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

DOI PDF 被引用文献2件
  • A. Novatski
    Universidade Estadual de Maringá 1 Departamento de Física, , Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
  • A. Steimacher
    Universidade Estadual de Maringá 1 Departamento de Física, , Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
  • A. N. Medina
    Universidade Estadual de Maringá 1 Departamento de Física, , Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
  • A. C. Bento
    Universidade Estadual de Maringá 1 Departamento de Física, , Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
  • M. L. Baesso
    Universidade Estadual de Maringá 1 Departamento de Física, , Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
  • L. H. C. Andrade
    Universidade Estadual de Mato Grosso do Sul-UEMS 2 Grupo de Espectroscopia Óptica e Fototérmica, , C. P. 351, CEP 79804-970, Dourados, MS, Brazil
  • S. M. Lima
    Universidade Estadual de Mato Grosso do Sul-UEMS 2 Grupo de Espectroscopia Óptica e Fototérmica, , C. P. 351, CEP 79804-970, Dourados, MS, Brazil
  • Y. Guyot
    Université Claude Bernard Lyon 1 3 Laboratoire de Physico-Chimie des Matériaux Luminescents, , UMR 5620 CNRS, 69622, Villeurbanne, France
  • G. Boulon
    Université Claude Bernard Lyon 1 3 Laboratoire de Physico-Chimie des Matériaux Luminescents, , UMR 5620 CNRS, 69622, Villeurbanne, France

書誌事項

公開日
2008-11-01
DOI
  • 10.1063/1.3010306
公開者
AIP Publishing

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<jats:p>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 Al2O3, 7.9–41.6 of SiO2, and 6.5–6.9 of MgO were measured by optical absorption and excitation, luminescence, and Raman spectroscopy. The results showed that when the SiO2 content was increased, the absorption edge shifted toward lower wavelengths and the bonds between O2− 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 SiO2 content. The results indicate that the effects of higher NBO concentration are the narrowing of the band gap energy and the delocalization of O2− electrons, which facilitates the O2− electrons to be trapped by anion vacancies and, consequently, forming color centers. The relationship between color center formation and SiO2 content was confirmed by optical spectroscopic measurements under UV radiation.</jats:p>

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