TEM studies of modified lead zirconate titanate ceramics

1994 ◽  
Vol 52 ◽  
pp. 552-553
Author(s):  
Dwight. Viehland ◽  
Z. Xu ◽  
X. H. Dai
Keyword(s):  
Dielectric Constant ◽  
Single Cell ◽  
Lead Zirconate Titanate ◽  
Ferroelectric Phase ◽  
Lead Zirconate ◽  
Phase Switching ◽  
Compositional Range ◽  
Maximum Dielectric Constant ◽  
Dielectric Maximum ◽  
Titanate Ceramics

The microstructural, structural, dielectric, and polarization properties of antiferroelectric PZST and PLZT ceramics have been studied as a function of Sn and La-contents, respectively. These materials are of interests for applications as antiferroelectric-ferroelectric phase switching actuators, however their transformational characteristics are currently unknown. In these systems, various ferroelectric and antiferroelectric phases have been reported over a narrow compositional range. These include: antiferroelectric orthorhombic, antiferroelectric tetragonal, rhombohedral ferroelectric, multi-cell cubic paraelectric, and single-cell cubic paraelectric. Dielectric anomalies are not observed at the ferroelectric to antiferroelectric or antiferroelectric to multicell cubic transformations. The maximum dielectric constant is found near the temperature of the formation of the multicell cubic state, which is ˜30°C above the transformation into the antiferroelectric tetragonal state. No macroscopic symmetry changes are observed near the temperature of the dielectric maximum.The compositional systems investigated in this study were (Pb1-xLax)(Zr1-yTiy)O3 (PLZT x/(1-y)/y) and Pb(0.98)Nb0.02[(Zr1-x,Snx)1-yTiy]1-zO3 (PZST x/y/2). The compositions chosen for study were PLZT 0/95/, 1/95/5, 2/95/5, 3/95/5 and 5/95, and PZST 45/0/2, 45/3/2, 45/6/2, and 45/9/2.

Dielectric and Ferroelectric Properties of (Cr,Nb)-Doped Lead Zirconate Titanate Ceramics

2009 ◽  
Vol 421-422 ◽  
pp. 385-388
Author(s):  
Piyachon Ketsuwan ◽  
Anurak Prasatkhetragarn ◽  
Supon Ananta ◽  
Chien Chih Huang ◽  
David P. Cann ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Lead Zirconate Titanate ◽  
Ferroelectric Properties ◽  
Rhombohedral Phase ◽  
Lead Zirconate ◽  
Lower Amount ◽  
Maximum Dielectric Constant ◽  
Cr Concentration ◽  
Nb Dopant ◽  
Cr Doping

The 3 mol% Nb2O5 doped Pb(Zr0.52Ti0.48)O3 with addition of 1-3 mol% Cr2O3 prepared via the solid-state reaction technique have been investigated. The XRD shows that a sample is primarily in both tetragonal and rhombohedral phases coexist and the amount of rhombohedral phase decreases that is due to the donor (Nb) dopant reduces the number of oxygen vacancies and leads to a lower amount of rhombohedral phase. The maximum dielectric constant tend to decrease with increasing Cr doping concentration from 0.1 to 1 mol%. Further increase in Cr concentration, the maximum dielectric constant increase dramatically. The hysteresis loop measurements, the electrical coercivity and the remnant polarization do not show a systematic trend at low concentration of Cr doping. It is possibly due to the partial solubility of Cr doping. The observations clearly indicate the hardening behavior at higher concentration because of more solubility of Cr.

Field-induced lead zirconate titanate stannate antiferroelectric-to-ferroelectric phase-switching ceramics

1995 ◽  
Author(s):  
Shoko Yoshikawa ◽  
Numchul Kim ◽  
Thomas R. Shrout ◽  
Qi Ming Zhang ◽  
Paul Moses ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Ferroelectric Phase ◽  
Lead Zirconate ◽  
Phase Switching ◽  
Zirconate Titanate

Lead Zirconate Titanate Stannate Thin Films for Large Strain Microactuator Applications

1991 ◽  
Vol 243 ◽  
Author(s):  
Keith G. Brooks ◽  
Jiayu Chen ◽  
K.R. Udayakumar ◽  
L. Eric Cross
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Ferroelectric Phase ◽  
Large Strain ◽  
Sol Gel ◽  
Bias Field ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Phase Switching ◽  
Sol Gel Process

AbstractThin films of antiferroelectric tetragonal (Pb.97 La.02 )(Zr1-x-yTixSny)O3 have been synthesized from acetate and alkoxide precursors via a sol-gel process. A multiple layer spin coating procedure was used to prepare 0.4 gtm films on platinized silicon wafers. Crystallization of the films as confirmed by x-ray diffraction was achieved by rapid thermal annealing at 700°C for 20 seconds. Antiferroelectric to ferroelectric phase switching threshold fields were determined from P-E hysteresis curves. Longitudinal strain is reported as a function of applied electric field, with a maximum strain of 1.6×10-3 measured at an applied dc bias field of 120 kV/cm on a film of composition Pb.97 La.02 (Zr.60Ti.l0Sn.30 )O3. These films show promise for micromechanical actuator applications due to the high strain associated with field forced antiferroelectric to ferroelectric phase switching.

Convergent-bceam diffraction studies on lead zirconate titanate Ceramics

1986 ◽  
Vol 44 ◽  
pp. 482-483
Author(s):  
M.L.A. Dass ◽  
T.A. Bielicki ◽  
G. Thomas ◽  
T. Yamamoto ◽  
K. Okazaki
Keyword(s):  
Lead Zirconate Titanate ◽  
Direct Proof ◽  
Lead Zirconate ◽  
Subsolidus Phase ◽  
Pzt Ceramics ◽  
Subsolidus Phase Diagram ◽  
Zirconate Titanate ◽  
Two Phases ◽  
Cbd Method ◽  
Titanate Ceramics

Lead zirconate titanate, Pb(Zr,Ti)O3 (PZT), ceramics are ferroelectrics formed as solid solutions between ferroelectric PbTiO3 and ant iferroelectric PbZrO3. The subsolidus phase diagram is shown in figure 1. PZT transforms between the Ti-rich tetragonal (T) and the Zr-rich rhombohedral (R) phases at a composition which is nearly independent of temperature. This phenomenon is called morphotropism, and the boundary between the two phases is known as the morphotropic phase boundary (MPB). The excellent piezoelectric and dielectric properties occurring at this composition are believed to.be due to the coexistence of T and R phases, which results in easy poling (i.e. orientation of individual grain polarizations in the direction of an applied electric field). However, there is little direct proof of the coexistence of the two phases at the MPB, possibly because of the difficulty of distinguishing between them. In this investigation a CBD method was found which would successfully differentiate between the phases, and this was applied to confirm the coexistence of the two phases.

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