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Prog. Theor. Phys. Supplement No.138 (2000) pp. 211-216

[ Full Text PDF : FREE ACCESS (107K) ]

Fast and Slow Dynamics in Metasilicate Glasses

Junko Habasaki1,* and Yasuaki Hiwatari2,**

1 Tokyo Institute of Technology, Nagatsuta 4259, Yokohama 226-8502, Japan
2 Kanazawa University, Kanazawa 920-1192, Japan

(Received October 11, 1999)

Abstract:

Molecular dynamics (MD) simulations of lithium metasilicate (Li2SiO3) glass has been performed. Dynamics of lithium ions in metasilicate glass were found to divide into fast and slow ones in the glassy state. We have divided the particles into type A (slow dynamics) and B (fast dynamics). We have examined the characteristics of the dynamics and structure with distinguishing between type A and B particles. Type A particles are located within neighboring sites during a 1 ns run. Such particles show only single jumps and tend to return to their previous sites due to low dimensional local paths. The particles with long waiting time of the jump motion is also included type A particles. On the other hand, type B particles show accelerated dynamics. Cooperative jumps (simultaneous jumps of neighboring ions or occurring within several ps before the relaxation of the jump sites) cause the acceleration. Power law distributions of the displacements reveal that the fast dynamics is characterized as Lévy flight. Short intervals of the jump events also take place in the fast dynamics at short time region. We have found the difference in the medium range structure concerning type A and B particles. The structure for type B particles seems to be favorable to cause the cooperative jumps.


URL : http://ptp.ipap.jp/link?PTPS/138/211/
DOI : 10.1143/PTPS.138.211


*Email address: jhabasak@n.cc.titech.ac.jp
** Email address: hiwatari@hiwa003.s.kanazawa-u.ac.jp

[ Full Text PDF : FREE ACCESS (107K) ] Citation:

References:

  1. J. Habasaki, I. Okada and Y. Hiwatari, Phys. Rev. B55 (1997), 6309[APS].
  2. J. Habasaki, I. Okada and Y. Hiwatari, J. Phys. Soc. Jpn. 67 (1998), 2012[JPSJ].
  3. J. Habasaki, I. Okada and Y. Hiwatari, in Structure and Dynamics of Glasses and Glass Formers, ed. C. A. Angell, K. L. Ngai, J. Kieffer, T. Egami and G. U. Nienhaus (Materials Research Society, Pittsburgh, 1997), MRS Simposium Proceedings No. 455, p. 91.
  4. A. Blumen, K. Klafter, B. S. White and G. Zumofen, Phys. Rev. Lett. 53 (1984) 1301[APS].
  5. M. F. Shlesinger, G. M. Zaslavsky and J. Klafter, Nature 363 (1993), 31[CrossRef].
    J. Klafter, M. F. Shlesinger and G. Zumofen, Physics Today 49 (2) (1996), 33.
  6. J. Habasaki, I. Okada and Y. Hiwatari, Phys. Rev. E52 (1995), 2681[APS].
  7. J. Habasaki, I. Okada and Y. Hiwatari, J. Non-Cryst. Solids 183 (1995), 12[CrossRef].
  8. J. Habasaki, I. Okada and Y. Hiwatari, J. Non-Cryst. Solids 208 (1996), 181[CrossRef].
  9. J. Habasaki, I. Okada and Y. Hiwatari, Prog. Theor. Phys. Suppl. No. 126 (1997), 399[PTP].
  10. J. Habasaki and I. Okada, Molec. Simul. 9 (1992), 319.
  11. Y. Ida, Phys. Earth Planet Interiors 13 (1976), 97.
  12. J. Habasaki and Y. Hiwatari, Phys. Rev. E59 (1999), 6962[APS].
  13. X.-J. Wang, Phys. Rev. A45 (1992), 8407[APS].
  14. J. Klafter, A. Blumen and M. F. Shlesinger, Phys. Rev. A35 (1987), 3081[APS].

Citing Article(s) :

  1. Journal of the Physical Society of Japan 70 (2001) pp. 2805-2808 :
    Nonlinear Transport and Anomalous Brownian Motion in Soft-Mode Turbulence
    Koyo Tamura, Yusril Yusuf, Yoshiki Hidaka and Shoichi Kai

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