Sol-Gel Transparent PLZT Ferroelectric Ceramics

2006 ◽  
Vol 45 ◽  
pp. 2489-2494 ◽  
Author(s):  
M. Płońska ◽  
Wojciech A. Pisarski ◽  
Zbigniew Pędzich ◽  
Zygmunt Surowiak
Keyword(s):  
Infrared Spectroscopy ◽  
Mercury Porosimetry ◽  
Sol Gel ◽  
Ferroelectric Ceramics ◽  
Ceramic Powders ◽  
Lead Lanthanum Zirconate Titanate ◽  
Lanthanum Zirconate ◽  
Pressing Method ◽  
Fine Grained ◽  
To Receive

Lead lanthanum zirconate titanate (known as PLZT) ceramic powders have been prepared by the modified sol – gel method, and underwent consolidation by the hot uniaxial pressing method. Application of such technique of preparation permitted to receive fine-grained transparent PLZT x/65/35 ceramics, with x = 8 -10 La at.%. The present publication gives a detailed account of the relationships between technology and physical properties of obtained materials. To analyze all ceramics SEM, EDS and mercury porosimetry were performed, and dielectric properties were studied too. Quite wide light transparency from the visible to nearinfrared range for PLZT ceramics was detected using optical absorption and infrared spectroscopy.

Characterization of Lead Lanthanum Zirconate Titanate Ceramics Co-Doped with Lanthanide Ions

2016 ◽  
Vol 98 ◽  
pp. 75-81 ◽  
Author(s):  
Malgorzata Plonska ◽  
Jolanta Dzik
Keyword(s):  
Lanthanide Ions ◽  
Oxide Materials ◽  
Ceramic Powders ◽  
Lead Lanthanum Zirconate Titanate ◽  
Lanthanum Zirconate ◽  
Pressing Method ◽  
Ceramic Samples ◽  
Titanate Ceramics ◽  
Co Doped

The aim of this work was to obtain Pb0.92(La0.08)(Zr0.65Ti0.35)0.98O3 materials co-doped with two different lanthanide ions (Ln3+) and characterization how they influence on the physical properties of prepared 8/65/35 PLZT: Ln3+ ceramics. As a co-dopant, praseodymium (Pr3+) and neodymium (Nd3+) ions were used at the concentration of 0.0 and 0.5 wt.% respectively. The ceramic powders of 8/65/35 PLZT, PLZT:Pr3+ as well PLZT:Nd3+ were synthesized by conventional ceramic route, from high purity raw oxide materials (>99,9%). All compositions of the ceramic samples were sintered via single time process at Ts=1200°C/3h, by the hot uniaxial pressing method. Performed measurements have shown dependence of used dopant on structure, microstructure, and dielectric as well optical properties of the fabricated 8/65/35 PLZT: Ln3+ materials.

scholarly journals Piezoelectric characterization of lead-free ferroelectric ceramics

2010 ◽  
Vol 4 (3) ◽  
pp. 199-207 ◽  
Author(s):  
Lorena Pardo ◽  
Alvaro García ◽  
Klaus Brebøl ◽  
Lavinia Curecheriu ◽  
Liliana Mitoseriu ◽  
...  
Keyword(s):  
Sol Gel ◽  
Complex Impedance ◽  
Experimental Spectrum ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Coarse Grained ◽  
Shear Mode ◽  
Fine Grained ◽  
Accuracy Test

The challenge to develop high piezoelectric sensitivity and lead-free composition ferro-piezoelectric ceramics has recently dragged new attention to some classic ferroelectrics. Here, Ba(CexTi1-x)O3 (Ce-BT) and 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO3 (BNBT6) ceramics were piezoelectrically characterized from measurements of complex impedance at electromechanical resonances and their analysis by Alemany et al. software. The reconstruction of the spectra for each resonance is used as an accuracy test of the set of calculated coefficients, quantitatively characterized by the regression factor (R2) of such reconstruction to the experimental spectrum. Piezoelectric activity at room temperature (RT) was observed for Ce-BT with x=0.06 and 0.1, ferroelectrics with T(?'max)>RT, but also for x=0.2 with T(?'max)<RT, which confirms its relaxor character (Ps?0 for T?T(?'max)). BNBT6 fine grained ceramics (~1 ?m) were prepared from nanopowder obtained by sol-gel autocombustion. Results obtained for the fine grained ceramic hot-pressed at 800?C for 2 h and recrystallized at 1050?C for 1 h are d33=148 pCN-1 and kp=26.8%. Despite of its lower grain size, the properties of this material are comparable with those reported for coarse grained ceramics obtained by sintering at T>1100?C. Some measurement issues, as the role of the mode coupling on the characterization results, illustrated for the shear mode of a thickness poled plate, are discussed.

Epitaxial growth of sol-gel PLZT thin films

1994 ◽  
Vol 9 (2) ◽  
pp. 420-425 ◽  
Author(s):  
Dae Sung Yoon ◽  
Chang Jung Kim ◽  
Joon Sung Lee ◽  
Won Jong Lee ◽  
Kwangsoo No
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Lead Lanthanum Zirconate Titanate ◽  
Lanthanum Zirconate ◽  
Heat Treated ◽  
Pole Figures ◽  
Insertion Method ◽  
Plzt Thin Films ◽  
Organic Solutions

Epitaxial lead lanthanum zirconate titanate [PLZT(9/50/50)] thin films were fabricated on various single crystal substrates using the spin coating of metallo-organic solutions. The films were heat-treated at 700 °C for 1 h using the direct insertion method. The films were epitaxially grown with (100), (100), and (110) being parallel to the SrTiO3(100), the MgO(100), and the sapphire (0112) substrates, respectively. The epitaxy of the films was investigated using x-ray diffraction, pole figures, rocking curves, and scanning electron microscopy.

Charge Trapping Centers in Ferroelectric Ceramics

1992 ◽  
Vol 284 ◽  
Author(s):  
C. H. Seager ◽  
W. L. Warren ◽  
B. A. Tuttle ◽  
R. D. Nasby ◽  
D. Dimos
Keyword(s):  
Uv Light ◽  
Charge Trapping ◽  
Ferroelectric Ceramics ◽  
Electrical Measurements ◽  
Lead Lanthanum Zirconate Titanate ◽  
Paramagnetic Resonance ◽  
Lanthanum Zirconate ◽  
Polarization Electric Field ◽  
Crystal Field Parameters ◽  
Electron Paramagnetic

ABSTRACTElectron paramagnetic resonance (EPR), photo-thermal deflection spectroscopy (PDS), and electrical measurements have been used to characterize as-received and UV-lluminated lead lanthanum zirconate titanate (PLZT) and PZT ceramics. Following optical illumination we observe the activation of positively charged Pb+3 and negatively charged Ti+3 ions, as well as an increased broad absorption peak around 2.6 eV. The spatial distribution of the induced absorption correlates well with the location of the absorbed UV, suggesting that photo-produced carrier pairs are trapped at Ti+4 and Pb+2 producing the observed paramagnetism. The Ti+3 EPR spectra were successfully fit using the crystal field parameters derived from the PDS spectra. Preliminary results suggest that these charged paramagnetic ions can influence the electrical properties of PZT thin films. We investigated the effects of UV light and dc bias sequences by polarization-electric field (PE) measurements and find that the coercive fields are dependent on the sign of the applied bias during UV exposure. It is reasonable to expect that Pb+3 and/or Ti+3 ions act as the charge trapping sites which cause the threshold voltage shifts in the PE loop.

SEM and Auger studies of a PLZT thin film

1993 ◽  
Vol 8 (2) ◽  
pp. 245-248 ◽  
Author(s):  
Kwangsoo No ◽  
Dae Sung Yoon ◽  
Jae Myung Kim
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Energy Shift ◽  
Lead Lanthanum Zirconate Titanate ◽  
Cross Sectional ◽  
Lanthanum Zirconate ◽  
Lower Oxygen ◽  
Auger Spectra ◽  
Plzt Thin Film ◽  
Two Phases

The microstructure and the composition profile of lead lanthanum zirconate titanate thin film fabricated using the sol-gel method were analyzed using the scanning electron microscope and scanning Auger microscope. The PLZT thin film consists of micron-scale spheroidal perovskite grains and nano-scale pyrochlore grains. The perovskite grain has a higher lead and lower oxygen and zirconium contents than the pyrochlore grain. The Auger spectra of the two phases were similar except for energy shift and extra fine structure of oxygen peaks. The Auger depth profile and SEM observation of the cross-sectional fracture surface showed higher perovskite content near the interface between PLZT and ITO films than the surface of the PLZT film.

Effect of Nd3+ concentration quenching in highly doped lead lanthanum zirconate titanate transparent ferroelectric ceramics

2007 ◽  
Vol 101 (5) ◽  
pp. 053111 ◽  
Author(s):  
A. S. S. de Camargo ◽  
C. Jacinto ◽  
L. A. O. Nunes ◽  
T. Catunda ◽  
D. Garcia ◽  
...  
Keyword(s):  
Concentration Quenching ◽  
Ferroelectric Ceramics ◽  
Lead Lanthanum Zirconate Titanate ◽  
Lanthanum Zirconate ◽  
Zirconate Titanate

Electro-optic phenomena

2004 ◽  
Author(s):  
Robert E. Newnham
Keyword(s):  
Light Intensity ◽  
Electric Field ◽  
Electric Fields ◽  
Communication Systems ◽  
Ferroelectric Ceramics ◽  
Refractive Indices ◽  
Lead Lanthanum Zirconate Titanate ◽  
Lanthanum Zirconate ◽  
The Third ◽  
Electro Optic

Optical beams can be controlled by manipulating the refractive indices and absorption coefficients with applied electric fields. In communication systems electro-optic effects are used in phase and amplitude modulation, in beam deflectors, and in tunable filters. Three such effects are illustrated in Fig. 28.1. Lead lanthanum zirconate titanate (PLZT) is a transparent electroceramic that can be prepared in several different ferroelectric forms with large electro-optic coefficients. When prepared in a normal ferroelectric form it can be used in two different ways. A light-tunable shutter is constructed by coating a multidomain ceramic of PLZT with a photoconducting layer and transparent electrodes. A bias voltage on the electrodes is transferred to the ceramic when the photoconductor is illuminated. The electric field alters the domain structure and the degree of light scattering, controlling the intensity of light. Fully poled ferroelectric ceramics exhibit the linear electro-optic effect Using planar electrodes the PLZT is poled perpendicular to the optical beam. Polarizer and analyzer are positioned in the ±45◦ positions, and light intensity is controlled by altering the birefringence with an electric field. The third experiment utilizes a pseudo-cubic PLZT composition with a large quadratic electro-optic effect. No poling is required in this case. With polarizer and analyzer again in the ±45◦ positions, the transmitted light intensity is proportional to E2 rather than E. Linear and quadratic electro-optic coefficients are defined in terms of the fieldinduced changes in the optical indicatrix: . . . Bij(E) − Bij(0) = Δ

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