DECOMPOSITION IN AGBR-NABR SINGLE-CRYSTALS

The kinetics of phase separation in AgBr-NaBr has been investigated by time-resolved neutron scattering techniques in powder samples as well as single crystals. Spinodal decomposition observed in SANS experimen ts is dominated by non-linear effects even in the earliest accessible stages and dynamical scaling can be found. By the availability of sing le crystals with concentrations up to 32 at% AgBr it was shown that ev en these crystals can be demixed and mixed periodically without losing their long-range order. The time development of Bragg peaks as well a s the behaviour of some acoustic phonons during the decomposition proc ess are studied by means of time-resolved triple axis spectroscopy.