Influence of Mg2+-substitution on the optical band gap energy of Cr2−Mg O3 nanoparticles

Singh, Jarnail; Verma, Vikram; Kumar, Rajesh; Kumar, Ravi

doi:10.1016/j.rinp.2019.02.042

Cited by 28 publications

(10 citation statements)

References 33 publications

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“…The slope of the best-fitted line provides E U as 0.056 eV. Urbach suggested another formula in which the absorption coefficient ( α ) depends on the transition energy ( E 0 ), pre-exponential constant ( β ), incident photon energy ( hν ), and transition temperature (∼298 K) as, 47 …”

Section: Resultsmentioning

confidence: 99%

First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals

Giri

Chaki

Dave³

et al. 2023

Mater. Adv.

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Section: Resultsmentioning

confidence: 99%

First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals

Giri

Chaki

Dave³

et al. 2023

Mater. Adv.

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“…ese values are also higher and evident by the presence of impurities within these samples. e value of Urbach energy for Black tourmaline might belong to the Mg contents present in this sample as it is recently reported by Singh et al [28] that the sample containing the 50% contents of Mg+2 has the value of Urbach energy to 0.46 eV. e values of Urbach energy for Amethyst might be due to the Ca.…”

Section: Journal Of Spectroscopymentioning

confidence: 55%

Spectroscopic Analysis for Harnessing the Quality and Potential of Gemstones for Small and Medium-Sized Enterprises (SMEs)

Ahmad

Serbaya

Rizwan

et al. 2021

Journal of Spectroscopy

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Introduction of modern technologies and methods and quality analysis for the gemstone industry are the main strategic initiatives of the Small and Medium Development Authority (SMEDA) of Pakistan. In this regard, four natural gemstones Quartz, Pyrope-Almandine Garnet, Black tourmaline, and Amethyst brought from Hunza valley Pakistan were analyzed by state-of-the-art spectroscopic techniques including EDX, UV-VIS, and FTIR spectroscopy. EDX revealed the traces of Fe, Mg, and Ca in Pyrope-Almandine garnet, Mg and Fe in Black tourmaline, Au and Ca in Amethyst. UV-VIS data revealed the values of Urbach energies 520, 210, 460, and 430 meV, and the values of direct bandgap energies 5.14, 6.12, 5.54, 5.74 eV, respectively. The higher structural disorder due to the presence of Fe and other impurities in stones except Quartz was attributed to the higher values of Urbach energies and decrease in band gaps: FTIR data Fe-O and Si-O stretching vibration in Pyrope-Almandine garnet, Si-O bending vibrations and O-H stretching vibration in Quartz, Si-O-Si bending and stretching vibrations and C=O stretching vibrations in Black tourmaline, Ca-O stretching vibrations and Si-OH weak-vibrations in Amethyst. Photoluminescence results also showed useful information in investigating the properties of gemstones.

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“…An increment in defects leads to an extension of energy levels from the band edge into the forbidden energy gap that broadens the band tail. The broadening in the Urbach band tail is responsible for the higher E u values [21,53]. Widening at the edge of the Urbach tail is attributed to an increment in compositional disorders [11].…”

Section: Uv-visible Absorption Studiesmentioning

confidence: 98%

“…From relations (1) and (2), the value of the steepness parameter can be evaluated to represent in the following form: σ = K B T/E u [19,21]. The value of σ is inversely related to a parameter named electron-phonon interaction strength (E e-p ) and is expressed as [21]:…”

Section: Uv-visible Absorption Studiesmentioning

confidence: 99%

Tuning the electron–phonon interaction via exploring the interrelation between Urbach energy and fano-type asymmetric raman line shape in GO-hBN nanocomposites

Yadav,

Mohanty

2023

Nanotechnology

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Hexagonal boron nitride (hBN), having an in-plane hexagonal structure in the sp2 arrangement of atoms, proclaims structural similarity with graphene with only a small lattice mismatch. Despite having nearly identical atomic arrangements and exhibiting almost identical properties, the electronic structures of the two materials are fundamentally different. Considering the aforementioned condition, a new hybrid material with enhanced properties can be evolved by combining both materials. This experiment involves liquid phase exfoliation of hBN and two-dimensional nanocomposites of GO-hBN with varying hBN and graphene oxide (GO) ratios. The optical and vibrational studies conducted using UV–vis absorption and Raman spectroscopic analysis report the tuning of electron–phonon interaction (EPI) in the GO-hBN nanocomposite as a function of GO content (%). This interaction depends on disorder-induced electronic and vibrational modifications addressed by Urbach energy (E u ) and asymmetry parameter (q), respectively. The EPI contribution to the induced disorders estimated from UV–vis absorption spectra is represented as EPI strength (E e–p ) and its impact observed in Raman phonon modes is quantified as an asymmetry parameter (q). The inverse of the asymmetry parameter is related to E e–p , as E e–p ∼ 1/|q|. Here in this article, a linear relationship has been established between E u and the proportional parameter (k), where k is determined as the ratio of the intensity of specific Raman mode (I) and q 2, explaining the disorders’ effect on Raman line shape. Thus a correlation between Urbach energy and the asymmetry parameter of Raman mode confirms the tuning of EPI with GO content (%) in GO-hBN nanocomposite.

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Influence of Mg2+-substitution on the optical band gap energy of Cr2−Mg O3 nanoparticles

Cited by 28 publications

References 33 publications

First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals

First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals

Spectroscopic Analysis for Harnessing the Quality and Potential of Gemstones for Small and Medium-Sized Enterprises (SMEs)

Tuning the electron–phonon interaction via exploring the interrelation between Urbach energy and fano-type asymmetric raman line shape in GO-hBN nanocomposites

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Influence of Mg2+-substitution on the optical band gap energy of Cr2−Mg O3 nanoparticles

Cited by 28 publications

References 33 publications

First principle insights and experimental investigations of the electronic and optical properties of CuInS2 single crystals

First principle insights and experimental investigations of the electronic and optical properties of CuInS2 single crystals

Spectroscopic Analysis for Harnessing the Quality and Potential of Gemstones for Small and Medium-Sized Enterprises (SMEs)

Tuning the electron–phonon interaction via exploring the interrelation between Urbach energy and fano-type asymmetric raman line shape in GO-hBN nanocomposites

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First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals

First principle insights and experimental investigations of the electronic and optical properties of CuInS₂ single crystals