Site location of Al-dopant in ZnO lattice by exploiting the structural and optical characterisation of ZnO:Al thin films

Nakrela, A.; Benramdane, N.; Bouzidi, A.; Kebbab, Z.; Medles, M.; Mathieu, C.

doi:10.1016/j.rinp.2016.01.010

Cited by 138 publications

(67 citation statements)

References 24 publications

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“…The On the other hand, the peaks could be differentiated by their intensities, as reported elsewhere [25]. The intensity of the line depends on the elemental composition; hence, the impregnation of magnesium onto alumina reduced the intensity of the peaks compared with those of the Al 2 O 3 catalysts [26,27]. The typical XRD peaks of Mg particles were barely observed in the XRD pattern of Mg/Al 2 O 3 catalysts.…”

Section: Physicochemical Properties Of Catalystsmentioning

confidence: 59%

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

et al. 2019

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This paper evaluated the effect of calcination temperature and the use of Mg/Al2O3 on the decomposition of HFC-134a. Two commercialized catalysts, Al2O3 and Mg/Al2O3, were calcined at two different temperatures (500 and 650 °C) and their physicochemical characteristics were examined by X-ray diffraction, Brunauer–Emmett–Teller analysis, and the temperature-programed desorption of ammonia and carbon dioxide analysis. The results show that, in comparison to Al2O3, 5% Mg/Al2O3 exhibited a larger Brunauer–Emmett–Teller surface area and higher acidity. The relative amount of strong acid sites of the catalysts decreased with increasing calcination temperature. Although a more than 90% decomposition rate of HFC-134a was achieved over all catalysts during the sequential decomposition test of HFC-134a using a vertical plug flow reactor connected directly to a gas chromatography/mass spectrometry system, the lifetime of the catalyst differed according to the catalyst type. Compared to Al2O3, Mg/Al2O3 revealed a longer lifetime and less coke formation due to the increased Brunauer–Emmett–Teller surface area and weak Lewis acid sites and basic sites arising from Mg impregnation. Higher temperature calcination extended the catalyst lifetime with the formation of less coke due to the smaller number of strong acid sites, which can lead to severe coke formation. A valuable by-product, trifluoroethylene, was formed as a result of the decomposition. Based on the experimental results, a reaction is proposed which reasonably explains the decomposition reaction.

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Section: Physicochemical Properties Of Catalystsmentioning

confidence: 59%

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

et al. 2019

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“…The estimated lattice constant decreases in the case of Dy 3+ ion doped in Ca 3 Bi(PO 4 ) 3 host lattice as compared with the un‐doped sample. The decrease in lattice constant can be attributed to compression in unit cell volume due to the substitution of smaller ionic radii of Dy 3+ ions at the place of larger Bi 3+ ions in the host lattice . In the XRD patterns, full‐width at half‐maximum (FWHM) and Braggs diffraction angle can be used to estimate the crystallite size of the powder sample.…”

Section: Resultsmentioning

confidence: 99%

“…The decrease in lattice constant can be attributed to compression in unit cell volume due to the substitution of smaller ionic radii of Dy 3+ ions at the place of larger Bi 3+ ions in the host lattice. 38 In the XRD patterns, full-width at half-maximum (FWHM) and Braggs diffraction angle can be used to estimate the crystallite size of the powder sample. The crystallite size was determined by using the Debye-Scherrer formula 39,40 :…”

Section: X-ray Diffraction and Structural Analysismentioning

confidence: 99%

White light emitting thermally stable bismuth phosphate phosphor Ca₃Bi(PO₄)₃:Dy³⁺ for solid‐state lighting applications

Sahu

Jayasimhadri

2019

J Am Ceram Soc

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White light emitting dysprosium‐doped Ca3Bi(PO4)3 phosphor was successfully synthesized via co‐precipitation method for the first time and the structural, vibrational, morphological, and luminescent properties have been investigated for solid‐state lighting applications. X‐ray diffraction (XRD) and structural refinement studies reveal that the synthesized phosphors consist of single phase with cubic structure. The field emission scanning electron microscopy (FE‐SEM) images reveal that the as‐synthesized phosphor has micron size particle with an irregular shape. Under near‐ultraviolet (n‐UV) and blue excitation, the phosphor exhibits white light emission via a combination of blue (~484 nm) and yellow (~575 nm) emission bands. The optimized concentration of Dy3+ ions is 6.0 mol % after which the concentration quenching takes place. The process of energy transfer between Dy3+ ions is due to dipole‐dipole interaction, which was confirmed by applying Dexter's theory. The CIE chromaticity coordinates for the optimized phosphor were (0.329, 0.377), and they lie in the white light region. The emission intensity remains to be 83.41% at 373 K to that of at room temperature, which indicates good thermal stability. The above mentioned results demonstrate that Ca3Bi(PO4)3 is a potential phosphor for solid‐state lighting applications.

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“…In the case where foreign atoms are incorporated into interstitial sites and not as substitutional ions instead of Zn 2+ , a peak shi toward lower angles was reported. 11,27 Detailed studies performed on Aldoped ZnO demonstrated that Al is found in both substitutional and interstitial sites, 28,29 whereas Ti is found as interstitial. 27 The atomic radii of the dopants (206 pm for Zr, 193 pm for W, 176 pm for Ti and 161 pm for Mn) are all larger than that of Zn (135 pm), with the exception of Al (118 pm).…”

Section: Xrd-measurementsmentioning

confidence: 99%

Strong Volta potential change in doped zinc oxide as a photoresponse to UV irradiation

Huber

Mardare

et al. 2019

RSC Adv.

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Site location of Al-dopant in ZnO lattice by exploiting the structural and optical characterisation of ZnO:Al thin films

Cited by 138 publications

References 24 publications

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

White light emitting thermally stable bismuth phosphate phosphor Ca₃Bi(PO₄)₃:Dy³⁺ for solid‐state lighting applications

Strong Volta potential change in doped zinc oxide as a photoresponse to UV irradiation

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Site location of Al-dopant in ZnO lattice by exploiting the structural and optical characterisation of ZnO:Al thin films

Cited by 138 publications

References 24 publications

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

White light emitting thermally stable bismuth phosphate phosphor Ca3Bi(PO4)3:Dy3+ for solid‐state lighting applications

Strong Volta potential change in doped zinc oxide as a photoresponse to UV irradiation

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Resources

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White light emitting thermally stable bismuth phosphate phosphor Ca₃Bi(PO₄)₃:Dy³⁺ for solid‐state lighting applications