Optical and dielectric studies of CdI 2 -doped silver borotelurate glass system
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Optical and dielectric studies of CdI2-doped silver borotelurate glass system Puli Nageswar Rao1,* , M. Chandra Shekhar Reddy2, A. Prabhakar Reddy3, E. Ramesh Kumar4, and B. Appa Rao4 1
Department Department 3 Department 4 Department 2
of of of of
S&H, St. Martin’s Engineering College, Secunderabad 500100, India S&H, CMR College of Engineering & Technology, Secunderabad, India H&S, Sreyas Institute of Engineering & Technology, Hyderabad, India Physics, Osmania University, Hyderabad 500 007, India
Received: 10 July 2020
ABSTRACT
Accepted: 9 November 2020
This paper treaty with the preparation, characterization, and Optical and Dielectric studies of xCdI2–(100 - x)[0.444 Ag2SO4–0.555 (0.4TeO2–0.6B2O3) glass system, where x is the wt% of CdI2 varying from 0 to 25 with step 5. These systems were prepared by melt quenching method and characterized by Differential scanning calorimeter (DSC), X-ray diffraction (XRD), and Fourier transforms infrared (FTIR) spectra. Physical parameters such as the density of materials, molar volume, average molecular weight, refractive index, oxygen mole present, polarizability, field strength, and Cd and Ag ions concentration were calculated. Based on optical absorption results, direct band gap Eg was premeditated by comparing Tauc’s plots and the ASF method. From these optical absorption results, Urbach energy (Eu) also calculated. Second-order deformation potential and free energy of the system have been resoluted by expending relation between Eu and Eg. Variation of these factors by changing the CdI2 composition is deliberated in detail. Refractive index, dielectric constant at optical and electrical frequencies have been discussed in detail.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In recent years, silver-doped borotellurite glass and glass–ceramics have abundant attention because of its valuable high value of ionic, dielectric, and optical properties. These types of materials are of technical and industrial interest in view of their applications including fuel cells, optical switches, biosensors, primary batteries, etc. [1–4]. So many studies
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https://doi.org/10.1007/s10854-020-04859-6
evidenced that the glassy nature of the substances exhibits valuable optical properties and higher dielectric properties than their corresponding crystalline equivalents. The optical, structural, and electrical properties depend on the content and glass former nature, modifier oxide, and also dopant salt compositions [1–4]. Pure borotellurite glasses are concocted of a random network of boroxyl structural units through boron in threefold co-ordination (BO3)
J Mater Sci: Mater Electron
and arbitrary network of telluride units through tellurium in twofold co-ordination (TeO2). The accumulation of dopant salt and modifier leads the creation of BO4, TeO3, TeO4 clusters and formation of non-bridging oxygen. The rise of formation of nonbridging oxygen benefits to open the network arrangement an
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