Soret effect in binary glass-forming oxide melts: theory and its verification

Abstract

Soret effect is temperature-gradient-driven mass diffusion in a multicomponent system. This paper reviews the recent progress of understanding the Soret effect in glass-forming oxide melts. A new model, called adjusted Kempers model, is proposed to quantitatively predict Soret coefficients in binary glass-forming oxide melts. The model is verified by experiment and molecular dynamics simulation. In a 11Na 2 O89B 2 O 3 (mol %) melt, the difference of the Soret coefficient of Na 2 O between experiment and theory is 19%. In the nonequilibrium molecular dynamics simulation of CaOSiO 2 glass melts, the Soret coefficient of SiO 2 is decreased with SiO 2 content and a sign change is observed, which is consistent with the adjusted Kempers model. These results indicate that the adjusted Kempers model is promising. Additionally, this paper reviews the laser-induced Soret effect in multicomponent glasses.

Effect of Pulse Repetition Rate on Ultrafast Laser-Induced Modification of Sodium Germanate Glass

“…To explain the unexpected effect of retardance growth with the PRR in the laser-written nanogratings in SG22 glass, earlier reported data on redistribution of alkali cations during the inscription of nanogratings in 15Na 2 O·85SiO 2 glass are helpful [ 17 ]. The formation of those nanogratings using 10 6 –10 7 pulses with 600 fs duration at 200 kHz PRR was accompanied by the migration of most of Na + cations out of the nanograting driven by the thermal diffusion (also known as Soret effect [ 39 ]). The rest of the Na + was concentrated in the nanoplanes, giving rise to the precipitation of Na 2 Si 4 O 9 nanocrystals.…”