Tunable indirect to direct band gap transition of Fe2TaX (X=Al and Ga) Heusler alloy under hydrostatic pressure effect

We hereby are reporting the transition pressure at which lithium fluoride ( LiF ) compound transforms from direct band gap to indirect band gap insulator on the basis of FP-LAPW calculations. The fundamental band gap of LiF compound suffers direct to indirect transition at a pressure of 70 GPa. The study of the pressure effect on the optical properties e.g. dielectric function, reflectivity, refractive index and optical conductivity of LiF in the pressure between 0–100 GPa, shows that this pressure range is very critical for LiF compound as there are significant changes in the optical properties of this compound.

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Hydrostatic-pressure coefficient of the direct band-gap energy ofAlxGa1−xAsforx=0−0.35

Physical Review B ◽

10.1103/physrevb.53.10916 ◽

1996 ◽

Vol 53 (16) ◽

pp. 10916-10920 ◽

Cited By ~ 9

Author(s):

Hyeonsik M. Cheong ◽

J. H. Burnett ◽

W. Paul ◽

P. F. Hopkins ◽

K. Campman ◽

...

Keyword(s):

Hydrostatic Pressure ◽

Band Gap ◽

Pressure Coefficient ◽

Band Gap Energy ◽

Direct Band Gap ◽

Gap Energy ◽

Direct Band

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Direct band-gap measurement on epitaxial Co2FeAl0.5Si0.5 Heusler-alloy films

Journal of Applied Physics ◽

10.1063/1.4916817 ◽

2015 ◽

Vol 117 (17) ◽

pp. 17D131 ◽

Cited By ~ 3

Author(s):

Tariq F. Alhuwaymel ◽

Robert Carpenter ◽

Chris Nga Tung Yu ◽

Balati Kuerbanjiang ◽

Ranjdar M. Abdullah ◽

...

Keyword(s):

Band Gap ◽

Heusler Alloy ◽

Alloy Films ◽

Direct Band Gap ◽

Gap Measurement ◽

Direct Band

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Development of Direct Band Gap Group IV Semiconductors with the Incorporation of Sn

10.21236/ada558773 ◽

2012 ◽

Author(s):

Hung Hsiang Cheng

Keyword(s):

Band Gap ◽

Group Iv ◽

Direct Band Gap ◽

Group Iv Semiconductors ◽

Direct Band

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Analysis of Direct Band Gap A2ScInI6 (A=Rb, Cs) Double Perovskite Halides Using DFT Approach for Renewable Energy Devices

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2021.05.080 ◽

2021 ◽

Author(s):

N.A. Noor ◽

M. Waqas Iqbal ◽

Taharh Zelai ◽

Asif Mahmood ◽

H.M. Shaikh ◽

...

Keyword(s):

Renewable Energy ◽

Band Gap ◽

Double Perovskite ◽

Energy Devices ◽

Direct Band Gap ◽

Direct Band

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Optical Studies of Poly (N-Carbazole) (PVK) Blending with Polyvinylpyrrolidone (PVP) Using Tauc/Davis-Mott Model

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.527 ◽

2013 ◽

Vol 652-654 ◽

pp. 527-531 ◽

Cited By ~ 1

Author(s):

A.N. Alias ◽

T.I. Tunku Kudin ◽

Z.M. Zabidi ◽

M.K. Harun ◽

Ab Malik Marwan Ali ◽

...

Keyword(s):

Band Gap ◽

Urbach Energy ◽

Quartz Substrate ◽

Optical Studies ◽

Direct Band Gap ◽

Mott Model ◽

Blended Polymer ◽

Electronic Parameters ◽

Direct Band ◽

Indirect Band Gap

The optical absorption spectra of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) in various compositions are investigated. A doctor blade technique was used to coat the blended polymer on a quartz substrate. The electronic parameters such as absorption edge (Ee), allowed direct band gap (Ed), allowed indirect band gap (Ei), Urbach edge (Eu) and steepness parameter (γ) were calculated using Tauc/Davis-Mott Model. The results reveal that the Ee, Ed and Ei increase with increasing of PVP ratio. There also have variation changing in Urbach energy and steepness parameter.

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