CHARACTERISTICS OF THE CLUSTERED STRUCTURE OF PB(LI, LA)(ZR1-YTIY)O-3IN THE ANTIFERROELECTRIC-FERROELECTRIC TRANSITION REGION

Mesoscopic inhomogeneities and their influence on the behavior of the physical properties (optical reflectivity, dielectric constant, and Cu rie temperature) of a system of lead zirconate-titanate Pb-0.85(Li1/2L a1/2)(0.15)(Zr1-yTiy)O-3 solid solutions are investigated. It is estab lished that the disruptions of long-range order have a mesoscopic scal e and generate ion groups in the form of interlayers of elements of bi nary-oxide planes coherently embedded in the crystal structure of the host phase. It is shown that the clustering of the structure is manife sted in nonlinearity of the physical properties of the lead zirconate- titanate solid solutions, where the most pronounced variations are cha racteristic of the coexistence region of the antiferroelectric and fer roelectric phases. (C) 1998 American Institute of Physics. [S1063-7842 (98)00802-2].