Silver oxide embedded alkali zinc boro tellurite glasses: Physical, structural and optical properties for possible optical switching applications
Vinay Dole, S. N., B. P. Siddalingeshwara, Meher Taj S, D. R. Rangaswamy, Ashok Kumar Reddy, C Devaraja
Abstract
• The melt-quenching technique method was used to produce the BTZNA set of Glasses. • FTIR spectra and deconvoluted FTIR spectra explores the impact of addition of Ag 2 O on structural changes due to the interconversion of BO 4 and BO 3 units was noticed by to the ZnO-B 2 O 3 -TeO 2 Na 2 O glasses which causes. • The presence of TeO 3+1 (polyhedral) and TeO 3 (trigonal pyramid) units, Zn-O vibrations of ZnO 4 units found by FTIR. • The refractive index values of BTZNA glasess shows increasing tendency with increasing Ag 2 O concentration. • The decreasing propensity of the metallization criterion values shows the BTZNA glasses are less insulating. A new set of alkali zinc boro tellurite glasses activated with silver oxide was prepared by the melt quenching method to investigate their suitability for significant applications in optical switching and optical device applications. The XRD is carried out to check the non-crystalline nature of the BTZNA glasses. The impact of the addition of Ag 2 O to the ZnO-B 2 O 3 -TeO 2 Na 2 O glasses causes structural changes due to the interconversion of BO 4 and BO 3 units, which was noticed by FTIR and deconvoluted FTIR spectra, and FTIR is also evidence of the presence of TeO 3+1 (polyhedral) and TeO 3 (trigonal pyramid) units, Zn-O vibrations of ZnO 4 units. Physical properties such as density, molar volume, polaron radius, and oxygen packing density were determined by using a suitable mathematical approach. The optical absorption of BTZNA glasses was performed by using UV–visible spectroscopy, and hence, important optical properties of the glasses like direct and indirect energy band gaps, Urbach energy, refractive index, metallization criterion, and optical basicity are calculated. The highest RI is observed as 2.222 for BTNAZ2 glasses. The indirect energy band gap of prepared glasses ranges from 3.22 eV to 3.26 eV. The observed physical, structural, and optical properties of the glasses show these glasses are potentially good materials for optical material and optical switching applications.