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Title: Relations among nonbridging oxygen, optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses

Abstract

In this study the relations among nonbridging oxygen (NBO), optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses were studied. Samples containing (in mol %) 35.9-57.5 of CaO, 16-27.7 of Al{sub 2}O{sub 3}, 7.9-41.6 of SiO{sub 2}, and 6.5-6.9 of MgO were measured by optical absorption and excitation, luminescence, and Raman spectroscopy. The results showed that when the SiO{sub 2} content was increased, the absorption edge shifted toward lower wavelengths and the bonds between O{sup 2-} ions and cations became more covalent. These observations were confirmed by Raman results that showed a decrease in the number of NBO per silicon tetrahedron as a function of SiO{sub 2} content. The results indicate that the effects of higher NBO concentration are the narrowing of the band gap energy and the delocalization of O{sup 2-} electrons, which facilitates the O{sup 2-} electrons to be trapped by anion vacancies and, consequently, forming color centers. The relationship between color center formation and SiO{sub 2} content was confirmed by optical spectroscopic measurements under UV radiation.

Authors:
; ; ; ;  [1]; ;  [2]; ;  [3]
  1. Departamento de Fisica, Universidade Estadual de Maringa, Av. Colombo 5790, 87020-900, Maringa, PR (Brazil)
  2. Grupo de Espectroscopia Optica e Fototermica, Universidade Estadual de Mato Grosso do Sul-UEMS, C. P. 351, CEP 79804-970, Dourados, MS (Brazil)
  3. Laboratoire de Physico-Chimie des Materiaux Luminescents, Universite Claude Bernard Lyon 1, UMR 5620 CNRS, 69622, Villeurbanne (France)
Publication Date:
OSTI Identifier:
21185906
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 104; Journal Issue: 9; Other Information: DOI: 10.1063/1.3010306; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ALUMINIUM OXIDES; ALUMINIUM SILICATES; ANIONS; CALCIUM OXIDES; CATIONS; COLOR CENTERS; COVALENCE; CRYSTALS; ELECTRONS; GLASS; MAGNESIUM OXIDES; OPTICAL PROPERTIES; OXYGEN IONS; PHOTOLUMINESCENCE; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SILICON; SILICON OXIDES; ULTRAVIOLET RADIATION

Citation Formats

Novatski, A, Steimacher, A, Medina, A N, Bento, A C, Baesso, M L, Andrade, L H. C., Lima, S M, Guyot, Y, and Boulon, G. Relations among nonbridging oxygen, optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses. United States: N. p., 2008. Web. doi:10.1063/1.3010306.
Novatski, A, Steimacher, A, Medina, A N, Bento, A C, Baesso, M L, Andrade, L H. C., Lima, S M, Guyot, Y, & Boulon, G. Relations among nonbridging oxygen, optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses. United States. https://doi.org/10.1063/1.3010306
Novatski, A, Steimacher, A, Medina, A N, Bento, A C, Baesso, M L, Andrade, L H. C., Lima, S M, Guyot, Y, and Boulon, G. Sat . "Relations among nonbridging oxygen, optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses". United States. https://doi.org/10.1063/1.3010306.
@article{osti_21185906,
title = {Relations among nonbridging oxygen, optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses},
author = {Novatski, A and Steimacher, A and Medina, A N and Bento, A C and Baesso, M L and Andrade, L H. C. and Lima, S M and Guyot, Y and Boulon, G},
abstractNote = {In this study the relations among nonbridging oxygen (NBO), optical properties, optical basicity, and color center formation in CaO-MgO aluminosilicate glasses were studied. Samples containing (in mol %) 35.9-57.5 of CaO, 16-27.7 of Al{sub 2}O{sub 3}, 7.9-41.6 of SiO{sub 2}, and 6.5-6.9 of MgO were measured by optical absorption and excitation, luminescence, and Raman spectroscopy. The results showed that when the SiO{sub 2} content was increased, the absorption edge shifted toward lower wavelengths and the bonds between O{sup 2-} ions and cations became more covalent. These observations were confirmed by Raman results that showed a decrease in the number of NBO per silicon tetrahedron as a function of SiO{sub 2} content. The results indicate that the effects of higher NBO concentration are the narrowing of the band gap energy and the delocalization of O{sup 2-} electrons, which facilitates the O{sup 2-} electrons to be trapped by anion vacancies and, consequently, forming color centers. The relationship between color center formation and SiO{sub 2} content was confirmed by optical spectroscopic measurements under UV radiation.},
doi = {10.1063/1.3010306},
url = {https://www.osti.gov/biblio/21185906}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 104,
place = {United States},
year = {2008},
month = {11}
}