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Panfilovich, K. B.; Sagadeev, V. V.

doi:10.1023/a:1009474305270

Cited by 5 publications

(4 citation statements)

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“…29 As is generally known, the thermal emissivity data are very difficult to get. However, existing literature data indicate a difference of the integral thermal emissivity coefficients of $0.04 between liquid Pb 27 and Ga 28 which can explain the kinks in the cooling curves.…”

Section: B Wetting Behaviour In the Miscibility Gapmentioning

confidence: 96%

Surface freezing and wetting in Ga–Pb alloy: Second harmonic and plasma generation study

Turchanin¹,

Freyland²

2003

Phys. Chem. Chem. Phys.

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Section: B Wetting Behaviour In the Miscibility Gapmentioning

confidence: 96%

Surface freezing and wetting in Ga–Pb alloy: Second harmonic and plasma generation study

Turchanin¹,

Freyland²

2003

Phys. Chem. Chem. Phys.

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“…where the emissivity of the Ga-rich and Bi-rich liquids is estimated by the linear combination ε X = (1 − x e X )(T + 140)/6250 + x e X (T + 100)/3000 of the emissivity of the pure elements [18]. According to the Ga-Bi phase diagram the equilibrium mole fraction of bismuth in the Bi-rich liquid film is equal to x e B = (588 − T )/143 in the neighbourhood of 520 K. The characteristic thickness where ε = (ε G + ε B )/2 is about 0.07 µm.…”

Section: Model Calculations For Gallium-bismuthmentioning

confidence: 99%

Oscillatory interfacial instabilities in binary metallic fluids

Dogel¹,

Freyland²,

Nattland³

et al. 2005

J. Phys.: Condens. Matter

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Oscillatory wetting-dewetting instabilities at the liquid/vapour interface of Ga-Pb and, for the first time, of Ga-Bi alloys have been studied employing second harmonic generation and kinetic ellipsometry. Alloy samples prepared at x-T conditions inside the respective miscibility gap (Ga 0.8 Bi 0.2 : T = 520 K; Ga 0.95 Pb 0.05 : T = 595 K) show oscillations on the timescale of typically hours. The surface transforms back and forth from a Ga-rich non-wetting state to a complete wetting state where the Ga-rich bulk is covered with a Bi-rich (or Pbrich) film. In the case of Ga-Bi the change of the wetting film thickness was characterized quantitatively with the aid of the ellipsometric measurements. It is consistent with a wetting-dewetting mechanism whereby the wetting film varies periodically between macroscopic and microscopic values. The phenomenon can be understood taking different emissivities of the wet and the nonwet state into account. They cause at otherwise constant conditions different temperatures of the sample, which has to adopt its phase compositions according to the respective phase diagram. This results in mass transport to and away from the surface. A model calculation on Ga-Bi taking these effects into account recovers in good quantitative agreement the oscillation period and the oscillations of the temperature as well as of the film thickness. Similarities and differences between Ga-Bi and Ga-Pb are finally considered.

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“…22 Here, the Pb mole fraction in the Pb-rich liquid film is considered to be the equilibrium one, which according to the Ga-Pb phase diagram 12 is equal to x P e ϭ(4512ϪT)/4240. This linear dependence on temperature holds in the interval 600-700 K. In Fig.…”

Section: B Emissivity Modelmentioning

confidence: 99%

Oscillatory wetting instability induced by liquid–liquid decomposition in a Ga–Pb alloy

Turchanin

Tsekov

Freyland

2004

The Journal of Chemical Physics

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We present the first experimental investigation and pertinent theoretical modeling of an interfacial oscillatory instability in a binary fluid alloy, the Ga-Pb system. It is characterized by spinodal decomposition at elevated temperatures and by a complete wetting transition at liquid-liquid coexistence. For the alloy Ga(0.95)Pb(0.05) the fluid interface has been probed by second harmonic generation (SHG) under UHV conditions at temperatures between 740 and 550 K. At conditions inside the miscibility gap clear oscillations of the SHG-intensity with a period of approximately 30 min are found for different cooling cycles and also at constant temperatures. These interfacial oscillatory instabilities simultaneously induce temperature oscillations in the bulk fluid with the same period. This phenomenon can be explained by a periodic variation of the fluid interfacial emissivity. A model has been developed which describes the wetting-dewetting dynamics by hydrodynamic equations within the Reynolds approximation. It is found that the interfacial oscillatory instability is determined by capillary-gravitation instability. The model quantitatively describes the time evolution of the interfacial and temperature oscillations and gives the correct value of the oscillation period. A detailed comparison of the experimental and model results is given.

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Cited by 5 publications

References 0 publications

Surface freezing and wetting in Ga–Pb alloy: Second harmonic and plasma generation study

Surface freezing and wetting in Ga–Pb alloy: Second harmonic and plasma generation study

Oscillatory interfacial instabilities in binary metallic fluids

Oscillatory wetting instability induced by liquid–liquid decomposition in a Ga–Pb alloy

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