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Can glassforming liquids be 'simple'?


Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe shosse 14, Troitsk, Moscow, 108840, Russian Federation

The tendency of various types of liquids to vitrify at moderate cooling rates is discussed. Good glass-forming liquids—covalent melts, polymer and organic liquids—feature high viscosity values of $10^{-2}$—$10^7$ Pa s at temperatures close to melting point. The glasses obtained by cooling such liquids are nonergodic systems, i.e. their properties are not unambiguously defined by external parameters. At the same time, many glass-forming molecular liquids are usually considered as 'simple' systems described by an effective pair central potential of interaction between particles. In particular, the scaling of thermodynamic and transport characteristics for varying temperature and density and behavior under pressure of the melting temperature and the bulk modulus of molecular liquids are well described by the parameters of a simple effective pair potential. It is shown that the values of the viscosity of glassy molecular liquids in no way correspond to the effective-potential parameters (in contrast to viscosity of the true 'simple' fluids such as liquefied inert gases). Due to the complex structure of the molecules of such liquids, the effective-potential parameters heavily depend on the distance between particles. A complex set of intermolecular and interatomic chemical bonding emerges when such liquids are vitrified. Thus, glass-forming molecular liquids can only be considered as 'simple' from the point of view of their thermodynamic properties, while the polyatomic structure of their molecules results in 'complex' behavior of transport characteristics and anomalously high viscosity values.

Fulltext pdf (570 KB)
Fulltext is also available at DOI: 10.3367/UFNe.2018.06.038382
Keywords: liquids, vitrification, ergodicity, viscosity, scaling, intermolecular interaction
PACS: 64.70.P−, 65.20.De, 66.20.Cy (all)
DOI: 10.3367/UFNe.2018.06.038382
URL: https://ufn.ru/en/articles/2019/6/f/
000484015200006
2-s2.0-85072918071
2019PhyU...62..623B
Citation: Brazhkin V V "Can glassforming liquids be 'simple'?" Phys. Usp. 62 623–629 (2019)
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Received: 5th, April 2018, revised: 27th, May 2018, 19th, June 2018

Оригинал: Бражкин В В «Могут ли стеклообразующие жидкости быть "простыми"?» УФН 189 665–672 (2019); DOI: 10.3367/UFNr.2018.06.038382

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  8. V.V. Brazhkin, R.N. Voloshin et alPhase equilibria in partially open systems under pressure: the decomposition of stoichiometric GeO2 oxidePhys. Usp. 46 1283–1289 (2003)
  9. A.V. Nefediev “On effective range expansion in a multichannel system and compositeness of near-threshold resonancePhys. Usp. 67 71–79 (2024)
  10. A.P. Vinogradov, A.V. Dorofeenko, S. Zouhdi “On the problem of the effective parameters of metamaterialsPhys. Usp. 51 485–492 (2008)
  11. A.I. Frank “On the properties of the "potential" neutron dispersion law in a refractive mediumPhys. Usp. 61 900–901 (2018)
  12. N.N. Rosanov “Unipolar pulse of an electromagnetic field with uniform motion of a charge in a vacuumPhys. Usp. 66 1059–1064 (2023)
  13. I.O. Zolotovskii, R.N. Minvaliev, D.I. Sementsov “Dynamics of frequency-modulated wave packets in optical guides with complex-valued material parametersPhys. Usp. 56 1245–1256 (2013)
  14. P.B. Ivanov “On relativistic motion of a pair of particles having opposite signs of massesPhys. Usp. 55 1232–1238 (2012)
  15. V.N. Zharkov “On estimating the molecular viscosity of the Earth’s outer core: comment on the paper by D E Smylie et al.Phys. Usp. 52 93–95 (2009)
  16. S.N. Semenov, M.E. Schimpf “Mass transport thermodynamics in nonisothermal molecular liquid mixturesPhys. Usp. 52 1045–1054 (2009)
  17. A. Loskutov “Dynamical chaos: systems of classical mechanicsPhys. Usp. 50 939–964 (2007)
  18. M.V. Kuzelev, A.A. Rukhadze “On the quantum description of the linear kinetics of a collisionless plasmaPhys. Usp. 42 603–605 (1999)
  19. S.N. Gordienko “Irreversibility and the probabilistic treatment of the dynamics of classical particlesPhys. Usp. 42 573–590 (1999)
  20. B.N. Shvilkin “On measuring the Debye radius in an unstable gas discharge plasmaPhys. Usp. 41 509–510 (1998)

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