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Abstract
Investigation of mesoscopic inhomogeneities caused by the coexistence of FE and AFE phases is carried out in PLLZT solid solutions Pb1−x(Li1/2La1/2)x (Zr1−y Tiy)O3 with x = 0.1 and 0.15, in which the energy difference between FE and AFE states is small. A weak distinction in free energy leads to the coexistence of the said phases domains at temperatures lower than the point of paraelectric phase transition. In the discussed PLLZT solid solutions equivalent crystallographic sites are occupied by ions differing in the size. In the vicinity of the interphase border a process of ions segregation takes place. In the present paper, development of the process of “stratification” of the solid solutions in the course of time is studied. The said process is shown to be entirely completed in the course of 100–120 h.