Temperature–field phase diagrams in Pb(Zn1/3Nb2/3)O3–4.5%PbTiO3 II

Coexistence States near the Morphotropic Phase Boundary: II. The Scaling of the Free Energy in PbZr1-xTixO3

“…[10][11][12] Fu and Cohen also reported that a similar mechanism works for such a giant response in BaTiO 3 on the basis of the first-principles studies. 13) In addition, various theoretical investigations 14,15) and experimental results of PZT [16][17][18][19] and Pb(Zn 1=3 Nb 2=3 )-O 3 -PbTiO 3 [20][21][22][23][24] with respect to MPB were reported. Recently, Yokota et al have reported that PZT ceramics in the rhombohedral range always consist of mixed phases, on the basis of the experimental results of X-ray diffraction analysis.…”

Curie constant in relaxor ferroelectrics Pb(Zn1/3Nb2/3)O3–8%PbTiO3

“…After the discovery of the CEP, detailed studies of temperature-field phase diagrams in PMN-xPT and PZN-xPT were carried out by many authors. [8][9][10][11][12][13][14][15] A semiquantitative analysis of such phase diagrams using the Landau-Devonshire free energy was presented. [16][17][18] In our previous studies, [12][13][14][15] we also found that the diffuseness of the phase transition in PZN-xPT considerably decreases when the dc biasing field is applied, implying that reduced heterogeneity owing to the application of electric field may make the phase transition sharp, and concluded that the physical properties of relaxors in the PZN-xPT become more similar to those of normal ferroelectrics under the dc biasing field.…”

“…[8][9][10][11][12][13][14][15] A semiquantitative analysis of such phase diagrams using the Landau-Devonshire free energy was presented. [16][17][18] In our previous studies, [12][13][14][15] we also found that the diffuseness of the phase transition in PZN-xPT considerably decreases when the dc biasing field is applied, implying that reduced heterogeneity owing to the application of electric field may make the phase transition sharp, and concluded that the physical properties of relaxors in the PZN-xPT become more similar to those of normal ferroelectrics under the dc biasing field. 12) This indicates that the Landau-Devonshire free energy should be applicable to explain the phase transition in PZN-xPT under an electric field.…”

Dielectric tunability near critical end point in Pb(Zn1/3Nb2/3)O3–PbTiO3

“…16,17) A similar mechanism for the giant response was also reported in BaTiO 3 on the basis of first-principles studies. 18) In PMN-xPT 19,20) and PZN-xPT [21][22][23][24] solid solution systems, it was reported that the critical end point (CEP) between the paraelectric and ferroelectric phases appears in a small critical field, E CEP , on the temperature-field (T-E) phase diagram. A phenomenological approach was also reported to explain the temperature-field phase diagrams and critical behaviors.…”