Phase Formation in Near-Morphotropic Region
of the PbZr_1xTi_xO₃ System, Structural Defects,
and Electromechanical Properties of the Solid Solutions

L. A. Reznichenko^a, L. A. Shilkina^a, O. N. Razumovskaya^a, E. A. Yaroslavtseva^a, S. I. Dudkina^a,
O. A. Demchenko^a, Yu. I. Yurasov^b, A. A. Esis^a, and I. N. Andryushina^a

^a Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don, 344090 Russia

e-mail: sakh@ip.rsu.ru

^b South-Russia State Technical University (Novocherkassk Polytechnic Institute), Novocherkassk, Rostov oblast, Russia

Received September 16, 2008

Abstract—Ceramics of PbZr_1–xTi_xO₃ solid solutions were systematically studied in the range 0.37 x 0.57.
The x–T phase diagram (T = 25°C) is constructed containing in single-phase regions isosymmetric states char-
acterized by different concentration dependences of the structural and electrophysical parameters. There are
also regions where these states coexist, with their unit cell volume remaining unchanged. The existence of these
states is interpreted in terms of the real (defect) structure of the ceramics. Several reasons are indicated that are
responsible for the appearance of the phase states and related to the crystallochemical peculiarities of the solid
solutions: the alternate valence of titanium ions; the infinitely adaptive structure of titanium dioxide; and the
formation, ordering, and rotation of the planes of crystallographic shear. It is shown that the transition from the
rhombohedral to tetragonal phase occurs indirectly, through two intermediate phases with lower symmetry
whose appearance is favored by the defects in the solid solutions.

PACS numbers: 61.05.cf, 64.60.-i, 77.65.-j, 77.84.Dy

DOI: 10.1134/S1063783409050205

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