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Studying physical properties of selenium such as structural, optical, electrical, dielectric properties of selenium films and their behavior to various external agents are of importance from basic research and technical points of view, an issue that still demands further work despite the vast number of literature studies being conducted on different forms of selenium (amorphous, poly-crystalline, and crystalline specimens).
There are several approaches to analyze transmittance data of selenium films, from which one can extract their optical constants and other related topics.<ref>{{Cite journal|last=Jafar|first=Mousa M. Abdul-Gader|last2=Saleh|first2=Mahmoud H.|last3=Ahmad|first3=Mais Jamil A.|last4=Bulos|first4=Basim N.|last5=Al-Daraghmeh|first5=Tariq M.|date=2016-04-01|title=Retrieval of optical constants of undoped amorphous selenium films from an analysis of their normal-incidence transmittance spectra using numeric PUMA method|url=https://link.springer.com/article/10.1007/s10854-015-4156-z|journal=Journal of Materials Science: Materials in Electronics|language=en|volume=27|issue=4|pages=3281–3291|doi=10.1007/s10854-015-4156-z|issn=0957-4522}}</ref>
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Stoichiometric films of selenium-based alloys such as those of Bi-Se and Bi-Te composites are of technical importance for applications in memory switch devices. Thermoanalytical studies often give information about their stoichiometry, melting/boiling points and kinetic reactions responsible for their decomposition and crystallization. A preliminary thermoanalytical study on Bi-Se composites were conducted via thermogravimetry (TG) and differential thermogravimetry (DTG) experiments using a single heating rate and analyzing the measured non-isothermal TG and DTG curves via model-based kinetic reaction formulas of original Coats-Redfern (CR) and Achar-Brindley-Sharp (ABS) equations, as described in the following paper, though it is always preferable to analyze such TG and DTG data on the basis of model-free kinetic reaction formulations and several heating rates.<ref>{{Cite journal|last=Ahmad|first=Mais Jamil A.|last2=Jafar|first2=Mousa M. Abdul-Gader|last3=Saleh|first3=Mahmoud H.|last4=Shehadeh|first4=Khawla M.|last5=Telfah|first5=Ahmad|last6=Ziq|first6=Khalil A.|date=2017-09-30|title=Evaluation of Kinetic Parameters and Thermal Stability of Melt-Quenched Bi<sub>x</sub>Se<sub>100−x</sub> Alloys (x ≤7.5 at%) by Non-Isothermal Thermogravimetric Analysis|url=http://www.appmicro.org/journal/view.html?uid=223&&vmd=Full|journal=Applied Microscopy|language=en|volume=47|issue=3|doi=10.9729/AM.2017.47.3.110|issn=2287-5123}}</ref>
A number of studies were carried out on undoped amorphous and crystalline selenium films, in which their structure and electric/dielectric properties/data have been also investigated and analyzed,
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