Abstract

Introduction of silver into a silicate glass often leads to reduction and coloration. The electron required for silver reduction is extracted from a nonbridging oxygen atom. The use of high-field-strength ions limits the number of nonbridging oxygens and silver reduction.

© 1992 Optical Society of America

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References

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  1. R. J. Araujo, “Statistical mechanical model of boron coordination,” J. Non-Cryst. Solids 42, 209–230 (1980).
    [CrossRef]
  2. R. J. Araujo, “Statistical mechanics of chemical disorder: application to alkali borate glasses,” J. Non-Cryst. Solids 58, 201–208 (1983).
    [CrossRef]
  3. T. Findakly, “Glass waveguides by ion exchange: a review,” Opt. Eng. 24, 244–250 (1985).
  4. G. H. Sigel, “Vacuum ultraviolet absorption in alkali doped fused silica and silicate glasses,” J. Phys. Chem. Solids 32, 2373–2383 (1971).
    [CrossRef]
  5. Y. H. Yun, P. J. Bray, “Nuclear magnetic resonance studies of the glasses in the system Na2O–B2O3–SiO2,” J. Non-Cryst. Solids 27, 363–380 (1978).
    [CrossRef]
  6. D. Kinder, University of Rochester, Rochester, N.Y. 14627 (personal communication).

1985 (1)

T. Findakly, “Glass waveguides by ion exchange: a review,” Opt. Eng. 24, 244–250 (1985).

1983 (1)

R. J. Araujo, “Statistical mechanics of chemical disorder: application to alkali borate glasses,” J. Non-Cryst. Solids 58, 201–208 (1983).
[CrossRef]

1980 (1)

R. J. Araujo, “Statistical mechanical model of boron coordination,” J. Non-Cryst. Solids 42, 209–230 (1980).
[CrossRef]

1978 (1)

Y. H. Yun, P. J. Bray, “Nuclear magnetic resonance studies of the glasses in the system Na2O–B2O3–SiO2,” J. Non-Cryst. Solids 27, 363–380 (1978).
[CrossRef]

1971 (1)

G. H. Sigel, “Vacuum ultraviolet absorption in alkali doped fused silica and silicate glasses,” J. Phys. Chem. Solids 32, 2373–2383 (1971).
[CrossRef]

Araujo, R. J.

R. J. Araujo, “Statistical mechanics of chemical disorder: application to alkali borate glasses,” J. Non-Cryst. Solids 58, 201–208 (1983).
[CrossRef]

R. J. Araujo, “Statistical mechanical model of boron coordination,” J. Non-Cryst. Solids 42, 209–230 (1980).
[CrossRef]

Bray, P. J.

Y. H. Yun, P. J. Bray, “Nuclear magnetic resonance studies of the glasses in the system Na2O–B2O3–SiO2,” J. Non-Cryst. Solids 27, 363–380 (1978).
[CrossRef]

Findakly, T.

T. Findakly, “Glass waveguides by ion exchange: a review,” Opt. Eng. 24, 244–250 (1985).

Kinder, D.

D. Kinder, University of Rochester, Rochester, N.Y. 14627 (personal communication).

Sigel, G. H.

G. H. Sigel, “Vacuum ultraviolet absorption in alkali doped fused silica and silicate glasses,” J. Phys. Chem. Solids 32, 2373–2383 (1971).
[CrossRef]

Yun, Y. H.

Y. H. Yun, P. J. Bray, “Nuclear magnetic resonance studies of the glasses in the system Na2O–B2O3–SiO2,” J. Non-Cryst. Solids 27, 363–380 (1978).
[CrossRef]

J. Non-Cryst. Solids (3)

R. J. Araujo, “Statistical mechanical model of boron coordination,” J. Non-Cryst. Solids 42, 209–230 (1980).
[CrossRef]

R. J. Araujo, “Statistical mechanics of chemical disorder: application to alkali borate glasses,” J. Non-Cryst. Solids 58, 201–208 (1983).
[CrossRef]

Y. H. Yun, P. J. Bray, “Nuclear magnetic resonance studies of the glasses in the system Na2O–B2O3–SiO2,” J. Non-Cryst. Solids 27, 363–380 (1978).
[CrossRef]

J. Phys. Chem. Solids (1)

G. H. Sigel, “Vacuum ultraviolet absorption in alkali doped fused silica and silicate glasses,” J. Phys. Chem. Solids 32, 2373–2383 (1971).
[CrossRef]

Opt. Eng. (1)

T. Findakly, “Glass waveguides by ion exchange: a review,” Opt. Eng. 24, 244–250 (1985).

Other (1)

D. Kinder, University of Rochester, Rochester, N.Y. 14627 (personal communication).

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Figures (3)

Fig. 1
Fig. 1

Assumed chemical reaction.

Fig. 2
Fig. 2

Structural units in alkali silicate glasses. This schematic representation shows (1) the formation of NBO atoms by the addition of K2O and (2) the formation of bridging oxygen atoms by the addition of equal parts of K2O + Al2O3.

Fig. 3
Fig. 3

Transmittance spectra of alkali silicate glasses. The effect of alumina on absorption edge in alkali-doped fused silica is (1) 0.2 mole % K2O + 0.2 mole % Al2O3 and (2) 0.2 mole % K2O.

Tables (5)

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Table 1 Ionization Potentials In Electron Volts

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Table 2 Comparison of Band Gaps in Silica and Alkali Silicates

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Table 3 Influence of NBO Atoms on Color in Aluminosilicates

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Table 4 Influence of NBO Atoms on Color in Aluminosilicates

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Table 5 Influence of NBO Atoms on Transmittance In Borosilicates

Equations (1)

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NBO = M 2 O - Al 2 O 3 2 × SiO 2 + 1.5 × Al 2 O 3 + 0.5 × M 2 O ,

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