Heterogeneous Ferroelectric Solid Solutions by Vitaly Yu. Topolov

Author:Vitaly Yu. Topolov
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

(3.6)

Fig. 3.6Domain state–interface diagrams calculated for the electric-field-induced tetragonal–MA phase transition in PZN–0.045PT SCs with E || [001]. Graphs (a), (b) and (c) correspond to the volume fraction of the 90° domains n T = 0.90, 0.95 and 0.99, respectively. Conditions (1.​14) and (1.​16) are valid in regions I and III, respectively (reprinted from paper by Topolov et al. [21], with permission from the American Institute of Physics)

Earlier we mentioned elastic matching of the untwined antiferroelectric P2221 and Pba2 phases in PbHfO3 SCs and elastic matching of the untwined FE P4mm and Cm phases in PZT (see Sect. 2.​1.​2)—in both materials conditions (1.​18) for ZNSPs are valid at E = 0. An examination of experimental data [36] shows that the unit-cell parameters of PZT with x = 0.46 (i.e. a composition just at the MPB between the tetragonal and MA phases) obey conditions (3.6). However, contrary to conditions (3.6), the perovskite unit-cell parameter b of PbHfO3 undergoes a jump at the first-order phase transition P2221 → Pba2 [37].

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