Sodium and silver environments and ion-exchange processes in silicate and aluminosilicate glasses

Houde‐Walter, S. N.; Inman, J.M.; Dent, A. J.; Greaves, G.N.

doi:10.1021/j100139a013

Cited by 136 publications

(78 citation statements)

References 4 publications

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“…The Ag-O distance is 2.15Å. A similar behaviour was already observed for sodium tetrasilicate and sodium aluminosilicate glasses [8], borate glasses [9] and soda-lime glasses with lower amounts of iron [10] as used here. These results show distinct differences compared to the sodium environment of the base glass before the ion exchange.…”

Section: Structural Relaxation Around Ag Ionssupporting

confidence: 85%

“…These results show distinct differences compared to the sodium environment of the base glass before the ion exchange. Usually, the Na-O distances in such sodium silicate glasses are 2.3-2.4Å and the coordination number amounts to approximately five (see for example [8,10]). That means, in spite of the low process temperatures, well below the glass transformation, the silver incorporation causes local rearrangements.…”

Section: Structural Relaxation Around Ag Ionsmentioning

confidence: 99%

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Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Dubiel¹,

Haug²,

Kruth³

et al. 2008

Materials Science and Engineering: B

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We investigated the formation of very small Ag nanoparticles of 1-2 nm size in soda-lime glass with enhanced amounts of iron oxide by Ag/Na ion exchange procedures. The duration of ion exchange has been chosen between 20 and 600 h to study the processes systematically. It could be shown that structural relaxations take place as the Ag + ions were incorporated into the glass replacing the Na + of the original matrix. X-ray absorption spectroscopy at the Fe K-edge demonstrated that polyvalent Fe ions served as thermosensitive reductive during the ion exchange well below the glass transformation temperature. The transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) experiments revealed the formation of Ag nanoparticles of sizes from 1.4 to 1.8 nm in surface-near regions for exchange periods up to 400 h at 330• C. By combination of TEM and EXAFS also the presence of metastable particles like, e.g., argentous species in the process of precipitation of very small particles has been indicated. These silver containing precipitates were transformed into crystalline silver nanoparticles for a prolonged ion exchange duration of ≈600 h.

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Section: Structural Relaxation Around Ag Ionssupporting

confidence: 85%

Section: Structural Relaxation Around Ag Ionsmentioning

confidence: 99%

Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Dubiel¹,

Haug²,

Kruth³

et al. 2008

Materials Science and Engineering: B

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show abstract

“…This difference of the ionic radius would increase the volume of mother glass. Furthermore, as reported by Houde-Walter et al, 14 these ions have quite different coordination number in the aluminosilicate glasses each other. So NBO-free ionexchanged glasses would be hard to release an induced structural strain owing to the difference of coordination number at the ion-exchange temperature of 450c C below the glass transition temperature T g , it would be reasonable to consider that the structural shrink during annealing indicates the occurrence of the structural relaxation centering Ag ions.…”

supporting

confidence: 51%

“…11 EXAFS analysis of Ag Na ionexchanged aluminosilicate glasses 14 showed that the coordination number of Ag ions in glasses was 2-3 much lower than that of alkali ions, 5-6. XPS analysis of Ag Na ionexchanged silicate glasses 10 also suggested the existence of Ag ions coordinated with one NBO and one BO.…”

Section: 13mentioning

confidence: 99%

Mechanical Properties of Ag+/Na+ Ion-exchanged Aluminosilicate Glasses

Funabiki

Yano

Shibata

et al. 2007

J. Ceram. Soc. Japan

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Mechanical properties of Ag Na ion-exchanged aluminosilicate glasses are investigated. The aluminosilicate glass samples with the thickness of 1 mm and homogeneous Ag Na concentrations were prepared via the ion exchange in the molten salt at 450? C and the following post-heating in the ambient atmosphere. Measured Young's modulus, Vickers hardness and fracture toughness in a dry nitrogen atmosphere change nonlinearly with increasing Ag Ag Na ratio, and show the maximum values, 75 GPa, 560 kgmm 2 and 0.84 MNm 32around Ag Ag Na 50!, respectively. Fully exchanged glass shows the same modulus 70 GPa as that of the mother glass and the smallest hardness and toughness, 500 kgmm 2 and 0.74 MNm 32 , respectively. The calculated yield stress decreases from 2.59 GPa to 2.30 GPa with increasing Ag Ag Na at more than 60! region. Coexistence of Ag Na induces mixed cation effect, and gives a maximum to the elastic modulus at AgNa 11. Additionally, the yield stress of glass is decreased with increasing Ag concentration by the difference of the effect on Al-O-Si network between Ag and Na .

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“…This model results from XAFS data in which the number of nonbridging oxygens ͑NBO͒ around alkali ions was found to be larger than that of bridging oxygens ͑BO͒. [1][2][3] In this model, there is a process of microsegregation in the glass and the modifying cations form clusters in the SiO 2 rich matrix, to which they are predominantly linked via the NBO's. At higher concentrations, the clusters percolate through the glass bulk giving rise to pathways for ionic conduction.…”

Section: Introductionmentioning

confidence: 99%

Molecular-dynamics simulations of(NaO2)x(SiO2
Oviedo
¹
,
Sanz
²

1998
Phys. Rev. B
49
4
30
0
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Molecular-dynamics simulations of sodium silicate glasses in a range of alkali concentration going from 1.8% to 33.33% molar of Na 2 O are reported. Our simulations show that there is a tight relationship between Na atoms and nonbridging oxygens which are mainly located in the first Na coordination shell. In the whole range of composition, Na and nonbridging oxygen atoms appear to segregate giving rise to a heterogeneous distribution. For the higher alkali concentrations, formation of microchannels is observed. The activation energies for alkali diffusion have been computed and found in agreement with the experiment. The mechanism for the diffusion has also been investigated and found to occur through the microchannels, if present, or across the network for low compositions, but the Na motions always appear to be assisted by nonbridging oxygen atoms.

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Sodium and silver environments and ion-exchange processes in silicate and aluminosilicate glasses

Cited by 136 publications

References 4 publications

Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Mechanical Properties of Ag+/Na+ Ion-exchanged Aluminosilicate Glasses

Molecular-dynamics simulations of(NaO2)x(SiO2
Oviedo
¹
,
Sanz
²

1998
Phys. Rev. B
49
4
30
0
View full text Add to dashboard Cite

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Sodium and silver environments and ion-exchange processes in silicate and aluminosilicate glasses

Cited by 136 publications

References 4 publications

Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Ag/Na ion exchange in soda-lime glasses and the formation of small Ag nanoparticles

Mechanical Properties of Ag+/Na+ Ion-exchanged Aluminosilicate Glasses

Molecular-dynamics simulations of(NaO2)x(SiO2Oviedo1, Sanz2 1998Phys. Rev. B494300View full textAdd to dashboardCite

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Molecular-dynamics simulations of(NaO2)x(SiO2
Oviedo
¹
,
Sanz
²

1998
Phys. Rev. B
49
4
30
0
View full text Add to dashboard Cite