There are several approaches to analyze transmittance data of selenium films, from which one can extract their optical constants and other related topics.[1]
However, the algebraic method of Swanepoel seems to be trustful and need no dispersion relations in prior, but is limited to transmittance spectra that display a number of peaks (maxima and minima).[2]
The following paper deals with conventional curve-fitting of the transmittance data, an approach that depends on the availability of proper dispersion formulas to be inserted in the program.[3]
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.
References
- ^ Jafar, Mousa M. Abdul-Gader; Saleh, Mahmoud H.; Ahmad, Mais Jamil A.; Bulos, Basim N.; Al-Daraghmeh, Tariq M. (2016-04-01). "Retrieval of optical constants of undoped amorphous selenium films from an analysis of their normal-incidence transmittance spectra using numeric PUMA method". Journal of Materials Science: Materials in Electronics. 27 (4): 3281–3291. doi:10.1007/s10854-015-4156-z. ISSN 0957-4522.
- ^ Saleh, Mahmoud H.; Ershaidat, Nidal M.; Ahmad, Mais Jamil A.; Bulos, Basim N.; Jafar, Mousa M. Abdul-Gader (2017-06-01). "Evaluation of spectral dispersion of optical constants of a-Se films from their normal-incidence transmittance spectra using Swanepoel algebraic envelope approach". Optical Review. 24 (3): 260–277. doi:10.1007/s10043-017-0311-5. ISSN 1340-6000.
- ^ Saleh, Mahmoud H.; Jafar, Mousa M. Abdul-Gader; Bulos, Basim N.; Al-Daraghmeh, Tariq M. F. (2014-10-21). "Determination of Optical Properties of Undoped Amorphous Selenium (a-Se) Films by Dielectric Modeling of Their Normal-Incidence Transmittance Spectra". Applied Physics Research. 6 (6): 10. doi:10.5539/apr.v6n6p10. ISSN 1916-9647.