Shift of band gap from indirect to direct and optical response of CaO by doping S, Se, Te

Naeemullah,; Murtaza, G.; Khenata, R.; Safeer, Affan; Alahmed, Z. A.; Omran, S. Bin

doi:10.1016/j.commatsci.2014.04.039

Cited by 23 publications

(6 citation statements)

References 37 publications

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“…There have been a large number of research papers related to MgO [6][7][8][9][10][11][12] and CaO [12][13][14][15][16][17][18][19][20]. Duffy et al [6] have found that MgO is stable in the B1 (NaCl) phase up to 230 GPa by experiment.…”

Section: Introductionmentioning

confidence: 96%

“…Speziale et al [18] have studied the high pressure elasticity of CaO up to 25.2 GPa and 65.2 GPa by the single crystal Brillouin scattering and the X-ray diffraction method, respectively. Naeemullah et al [19] have also calculated structural, electronic and optical properties of CaO 1 À x S x (x ¼0.25, 0.50, 0.75; S¼S, Se, Te). Baltache et al [20] have analyzed the structural, elastic and electronic properties of the three alkaline earth oxides, namely MgO, CaO and SrO by using the FP-LAPW method.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Mechanical and electronic properties of Ca1−Mg O alloys

Fan

Chai

Wei

et al. 2015

Materials Science in Semiconductor Processing

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Mechanical and electronic properties of Ca1−Mg O alloys

Fan

Chai

Wei

et al. 2015

Materials Science in Semiconductor Processing

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“…Results of diffuse reflectance spectra (see Fig. 4 and Table 2) to the CaO, CaTiO 3 , and CaO/CaTiO 3 /CaCO 3 /Ca(OH) 2 samples showed a direct band gap energy by the Kubelka-Munk algorithm [32,33,[40][41][42]. Heterojunctions showed lower band gap energy with increasing CaTiO 3 concentration.…”

Section: Resultsmentioning

confidence: 99%

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

et al. 2020

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In this work a new semiconductor based on calcium heterojunction (CaO/CaTiO 3 ) was evaluated to the optical properties correlated to crystalline lattice defects. The heterojunctions of the semiconductor were prepared by the sol-gel route and its formation was confirmed by the intimate contact interface between crystalline phases. Morphology and elemental composition of the nanometric heterojunction were evaluated. Chemical environment and composition of the surface were used to determine the oxidation state of the material constituents. The electronic structure was evaluated and the relationship among band gap energy, photoluminescent emission energy, and photocatalytic activity of the materials was demonstrated. Oxygen vacancies located on the surface promoted photoluminescent spectra emission in the green wavelength, making them more photoactive than those defects that emitted in the red region. The use of active species scavenger indicated that the photogenerated species with the greatest photocatalytic action was the superoxide radical. This study has developed calcium heterojunctions for application as photocatalysts, demonstrating the importance of the defects generated in the production of heterojunctions and the activity of photogenerated species, studied using scavengers.

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“…These alkaline earthsulfide compounds, which are widely present in the mantle, have extensive applications in various industrial fields, such as luminescent devices, microelectronics, catalysis, and magnetooptical devices. [18][19][20] Experimental and theoretical studies on these compounds have been extensively conducted in academia. According to reports, as early as 1994, researchers discovered through synchrotron X-ray diffraction techniques that chalcogenide compounds generally undergo structural transformations from the sixfold-coordinated B1 structure to the eightfold-coordinated B2 structure under pressure.…”

Section: Introductionmentioning

confidence: 99%