Volume 47, Number 2, July II 1999
|Page(s)||213 - 219|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
The liquid-glass transition in a strong network glass former investigated by neutron scattering
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
Accepted: 13 May 1999
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 ( K) well above the glass-transition temperature ( 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.
PACS: 64.70.Pf – Glass transitions / 61.12.Ex – Neutron scattering techniques (including small-angle scattering)
© EDP Sciences, 1999
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