tailieunhanh - Investigation on structure of TeO2-B2O3-SiO2-Al2O3-KF glasses

Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer (DTA) measurements. | VNU Journal of Science Mathematics Physics Vol. 36 No. 2 2020 23-30 Original Article Investigation on Structure of TeO2-B2O3-SiO2-Al2O3-KF Glasses Phan Van Do Thuy Loi University 175 Tay Son Dong Da Hanoi Vietnam Received 29 October 2019 Revised 06 November 2019 Accepted 05 March 2020 Abstract Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction XRD patterns. Effect of B 2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy FTIR spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer DTA measurements. 1. Introduction In recent decades there has been an increasing attraction in synthesis and studies of structural and physical properties of heavy metal oxide glasses due to their diversity applications in optical field 1- 3 . Among these glasses tellurite glasses are technologically and scientifically important due to their outstanding properties such as low phonon energy high refractive index high dielectric constant good infrared transmittance low glass transition and melting temperature thermal and chemical stability and high crystallization resistance 4-6 . Because of these features tellurite glasses have become the promising materials for practical applications such as laser upconversion optical data storage sensors and wave guide ect 5-7 . However due to the recrystallization of TeO2 the pure tellurium oxide glasses can not be successfully fabricated by using the traditional melting method. Brady 4 has shown that adding more than 10 modifiers like Na2O Al2O3 K2O or B2O3 is necessary to avoid recrystallization when the TeO2 glass is fabricated by using a general glass making process. It is noted that boric oxide B2O3 is one of the representative glass forming oxides and flux material 7 . In ________ Corresponding .

• Toán học
• Borotellurite glasses
• Melt quenching technique
• Confirmed through X ray diffraction
• Fourier transform infrared spectroscopy
• Differential thermal analyzer