Homogeneous nucleated annihilation of the 2q phase in ${\mathrm{Cu}}_{0.78}$${\mathrm{Pd}}_{0.22}$

The kinetics of the phase transition in ${\mathrm{Cu}}_{0.78}$${\mathrm{Pd}}_{0.22}$ from the two-dimensional to the one-dimensional long-period structure (2q to 1q) has been investigated by time-resolved x-ray scattering. Over a period of two-and-a-half decades an exponential-decay law is accurately obeyed. Model considerations of bulk and interfacial annihilation at the 1q-2q interface shows that the annihilation is bulk and not interfacial driven.