape morphology in the ZnO ceramics. The dual addition of V2O5-B2O3 improved the liquid-assisted sintering of ZnO ceramics and resulted in further increase in grain size with more uniform grain growth. The reduction of sintering temperature to 900?C for ZnO ceramics was observed with the dual addition of V2O5 and B2O3. The room temperature PL spectra of the Z (ZnO), ZV (ZnO with 0.5mol% V2O5) and ZVB (ZnO with 0.5mol% V2O5 and 0.5mol% B2O3) ceramics revealed broad visible emission band because of impurities and defects in ZnO ceramics caused by oxygen vacancies due to vanadium and boron additions, as well as zinc interstitials. This emission band between 450-750 nm includes the entire visible region from blue to red.

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Effect of V2O5 on electrical and microstructural properties of ZnOceramics

Cited by 20 publications

References 14 publications

The effect of the starting powders particle size on the electrical properties of sintered Co doped ZnO varistors

The effect of the starting powders particle size on the electrical properties of sintered Co doped ZnO varistors

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

Influence of V2O5 and B2O3 addition on the sintering behaviour and physical properties of ZnO ceramics

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