Structure‐terahertz property relationship in sodium borosilicate glasses

Abstract

We report, for the first time, an early evidence of structure‐terahertz (THz) property relationship for two tie‐lines within the sodium borosilicate glass system. The NaBSi series was chosen to study the effect of the substitution of silicon dioxide for boron oxide, whereas the BNaSi series studies the substitution of silicon dioxide for sodium oxide. Nuclear magnetic resonance, infrared absorption, and Raman spectroscopies were used to determine structural changes across both series. THz time‐domain spectroscopy was used to record the refractive index over the measured bandwidth. Individual measurements at .502 THz were used as a frequency of focus for comparisons. The foundation for the proposed structure‐THz property relationship is based on higher measurable THz refractive index changes correlated to a depolymerized glass network, R > .5, a network consisting of SiO4 tetrahedra and charge‐deficient [BØ4]− tetrahedra‐forming borosilicate danburite and reedmergnerite rings with mixed Si–O–B bridges, and the formation of nonbridging oxygen (nbO) atoms on silicate tetrahedra. A polymerized glass network, R < .5, consists of homonuclear boroxol and silica rings within sodium borate and silicate subnetworks. Calculated and experimental fractions of tetrahedral borate and silicate tetrahedra with one nbO, optical basicity, density, and network connectivity data support the structure‐THz property relationship.

Universal power-law of terahertz optical properties of borosilicate, tellurite, and chalcogenide glass families

“…Borosilicate, tellurite, and chalcogenide glasses were produced, with compositions shown in Table 1, and discussed in detail elsewhere [22][23][24] . Structural studies have been carried out to provide a comprehensive description of each glass systems structure through Raman spectroscopy, and additional spectroscopies, seen in previous work [22][23][24] .…”

“…Borosilicate, tellurite, and chalcogenide glasses were produced, with compositions shown in Table 1, and discussed in detail elsewhere [22][23][24] . Structural studies have been carried out to provide a comprehensive description of each glass systems structure through Raman spectroscopy, and additional spectroscopies, seen in previous work [22][23][24] . The sodium borosilicate glass system was selected within the borosilicate glass family, ultimately studying two tie line, NaBSi and BNaSi, series, studying the replacement of SiO 2 for B 2 O 3 with constant Na 2 O at 20 mol% and SiO 2 for Na 2 O with constant B 2 O 3 at 20 mol%, respectively.…”

“…We have performed in-depth structural studies for all three glass families, while also reporting THz refractive indices across the measured THz bandwidth, ultimately resulting in structure-THz property relationships for the borosilicate, tellurite, and chalcogenide glass families. We suggest the readers review our previous works for structure-THz property relationship, i.e., in-depth structural and THz study, of each glass family [22][23][24] . THz-TDS has been used to study the refractive index and absorption coefficient at THz frequencies of select compositions within various glass families and how it can be used in glass science and engineering as a nondestructive characterization technique 25 .…”

Effect of femtosecond laser irradiation on structure‐terahertz property relationship in sodium borosilicate glasses

“…We have recently reviewed and provided early insight on structure-THz property relationship for borosilicate, tellurite, and chalcogenide glass families. 2,16,17 The borosilicate and chalcogenide glass systems studies have been extended to discuss the visible-THz refractive index correlation and long-wave infrared-THz refractive index correlation and the effect of femtosecond laser irradiation, respectively. 17,18 THz-TDS has been used to study optical properties of various glass families with select compositions and its application in glass science as a nondestructive characterization technique.…”

“…A more detailed discussion of borosilicate glass structure and network, along with indepth description of THz spectroscopy and data analysis, is reported elsewhere. 2 We have obtained structural information across each compositional series using nuclear magnetic resonance (NMR), infrared absorption, and Raman spectroscopies. We have used the THz-TDS to determine the refractive index within the THz regime, with a focus on the refractive index at 0.502 THz.…”