TY - JOUR
T1 - Complex refractive index of silica, silicate, borosilicate, and boroaluminosilicate glasses – Analysis of glass network vibration modes with specular-reflection IR spectroscopy
AU - Luo, Jiawei
AU - Smith, Nicholas J.
AU - Pantano, Carlo G.
AU - Kim, Seong H.
N1 - Funding Information:
The mathematical algorithm development and analyses of silica, silicate, borosilicate, and boroaluminosilicate glasses were supported by the National Science Foundation (Grant No. DMR-1609107). The ISG glass analyses was supported as part of the Center for Performance and Design of Nuclear Waste Forms and Containers, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0016584. The authors acknowledged Dr. Paul Duffer for providing the 4 mm thick SLS glass and thermal tempering of SLS glass panels for this study. The thermal tempering part of this study was supported by the International Window Cleaning Association (IWCA). The authors also acknowledged Asahi Glass, Corning Incorporated, and Schott for providing glass samples for this study. The SE analysis was carried out at Corning.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/8/15
Y1 - 2018/8/15
N2 - A novel mathematical algorithm was developed to calculate refractive index (n + ik) from specular reflectance infrared (SR-IR) spectra in the strongly-absorbing glass network vibration region. The method is named as two-angle SR-IR (TASR-IR), since it is based on the Fresnel equations of specular reflectance at two incidence angles (10° and 45°). The results obtained from TASR-IR are comparable with the values obtained from spectroscopic ellipsometry. The TASR-IR method allows one to obtain the peak positions and intensities of fundamental network vibration modes of glass from the imaginary component (k) of complex refractive index without convolutions from the dispersion effect due to chains in the real component (n) of refractive index. The TASR-IR method is applied to silica, silicate, borosilicate, and boroaluminosilicate glasses; tentative peak assignments of glass network vibrations are proposed. The origin and concept of peaks in the vibrational spectra of glasses is discussed.
AB - A novel mathematical algorithm was developed to calculate refractive index (n + ik) from specular reflectance infrared (SR-IR) spectra in the strongly-absorbing glass network vibration region. The method is named as two-angle SR-IR (TASR-IR), since it is based on the Fresnel equations of specular reflectance at two incidence angles (10° and 45°). The results obtained from TASR-IR are comparable with the values obtained from spectroscopic ellipsometry. The TASR-IR method allows one to obtain the peak positions and intensities of fundamental network vibration modes of glass from the imaginary component (k) of complex refractive index without convolutions from the dispersion effect due to chains in the real component (n) of refractive index. The TASR-IR method is applied to silica, silicate, borosilicate, and boroaluminosilicate glasses; tentative peak assignments of glass network vibrations are proposed. The origin and concept of peaks in the vibrational spectra of glasses is discussed.
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U2 - 10.1016/j.jnoncrysol.2018.04.050
DO - 10.1016/j.jnoncrysol.2018.04.050
M3 - Article
AN - SCOPUS:85046621898
SN - 0022-3093
VL - 494
SP - 94
EP - 103
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
ER -