2009
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PublicationArticle Composition dependence of UV-visible and MID-FTIR properties of Se98-xZn2Inx (x = 0, 2, 4, 6 and 10) chalcogenide glasses(2009) Abhay Kumar Singh; Kedar SinghThe UV-VIS absorption spectra of thin film of Se98-xZn2Inx (x = 0, 2, 4, 6 and 10) chalcogenide glasses were measured in the wavelength range of 200-1100 nm by using spectrophotometer. It is observed from UV-VIS absorption measurements that the optical energy gap (Eg) decreases with In content and it found a minimum for the Se92Zn2In6 system. The refractive index (n), extinction coefficient (k), real dielectric constant (') imaginary dielectric constant (''), absorption coefficient () are evaluated maximum for the Se92Zn2In6 composition. However, FTIR spectra were recorded in the wavenumber range 4000-400 cm-1. The FTIR recorded spectrum was shown to be a broad spectrum with increasing transmission in the MID (6-25 m) infrared region. The MID-IR spectrum transmittance percentage was also found to be considerably high for the Se92Zn2In6 system. © 2009 Taylor & Francis.PublicationArticle Correlation between Meyer-Neldel rule and phase separation in Se98-xZn2Inx chalcogenide glasses(2009) Abhay Kumar Singh; Neeraj Mehta; Kedar SinghThe present work reports the observation of Meyer-Neldel rule for the thermally activated crystallization of glassy Se98-xZn2Inx (0 ≤ x ≤ 10) alloys. We have observed a strong co-relation between the pre-exponential factor K0 of rate constant K(T) of crystallization and activation energy of crystallization Ec in the present case. This indicates the presence of compensation effect for the non-isothermal crystallization process in the present glassy system, which is explained in terms of phase separation of the present alloys due to flaw bonds of these amorphous solids. © 2008 Elsevier B.V. All rights reserved.PublicationArticle Optical and FTIR properties of Se93-XZn2Te5InX chalcogenide glasses(2009) Abhay Kumar Singh; Neearj Mehta; Kedar SinghIn this work, we report the optical properties of bulk Se93-XZn2Te5InX (X=0, 2, 4, 6 and 10) chalcogenide glasses. Refractive index, extinction coefficient, real dielectric constant (ε′), imaginary dielectric constant (ε″), absorption coefficient (α) and energy band gap were obtained from analysis of common range (250-1100 nm) UV/Visible transmittance spectrum. Besides, transmission percentages were obtained from FTIR spectra in wave number range 4000-400 cm-1.The concentration dependence structural phenomena have been explained with help of average coordination 〈z〉. © 2009 Elsevier B.V. All rights reserved.