Abstract
Ceramics of PbZr1 − x Ti x O3 solid solutions were systematically studied in the range 0.37 ≤ x ≤0.57. The x-T phase diagram of the system is constructed in the range 25°C ≤ T ≤ 650°C. The diagram has a region of an indefinite symmetry in the vicinity of the transition to the nonpolar cubic phase. It is established that solid solutions in this region are characterized by weak distortions and temperature-time instability of the crystal structure. Three concentration regions are separated differing in the value of the jump in the unit cell volume ΔV at the line of transitions from the rhombohedral (tetragonal) phase to the region of indefinite symmetry. It is revealed that there are three temperature ranges differing in the behavior of the temperature dependence of the inverse permittivity, which are due to the existence of two critical Curie points at the boundary separating the ferroelectric phases from the cubic phase.
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Original Russian Text © L.A. Reznichenko, L.A. Shilkina, O.N. Razumovskaya, E.A. Yaroslavtseva, S.I. Dudkina, O.A. Demchenko, Yu.I. Yurasov, A.A. Esis, I.N. Andryushina, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 8, pp. 1469–1475.
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Reznichenko, L.A., Shilkina, L.A., Razumovskaya, O.N. et al. Phase x-T diagram of actual solid solutions of the (1 − x)PbZrO3-xPbTiO3 system (0.37 ≤ x ≤ 0.57). Phys. Solid State 50, 1527–1533 (2008). https://doi.org/10.1134/S1063783408080234
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DOI: https://doi.org/10.1134/S1063783408080234