Study of the Anelastic Behavior of PZT and PLZT Ferroelectric Ceramics

Abstract

The anelastic behavior of the ferroelectric ceramics (Pb)(Zr/Ti)O3(PZT) and (Pb/La)(Zr/Ti)O3(PLZT), with Zr/Ti = 65/35, La = 5 at.% and 8 at.%, was investigated in the region of the ferroelectric phase transitions. Anelastic spectroscopy experiments were performed in an acoustic elastometer system, operating in a kilohertz bandwidth, at temperatures rising from 300 K to 770 K, at a heating rate of 1 K/min, under pressure of 10-5mbar. Anelastic measurements on PZT showed only one anomaly, associated with the occurrence of a ferroelectric-paraelectric phase transition, while the PLZT data showed two anomalies, which were associated with the following transitions: the ferroelectric-paraelectric phase transition and a ferro-ferroelectric phase transition between distinct rhombohedral ferroelectric phases. The behavior of the relative variation of the elastic moduli with temperature, near the phase transitions, which describes the change in the type of coupling between strain and the order parameter in ferroelectric-paraelectric phase transition, with the increase of lanthanum amount and, linear coupling in the strain and order parameter type to PZT ceramic and linear coupling in the strain but quadratic in order parameter type for PLZT ceramics.

Influence of diffuse phase transition on the anelastic behavior of Nb-doped Pb(Zr0.53Ti0.47)O3 ceramics

“…Several studies, related to the oxygen vacancies, domain walls and phase transitions in ferroelectric ceramics, have employed M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT internal friction (Q −1 ) measurements [5,[10][11][12][17][18][19][20][21][22][23][24][25][26]. Nevertheless, only a few authors [27] have used mechanical spectroscopy to investigate the various processes involved in materials having relaxor behavior and/or DPT, and specially in the thermal evolution of PZTN ceramics, including their ferroelectric-paraelectric diffuse phase transition.…”

Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies

“…The Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 (BNT-BT) solid solution has been considered as a promising and one of the principal candidates for replacements of the PZT. However, some of its basic properties, such as the nature of the phase transitions and the relationship between the electric and mechanic responses [9,10], mainly in the MPB region requires further investigation, which is the purpose of this study. The complementary and supplementary information obtained from loss spectra measured in mechanical spectroscopy [11,12] and dielectric spectroscopy [13,14] is reported in this study.…”

Dielectric relaxations of lead zirconate titanate films up to millimeter‐wave frequencies

“…ρ and d change only minimally with temperature due to thermal expansion and thus cannot account for the change in f 1 . It is difficult to estimate the change in c 55 with heating, but reports in literature indicate a decrease of elastic moduli of about 15% for PZT 65/35 49 or hard‐doped near‐MPB PZT 50 when heating in this temperature range. Even considering the square‐root dependence of $$f_r$$ on c 55 , this is sufficient to account for the decrease in f 1 .…”