  The results of the first investigations of the process of local decomposition
of lead-lanthanum zirconate-titanate solid solution in the vicinity of the
interphase boundaries separating domains of coexisting ferroelectric and
antiferroelectric phases are presented. The solid solution with the
composition: 6 at% of La, 73 at% of Zr, and 27 at% of Ti is considered. The
kinetics of the local decomposition of this solid solution in the process of
aging of samples quenched down to room temperature from the paraelectric phase
is studied. The mechanisms that define the kinetics of the process of
establishment of the equilibrium state of coexisting domains of ferroelectric
and antiferroelectric phases are discussed.
