Dielectric properties and morphotropic phase boundaries in the xPb(Zn1/3Nb2/3)O3−(1−x)Pb(Zr0.5Ti0.5O3 pseudo-binary system

Abstract

Ceramics in the xPb(Zn 1/3 Nb 2/3 )O 3 −(1 − x)Pb(Zr 0.5 Ti 0.5 )O 3 [xPZN-(1 − x)PZT] solid solution system are expected to display excellent dielectric, piezoelectric, and ferroelectric properties in compositions close to the morphotropic phase boundary (MPB). The dielectric behavior of ceramics with x = 0.1−0.6 has been characterized in order to identify the MPB compositions in this system. Combined with X-ray diffraction results, ferroelectric hysteresis measurements, and Raman reflectivity analysis, it was consistently shown that an MPB exists between x = 0.2 and x = 0.3 in this binary system. When x ≤ 0.2, the tetragonal phase dominates at ambient temperatures. In the range of x ≥ 0.3, the rhombohedral phase dominates. For this rhombohedral phase, electrical measurements reveal a profound frequency dispersion in the dielectric response when x ≥ 0.6, suggesting a transition from normal ferroelectric to relaxor ferroelectric between 0.5 ≤ x ≤ 0.6. Excellent piezoelectric properties were found in 0.3PZN-0.7PZT, the composition closest to the MPB with a rhombohedral structure. The results are summarized in a PZN-PZT binary phase diagram. N. Vittayakorn ( )

Development of perovskite and phase transition in lead cobalt niobate modified lead zirconate titanate system

“…It is interesting to note that the influence of the addition of Pb(Co 1/3 Nb 2/3 )O 3 on the phase transition of the Pb(Zr 1/2 Ti 1/2 )O 3 system is similar to that of Pb(Zr 1/2 Ti 1/2 )O 3 -Pb(Ni 1/3 Nb 2/3 )O 3 , Pb(Zr 1/2 Ti 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 and Pb(Zr 1/2 Ti 1/2 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 systems [6,[17][18][19].…”

Measurement of thermal strain and total polarization estimation of lead zirconate titanate–lead zinc niobate ceramics

“…For the higher PZN content compositions, the properties follows the relaxor ferroelectric PZN. These results are consistent with the dielectric and ferroelectric properties of PZT-PZN ceramics [16][17][18].…”

“…As both PZT and PZN possess excellent electrical properties, enhanced properties can thus be expected from ceramics in PZT-PZN system. There have been many previous reports on the electrical properties of PZT-PZN ceramics [16][17][18]. In this study, we studied thermal expansion behavior of (1 -x)PZT-(x)PZN (x = 0.1, 0.2, 0.3, 0.4, and 0.5) ceramics.…”

The variation of Curie temperature and dielectric relaxor behaviour in the nominal (1-x)BaTiO3-xBiAlO3 system

“…Although this law is often broken and the theoretical backing needs to be further clarified, in some instances, it serves as a useful rule and also can be extended to the more complicated system with multiplicity of phases, such as (1-x)PNN-xPZT [12], (1-x)PZN-xPZT [13] and (1-x) KNN-xLiNbO 3 [14]. So there aroused the suspicions that what is the main reason responsible for the large deviation of Curie temperature from Vegard's law in the reported BiAlO 3 based system [7][8][9][10].…”