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Journal of Applied Physics / Volume 104 / Issue 9 / INTERDISCIPLINARY AND GENERAL PHYSICS

J. Appl. Phys. 104, 094910 (2008); http://dx.doi.org/10.1063/1.3010306 (7 pages)

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

A. Novatski1, A. Steimacher1, A. N. Medina1, A. C. Bento1, M. L. Baesso1, L. H. C. Andrade2, S. M. Lima2, Y. Guyot3, and G. Boulon3

1Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
2Grupo de Espectroscopia Óptica e Fototérmica, Universidade Estadual de Mato Grosso do Sul-UEMS, C. P. 351, CEP 79804-970, Dourados, MS, Brazil
3Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard Lyon 1, UMR 5620 CNRS, 69622, Villeurbanne, France

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(Received 3 April 2008; accepted 18 September 2008; published online 11 November 2008)

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.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL PROCEDURE
  3. RESULTS AND DISCUSSION
    1. Relations among band gap, optical basicity, and NBO
      1. Optical absorption coefficient and band gap determination
      2. Optical basicity
      3. Estimation of NBO per (AlO4)− tetrahedron based on stoichiometry
      4. Raman results
    2. Behavior of color center formation as a function of NBO content
      1. Optical absorption
    3. Excitation and luminescence
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

aluminosilicate glasses, calcium compounds, colour centres, magnesium compounds, optical constants, photoluminescence, Raman spectra, ultraviolet radiation effects, vacancies (crystal)

PACS

  • 61.72.jn

    Color centers

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 61.72.jd

    Vacancies

  • 78.55.Hx

    Other solid inorganic materials

  • 78.30.Hv

    Other nonmetallic inorganics

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3010306

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    D. F. de Sousa, L. F. C. Zonetti, M. J. V. Bell, J. A. Sampaio, L. A. O. Nunes, M. L. Baesso, A. C. Bento, and L. C. M. Miranda, Appl. Phys. Lett. 74, 908 (1999)APPLAB000074000007000908000001.

    H. Hosono, N. Asada, and Y. Abe, J. Appl. Phys. 67, 2840 (1990)JAPIAU000067000006002840000001.

    L. H. C. Andrade, S. M. Lima, A. Novatski, P. T. Udo, N. G. C. Astrath, A. N. Medina, A. C. Bento, M. L. Baesso, Y. Guyot, and G. Boulon, Phys. Rev. Lett. 100, 027402 (2008).

    E. Georgiou, J. F. Pinto, and C. R. Pollock, Phys. Rev. B 35, 7636 (1987).

    F. Urbach, Phys. Rev. 92, 1324 (1953).

    T. H. Keil, Phys. Rev. 144, 582 (1966).


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