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- Caponi, S., et al.
(author)
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The Debye-Waller factor approaching the glass-transition temperature in phosphate glasses
- 2006
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In: Journal of Non-Crystalline Solids. - : Elsevier BV. - 0022-3093. ; 352:42-49 SPEC. ISS., s. 4577-4582
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Journal article (peer-reviewed)abstract
- The temperature dependence of the mean square displacement, 〈u2〉, calculated by elastic neutron scattering for two phosphate glasses, (AgI)x(AgPO3)1-x with x = 0.3, 0.55, is analysed. The studied samples are probed in a wide range of temperatures going from a few tens of K up to the glass transition temperature and well into the undercooled liquid state. In the low temperature regime a solid like behaviour appears, showing a linear temperature dependence of the Debye-Waller factor, while around Tg the onset of a pronounced increase of 〈u2〉 is observed. The temperature dependence of the normalized elastic intensity and the drawn out Debye-Waller factor are fitted and analyzed by the theoretical previsions of Mode Coupling Theory finding a good agreement. © 2006 Elsevier B.V. All rights reserved.
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