X-ray Diffraction Analysis of a Class of AlMgCu Alloy Using Williamson–Hall and Scherrer Methods

Nwaokafor, Placid; Okeoma, Kelechukwu B.; Echendu, O. K.; Ohajianya, Anthony Chibuike; Egbo, Kingsley O.

doi:10.1007/s13632-021-00792-0

“…Furthermore, the diffraction peak corresponding to (100) orientation for Si substrate is observed in both the samples [31]. Moreover, d-spacing (inter layer distance) and crystal size (D) was also calculated for both the samples using Bragg's law [32] ( ) q l = n d 2 sin (1) and Scherrer's formula [33] (D=0.9λ/β q cos ) (2) respectively. The calculated d-spacing and crystallite size values are represented in table 1 of both axial HS NW and HS TF.…”

Section: Structural and Morphological Analysismentioning

confidence: 99%

A novel high performance photodetection based on axial NiO/β-Ga₂O₃ p-n junction heterostructure nanowires array

Pedapudi¹,

Dhar²

2022

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Axial NiO/β-Ga2O3 heterostructure (HS) nanowires (NWs) array was fabricated on Si substrate by catalytic free and controlled growth process called glancing angle deposition (GLAD) technique. The field emission scanning electron microscope image shows the formation of well aligned and vertical NWs. A typical high resolution transmission electron microscope image confirms the formation of axial HS NWs consisting of β-Ga2O3 NW at the top and NiO NW at the bottom with an overall length ~ 213 nm. A large photo absorption and also photoemission was observed for axial NiO/β-Ga2O3 HS NW as compared to the NiO/β-Ga2O3 HS thin film (TF) sample. Moreover, X-ray photoelectron spectroscopy analysis prove that there are higher oxygen vacancies with no deviation in electronic state after the formation of axial HS NW. Also, a high performance photodetector (PD) with a very low dark current of 6.31 nA and fast photoresponse with rise time and fall time of 0.28 s and 0.17 s respectively at + 4 V was achieved using the axial NiO/β-Ga2O3 HS NWs. The type – II HS p-n junction formation and efficient charge separation at the small wire axis also makes this design to operate in self-powered mode.

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“…In the present study, the Williamson-Hall (W-H) method has been adopted for the estimation of the crystalline domain size of the synthesized samples, i.e., pure and Mn-doped ZnO. The simplified W-H diagnostic tool assumes that the broadening in Bragg’s peaks is the sum of peak broadening due to finite crystallite size and induced strain [54, 55]. The W-H equation is given as [56] (2) β Cos θ = K λ / D + 4 ε Sin θ , where “D” is the average crystallite size, K is the shape factor that is equal to 0.9, “ λ ” is the wavelength of X-rays (1.5406 A ° ), “ β ” is the full width at half of the maximum of diffraction peaks, “ θ ” is the Bragg’s angle, and “ ε ” represents the internal microstrain.…”

Section: Resultsmentioning

confidence: 99%

“…In the present study, the Williamson-Hall (W-H) method has been adopted for the estimation of the crystalline domain size of the synthesized samples, i.e., pure and Mn-doped ZnO. The simplified W-H diagnostic tool assumes that the broadening in Bragg's peaks is the sum of peak broadening due to finite crystallite size and induced strain [54,55]. The W-H equation is given as [56]…”

Section: (A) (Inset)mentioning

confidence: 99%

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Akram

¹

,

Fatima

²

,

Almohaimeed

³

et al. 2023

Adsorption Science & Technology

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Herein this study, pure and manganese- (Mn-) doped ZnO (2 wt. %) nanoparticles have been synthesized using the chemical precipitation method and characterized for the photodegradation of methyl green (MG) pollutant dye under natural sunlight. The structural analysis via XRD patterns has revealed that both intrinsic and Mn-doped ZnO (2 wt. %) samples have hexagonal wurtzite structures with appropriate phase purity, clearly indicating the absence of any external impurity. The incorporation of Mn in the host ZnO lattice has decreased the crystallite size (21.10 → 18.76 nm), and nanoparticle-type surface features with sizes in the 50–100 nm range have been observed through FESEM-based surface morphological studies. Both aforementioned observations have merit in providing more active area and a high surface area to volume ratio for photocatalytic reaction. The investigation of photophysical properties indicates that in Mn-doped ZnO nanoparticles, the absorption peak is blue-shifted by 5 nm (365 → 360 nm), due to the widening of the bandgap. The degradation kinetics of MG dye follow the pseudo-second-order kinetics, and the degradation efficiency has been observed to be 62.78% mediated by pure ZnO and 66.44% by Mn-doped ZnO (2 wt. %) photocatalyst under 60 minutes of sunlight irradiation. Specifically, the rate of photocatalytic reaction (K) ~0.01792 min-1 and R 2 ~0.97992 has been achieved for pure ZnO, whereas slightly higher (K) ~0.02072 min-1 and R 2 ~0.97299 have been observed for Mn-doped ZnO, respectively. Conclusively, the synergistic interactions with multiple charge transfer pathways, improvement of e−/h+ pair charge separation, improved surface area, and efficient generation of hydroxyl radicals are supposed to be responsible for the highly efficient photocatalytic activity of the Mn–doped ZnO photocatalyst for MG dye.

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Preparation and photoelectrochemical characterization of the Ca2Co2O5, as novel photocatalyst for the H2 photo-production

Saib

¹

,

Touahra

²

,

Azoudj

³

et al. 2022

J Solid State Electrochem

7

0

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X-ray Diffraction Analysis of a Class of AlMgCu Alloy Using Williamson–Hall and Scherrer Methods

Cited by 10 publications

References 43 publications

A novel high performance photodetection based on axial NiO/β-Ga₂O₃ p-n junction heterostructure nanowires array

A novel high performance photodetection based on axial NiO/β-Ga₂O₃ p-n junction heterostructure nanowires array

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Preparation and photoelectrochemical characterization of the Ca2Co2O5, as novel photocatalyst for the H2 photo-production

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X-ray Diffraction Analysis of a Class of AlMgCu Alloy Using Williamson–Hall and Scherrer Methods

Cited by 10 publications

References 43 publications

A novel high performance photodetection based on axial NiO/β-Ga2O3 p-n junction heterostructure nanowires array

A novel high performance photodetection based on axial NiO/β-Ga2O3 p-n junction heterostructure nanowires array

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Preparation and photoelectrochemical characterization of the Ca2Co2O5, as novel photocatalyst for the H2 photo-production

Contact Info

Product

Resources

About

A novel high performance photodetection based on axial NiO/β-Ga₂O₃ p-n junction heterostructure nanowires array

A novel high performance photodetection based on axial NiO/β-Ga₂O₃ p-n junction heterostructure nanowires array