Precise Determination of Band Gap Naturally via Absorption/Reflectance/Transmission Spectra

2014 ◽  
Vol 509 ◽  
pp. 3-8 ◽  
Author(s):  
Ya Jie Liu ◽  
Ning Zhu
Keyword(s):  
Experimental Data ◽  
Band Gap ◽  
Material Property ◽  
Calculated Data ◽  
Precise Determination ◽  
Transmission Spectra ◽  
Spectroscopy Data ◽  
Reflection And Transmission ◽  
Experimental Spectroscopy

A set of nonlinear equations about the band gap and the indexnof material property with the absorptance, reflectance and transmittance were produced based on Tauc relation. Optimizing fitting the experimental spectroscopy data, such as absorption, reflection and transmission, the band gapand the indexnrelated to the material property could be obtained accurately and reliably. Meanwhile, the experimental data were used as more as possible, and the artificial errors at pre-determining the indexnwere avoided. The lowest correlation coefficient and the largest average relative error between the experimental and the calculated data are 0.9588 and 2.7% in all considered cases respectively. The best results show the band gap obtained from this method is more accurate, easier and faster than traditional extrapolation. Hence, this work would promote the precision and reliability for predicting the band gap and index of materials naturally.

Precise Determination of the Direct–Indirect Band Gap Energy Crossover Composition in AlxGa1-xAs

2013 ◽  
Vol 6 (7) ◽  
pp. 071201 ◽  
Author(s):  
Daniel A. Beaton ◽  
Kirstin Alberi ◽  
Brian Fluegel ◽  
Angelo Mascarenhas ◽  
John L. Reno
Keyword(s):  
Band Gap ◽  
Band Gap Energy ◽  
Precise Determination ◽  
Gap Energy ◽  
Indirect Band Gap

EVALUATION OF THE STRESSED DEFORMED STATE OF MAIN GAS PIPELINES RUNNING IN PERMANENTLY FROZEN GROUNDS

2020 ◽  
pp. 58-63
Author(s):  
M. M. Sidorov ◽  
N. I. Golikov ◽  
R. P. Tihonov
Keyword(s):  
Experimental Data ◽  
Calculated Data ◽  
Gas Pipeline ◽  
Loss Of Stability ◽  
Portable Equipment ◽  
Ray Method ◽  
X Ray ◽  
Deformed State ◽  
Pipeline Monitoring

The work evaluates the stress deformed state of the section of the interfield gas collecting main, running in permanently frozen grounds. The object of research is a section of a pipeline with an arched discharge formed as a result of loss of stability as a result of thermal erosion of permanently frozen grounds to disturbance of the vegetation cover. The determination of stresses was carried out by the X-ray method using portable equipment. The experimental data were analyzed with the calculated. The calculated data were obtained by measuring the spatial position of the gas pipeline section. The obtained values of the acting stresses and the estimates of the critical indicators of the gas pipeline monitoring section made it possible to reasonably estimate the stress state. The methodology for determining the acting stresses of pipelines using portable X-ray equipment can be successfully applied to estimate the stressed-deformed state of pipeline systems running in the zone of permafrost.

Precise determination of optical band gap in Cr-doped semiconductor nanowires

2022 ◽  
Vol 54 (2) ◽  
Author(s):  
Noori S. Anad ◽  
Zakaria M. Abd El-Fattah ◽  
M. Attallah ◽  
Hanaa M. Ahmed ◽  
M. M. El-Okr ◽  
...  
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Semiconductor Nanowires ◽  
Precise Determination

scholarly journals Relaxed micromorphic modeling of the interface between a homogeneous solid and a band-gap metamaterial: New perspectives towards metastructural design

2017 ◽  
Vol 23 (12) ◽  
pp. 1485-1506 ◽  
Author(s):  
Angela Madeo ◽  
Gabriele Barbagallo ◽  
Manuel Collet ◽  
Marco Valerio d’Agostino ◽  
Marco Miniaci ◽  
...  
Keyword(s):  
Band Gap ◽  
Excellent Agreement ◽  
Continuum Model ◽  
Fem Simulation ◽  
Transmission Spectra ◽  
Reflection And Transmission ◽  
Indirect Measure ◽  
Material Parameters ◽  
Transmission Coefficients ◽  
Transmission Properties

In the present paper, the material parameters of the isotropic relaxed micromorphic model derived for a specific metamaterial in a previous contribution are used to model its transmission properties. Specifically, the reflection and transmission coefficients at an interface between a homogeneous solid and the chosen metamaterial are analyzed by using both the relaxed micromorphic model and a direct FEM implementation of the detailed microstructure. The obtained results show excellent agreement between the transmission spectra derived via our enriched continuum model and those issued by the direct FEM simulation. Such excellent agreement validates the indirect measure of the material parameters and opens the way towards an efficient metastructural design.

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