Abstract
The structural relaxation of viscous (Na 2O–Li 2O)–2P 2O 5 is investigated by neutron spin-echo experiments. The spectra show stretching and time–temperature scaling as known from α-relaxation in supercooled liquids and derived from mode-coupling theory (MCT). The momentum transfer dependence of the correlation times is found to exhibit a maximum value at the first maximum of the structure factor S( Q) in agreement with predictions of MCT. In contrast, the Q-dependence of the stretching exponent β does not seem to oscillate in phase with S( Q) in this network glass.
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