Preparation of porous glass films using phase separation phenomenon and growth behavior of phase-separated structure

Hwang, Chawon; Kim, Jong Hwan; Ryu, Bong Ki; Takebe, Hiromichi

doi:10.1007/s10853-013-7618-9

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…In the literature, rate laws with exponents smaller than one‐third have scarcely been reported. The only example, where lower rates are observed, which change during annealing time, but not with temperature during the preparation of a thin porous by layer of a Na 2 O–SiO 2 –B 2 O 3 glass by heat treatment. Changing the temperature affects the growth of particles in the system in three ways.…”

Section: Discussionmentioning

confidence: 99%

Self‐Organized Growth of Sodium Borate‐Rich Droplets in a Phase‐Separated Sodium Borosilicate Glass

Häßler

Rüssel

2016

Int J of Appl Glass Sci

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A glass with the composition 60 SiO2, 37 B2O3, and 3 Na2O was casted and subsequently cooled to room temperature. During subsequent heat treatment at temperatures in the range from 520 to 680°C, the glass shows phase separation and SiO2‐rich droplets in a B2O3‐rich matrix are formed. The droplet size strongly depends on the temperature and duration of heat treatment. In the dilatometric curves of the phase‐separated glasses, two glass transition temperatures are observed. At high annealing temperatures, the transition temperatures vary according to the decomposition cupola. At lower temperatures, the phase formation is restricted by the kinetics. Particle sizes and growth rates are not governed by Ostwald ripening and deviate from the expected rate law d ~ t1/3. The exponent in the rate law is much smaller than one‐third, and hence, the coarsening of the droplet structured is hindered. In analogy to crystal growth models reported in the literature, this growth hindrance is explained by the formation of a highly viscous shell around growing particles.

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Section: Discussionmentioning

confidence: 99%

Self‐Organized Growth of Sodium Borate‐Rich Droplets in a Phase‐Separated Sodium Borosilicate Glass

Häßler

Rüssel

2016

Int J of Appl Glass Sci

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“…Interestingly, the same authors note that the case where phase separation at walls and in thin films starts by the formation of critical nuclei has received less attention 18 . Zinge-Allmang 19 summarized theoretical models and a handful of experimental or numerical studies [20][21][22] suggesting long transient regimes and slower coarsening dynamics compared to the bulk case, but also noted that no broad consensus exists because of a scarcity of experimental and numerical studies.…”

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confidence: 99%

“…Its use in the context of inorganic thin films was pioneered by Seward et al 25 in 1968. The development of Physical Vapor Deposition (PVD) techniques have recently triggered progress on the deposition of phase separated thin films of oxide glasses or suboxide materials 4,20,[26][27][28][29][30] .…”

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confidence: 99%

Slow coarsening of ultra-confined phase-separated glass thin films

Bouteille

Fonné

Burov

et al. 2022

Applied Physics Letters

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Diffusion-driven coarsening of droplets is a classical subject in statistical physics, yet coarsening kinetics in confined systems have received little attention. We report here on the coarsening of droplets in thin (50–200 nm) films of phase-separated barium borosilicate glasses. In this ultra-confined geometry where at most one droplet is observed within the film thickness, droplets grow like a power-law of time with an exponent about 0.17 significantly smaller than that of the one of Ostwald ripening (1/3) characteristic of bulk coarsening. We complement these experimental results with two-dimensional Cahn–Hilliard numerical simulations of diffusion, where a wider range of parameters can be varied. In simulations, we recover a slow coarsening behavior in ultra-confined geometry. We explain the anomalous scaling exponent of simulations by ultraconfined geometry, which imposes a different scaling with time of the radius of a droplet and the distance between droplets. In the experimental system, diffusive transport also becomes less efficient with time compared to the bulk case with an additional change of geometry compared to simulations. Flattening of droplets with time is indeed observed, which we attribute to strong variations of the diffusion coefficient with the local matrix composition. We finally propose a simple model assuming a spatial localization of the diffusion paths to account for this effect.

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“…[15] The growth behavior of thin film fabricated by physical vapor deposition was investigated in recent years. [16,17] There are three types [18] of growth modes for different deposition processes: the Frank-Van Der Merve mode, the Stranski-Krastanov mode and the Volmer-Weber mode. Many kinds of thin films growth belong to the Volmer-Weber mode.…”

mentioning

confidence: 99%

Growth and Morphology of Magnetron-Sputtered TiAl Alloy Thin Films Studied by Atomic Force Microscopy

Shui¹,

Yan²

2014

Chinese Phys. Lett.

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At the aim of investigating the growth mechanism and morphology evolution of magnetron-sputtered TiAl alloy thin films, we observe the films deposited for different times and find out the variation by atomic force microscopy. Nucleation mechanism and growth kinetics are studied by dynamic scaling, obtained from the morphology evolution of as-deposited TiAl thin films with different growth times. As a result, we demonstrate that the process of film growth goes through three stages, divided by three different growth exponents. The three growth exponents are 𝛽1 = 0.52 ± 0.01, 𝛽2 = 0.71 ± 0.01, and 𝛽3 = 0.17 ± 0.02, respectively. With the deposition time varying from 2 min to 10 min, the roughness exponent 𝛼 fluctuates in the range 0.61-1.16.

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Preparation of porous glass films using phase separation phenomenon and growth behavior of phase-separated structure

Cited by 4 publications

References 23 publications

Self‐Organized Growth of Sodium Borate‐Rich Droplets in a Phase‐Separated Sodium Borosilicate Glass

Self‐Organized Growth of Sodium Borate‐Rich Droplets in a Phase‐Separated Sodium Borosilicate Glass

Slow coarsening of ultra-confined phase-separated glass thin films

Growth and Morphology of Magnetron-Sputtered TiAl Alloy Thin Films Studied by Atomic Force Microscopy

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