Aluminum‐enhanced alkali diffusion from float glass to PVD‐sputtered silica thin films

Fonné, Jean-Thomas; Burov, Ekaterina; Gouillart, Emmanuelle; Grachev, Sergey; Montigaud, Hervé; Vandembroucq, Damien

doi:10.1111/jace.15340

Cited by 7 publications

(19 citation statements)

References 58 publications

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“…We finally discuss our results along three lines: the counter‐intuitive effect of aluminum doping on the diffusivity and viscosity of the silica thin films, related to increased alkali uptake as shown in Ref. ; the modeling of the diffusive transport of silica and alumina in the presence of a diffusivity gradient; the interpretation of our results in the framework of multicomponent diffusion.…”

Section: Introductionmentioning

confidence: 76%

“…The materials used in this study are the same as in our previous study . However, we reproduce here part of the sample description and analysis methods for the sake of completeness.…”

Section: Methodsmentioning

confidence: 99%

“…In a recent paper, we showed that the uptake of sodium by silica barrier layers deposited on soda‐lime glass substrates is proportional to the aluminum content of the silica thin film. Aluminum doping is classically used to enhance the deposition rate of silica in industrial Physical Vapor Deposition (PVD) coaters .…”

Section: Introductionmentioning

confidence: 99%

“…During this annealing stage, alkali species such as sodium or potassium diffuse from the substrate to the coatings, which alters the electrical or mechanical properties of active layers. In order to protect active layers from the migration of alkali, glass substrates are coated with barrier layers such as silica, silicon nitride, or alumina …”

Section: Introductionmentioning

confidence: 99%

“…We use the same samples described in Ref. . but focus on later interactions and interdiffusion between film and substrate.…”

Section: Introductionmentioning

confidence: 99%

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Interdiffusion between silica thin films and soda‐lime glass substrate during annealing at high temperature

et al. 2018

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We study the diffusive interaction between soda‐lime glass substrates and sputtered aluminum‐doped silica thin films at 650°C, the temperature of commercial soda‐lime glass shaping or tempering. A first rapid migration of alkali ions from substrate to thin film has been described in a companion paper (J Am Ceram Soc. 2018;101:1516). Using the same samples as (J Am Ceram Soc. 2018;101:1516), we focus here on later interactions, when the layer is consumed by the substrate resulting from diffusive interactions. Using Secondary Ion Mass Spectroscopy profilometry, we show that the interdiffusion rate increases with the aluminum doping content of the layer. We show that the alkali uptake of silica layers accelerates diffusive exchanges with the substrate, consistently with a decrease of viscosity of the layer. Diffusion profiles of silicon are well reproduced when solving the diffusion equation for a diffusivity having an exponential dependence with silicon concentration. The diffusivity of aluminum is shown to be 10 times slower than the diffusion of silicon. Specific exchanges of the two network formers with network modifiers are deduced from the composition‐space trajectories, providing evidence for multicomponent diffusive couplings between species.

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Section: Introductionmentioning

confidence: 76%

“…The materials used in this study are the same as in our previous study . However, we reproduce here part of the sample description and analysis methods for the sake of completeness.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…We use the same samples described in Ref. . but focus on later interactions and interdiffusion between film and substrate.…”

Section: Introductionmentioning

confidence: 99%

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Interdiffusion between silica thin films and soda‐lime glass substrate during annealing at high temperature

et al. 2018

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Propylene oligomerization over SiO2-overcoated oxides

Wolek,

Sowinski,

Gounder

et al. 2024

Journal of Catalysis

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Influence of temperature on multicomponent diffusion in calcium and sodium aluminosilicate melts

Claireaux

Chopinet

Burov

et al. 2019

Journal of Non-Crystalline Solids

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The effect of temperature on multicomponent chemical diffusion in liquids of the quaternary system CaO−Na 2 O−Al 2 O 3 −SiO 2 has been studied. Diffusion-couple experiments were performed around a central composition of 64.5 wt%SiO 2 , 13.3 wt%Na 2 O, 10.8 wt%CaO, 11.4 wt%Al 2 O 3. Experiments were performed for three temperatures far above the glass transition (1200, 1280 and 1360 • C), as well as 30 • C above the glass transition. Strong multidiffusive effects were observed for all temperatures, with significant uphill diffusion of calcium, demonstrating that uphill diffusion happens close to the glass transition as well as at high temperature. For each temperature, we determined the diffusion matrix of the system and quantified its eigenvectors and eigenvalues, which correspond formally to (respectively) exchanges between ions, and associated diffusion coefficients. Little variation of the eigenvectors of the diffusion matrix was observed as a function of temperature, with a dominant eigenvector corresponding to the exchange of sodium with calcium, the two other eigenvectors corresponding to the exchange of calcium with network formers. For the temperature range 1200-1360°C, the eigenvalues of the diffusion matrix have an Arrhenian temperature dependence, with an activation energy consistent with electrical conductivity for the exchange of sodium and calcium, and an activation energy consistent with viscosity for eigenvectors involving network formers. Multicomponent diffusion close to the glass transition is characterized by the same eigenvectors as at higher temperature, but some diffusion profiles are asymmetric due to strong viscosity contrasts resulting in concentration-dependent eigenvalues. Moreover, we observe some departure from Eyring relation close to the glass transition, with diffusion eigenvalues several orders of magnitude greater than the Eyring prediction. Highlights-Multicomponent diffusion matrices were determined experimentally around a central composition of 64.5 wt%SiO 2 , 13.3 wt%Na 2 O, 10.8 wt%CaO, 11.4 wt%Al 2 O 3 , for three superliquidus temperatures and 30 degrees above the glass transition.-Eigenvalues of the diffusion matrix were found to be Arrhenian down to 30 degrees above the glass transition.-Eigenvalues of exchanges involving network formers are in good agreement with Eyring's law at superliquidus temperatures, but a departure from Eyring's law is observed close to the glass transition. 65 108 2.2. Viscosities 109 Viscosities of the 12 end-member compositions were 110 measured in the range 1100 to 1400 • C, using a 111 288 periments with a gradient of aluminum show a slight 289 uphill diffusion of sodium. Uphill diffusion of sodium 290 is only observed close to T g and not at higher tempera-291 ture. 292 3.3. Diffusion matrix 293 For each temperature of the [1200 − 1360] • C range, 294 we used all available diffusion couples to obtain the 295 least-square estimation of the diffusion matrix. Close 296 to T g , the AN/NA couple was not used for the estima-297 tion of the diff...

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Aluminum‐enhanced alkali diffusion from float glass to PVD‐sputtered silica thin films

Cited by 7 publications

References 58 publications

Interdiffusion between silica thin films and soda‐lime glass substrate during annealing at high temperature

Interdiffusion between silica thin films and soda‐lime glass substrate during annealing at high temperature

Propylene oligomerization over SiO2-overcoated oxides

Influence of temperature on multicomponent diffusion in calcium and sodium aluminosilicate melts

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