Europhys. Lett.
Volume 47, Number 2, July 1999
Page(s) 213 - 219
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00375-2

Europhys. Lett, 47 (2), pp. 213-219 (1999)

The liquid-glass transition in a strong network glass former investigated by neutron scattering

D. Engberg 1, L. Börjesson 2, J. Swenson 2, L. M. Torell 1
W. S. Howells 3 and A. Wannberg 4

1 Department of Experimental Physics, Chalmers University of Technology
S-412 96 Göteborg, Sweden
2 Department of Applied Physics, Chalmers University of Technology
S-412 96 Göteborg, Sweden
3 Rutherford-Appleton Laboratory - Chilton, Didcot OX11 0QX, UK
4 Studsvik Neutron Research Laboratory - S-611 82 Nyköping, Sweden

(received 12 November 1998; accepted in final form 13 May 1999)

PACS. 64.70.Pf - Glass transitions.
PACS. 61.12.Ex - Neutron scattering techniques (including small-angle scattering).


The temperature dependence of the non-ergodicity parameter of a strong glass former, B2O3, has been investigated using neutron scattering. A clear change is observed at a temperature ($\sim 800$ K) well above the glass-transition temperature ($\sim 523$ K), and a complementary behaviour is observed for the strength of a fast relaxation process. The results directly shows the existence of a dynamic transition in the super-cooled melt of a strong network glass former. The transition, which is corroborated by the analysis of sound velocity and viscosity data, resembles that predicted by the mode coupling theory, and thereby shows the applicability of this theory even to strong glass formers.


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