Ferroelectric and Piezoelectric Properties of (1-x)BaTi0.8Zr0.2O3-xBa0.7Ca0.3TiO3 Ceramics Prepared by Sol-Gel Technique

2010 ◽  
Vol 148-149 ◽  
pp. 1480-1485 ◽  
Author(s):  
Zhong Wen Tan ◽  
Wei Guo Fu ◽  
Xiang Yun Deng ◽  
Ren Bo Yang ◽  
Xiao Fen Guan ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Piezoelectric Response ◽  
Maximum Dielectric Constant ◽  
Gel Technique ◽  
Sintered Temperature ◽  
Ferroelectric And Piezoelectric Properties

The(1-x)BaTi0.8Zr0.2O3-xBa0.7Ca0.3TiO3 ceramics have been prepared by sol-gel technique, where x is from 0.2 to 0.6. It reveals that the dense ceramics can be obtained when the sintered temperature is above 1250°C. It is lower than that of solid state reaction ceramics. In particular, when x=0.3, at which is near the MPB composition, the ferroelectric and piezoelectric properties are more excellent than the others. The maximum dielectric constant is above 9000, which can be observed in the butterfly shape curves of dielectric constant as a function of electric field. The maximum piezoelectric coefficient d33 can reach 400 pm/V, and it is obtained from the piezoelectric response loops.

Effect of Sintering Temperature on Structure and Electric Properties of (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 Ceramics

2015 ◽  
Vol 655 ◽  
pp. 141-146
Author(s):  
Xin Guan ◽  
Xiang Yun Deng ◽  
Jian Hao ◽  
Guang Hao Sun ◽  
Chuang Jun Huang
Keyword(s):  
Dielectric Constant ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Calcium Titanate ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
Maximum Dielectric Constant ◽  
Gel Technique

Barium calcium titanate (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 ferroelectric ceramics were prepared by sol–gel technique. The ceramics were sintering at 1290°C-1370°C. X-ray diffraction was employed to investigate the microstructure, and the surface topography was investigated by SEM graphs. The dielectric constant vs temperature was measured by Temperature dielectric spectrometer, and TF Analyzer 2000 measured the ferroelectric properties. It can be found that all the ceramics show pure perovskite structure suggesting that solid solution were formed. SEM showed that the samples uniform in grain size at 1330 °C. Our study revealed that when the sintering temperature is 1330 °C the maximum dielectric constant was 29,600, the maximum piezoelectric coefficient d33 could reach 399pm/V and the remanent polarization (Pr) was 8.3 μc/cm2, respectively.

Effect of Additive Glycerol on Piezoelectric Properties of Modified Sol-Gel (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 Ceramics

2020 ◽  
Vol 993 ◽  
pp. 791-798
Author(s):  
Haibibu Aziguli ◽  
Tao Zhang ◽  
Ping Yu
Keyword(s):  
Grain Size ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Environmental Concern ◽  
Sol Gel ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Electromechanical Coupling Coefficient ◽  
Ceramic Powders

Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZ) ceramics, one of the lead-free pizoelectric materials, were focused due to the environmental concern against lead. A modified BCTZ powder sol-gel fabrication process was experimentally introduced with the addition of glycerol, in order to provide an effective approach to optimize the piezoelectric response of BCTZ ceramics. The results showed that the piezoelectric properties enhanced in terms of the piezoelectric coefficient of d33, 510 pC/N and the electromechanical coupling coefficient of kp, 0.501. The enhancement in electrical properties, such as dielectric, ferroelectric and piezoelectric, could be related to the homogenous microstructure and larger grain size of BCTZ ceramic powders after the introduction of glycerol during the modified sol-gel strategy.

PROCESSING AND PROPERTIES OF Na0.5Bi0.5TiO3 PIEZOELECTRIC CERAMICS MODIFIED WITH La, Mn AND Fe

2010 ◽  
Vol 03 (01) ◽  
pp. 45-48 ◽  
Author(s):  
ELENA AKSEL ◽  
HUMBERTO FORONDA ◽  
KYLE A. CALHOUN ◽  
JACOB L. JONES ◽  
SILKE SCHAAB ◽  
...  
Keyword(s):  
Solid State ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Defect Chemistry ◽  
Systematic Investigation ◽  
The Other ◽  
Lead Free ◽  
Ferroelectric And Piezoelectric Properties ◽  
Iron And Manganese

Although a great deal of work has been done to understand defect chemistry in "soft" and "hard" PZT-based materials, there is little understanding of how defect chemistry influences the properties of lead-free piezoelectric materials. This paper reports a systematic investigation of doping on the ferroelectric and piezoelectric properties in Na 0.5 Bi 0.5 TiO 3 (NBT)-based ceramics. NBT-based ceramics have been synthesized by traditional solid state routes using several different dopants including lanthanum, manganese, and iron in 1 mol%. The addition of iron and manganese lead to an increase in the coercive field (E c ), a decrease in the piezoelectric coefficient (d33), and an increase in the thermal depoling temperature (T depole ), similar to the behavior of "hard" PZT. Lanthanum, on the other hand, leads to a decrease in the E c , an increase in d33, and a decrease in T depole similar to that seen in "soft" PZT.

scholarly journals Ferroelectricity and Large Piezoelectric Response of AlN/ScN Superlattice

2018 ◽  
Author(s):  
Mohammad Noor-A-Alam ◽  
Oskar Olszewski ◽  
Michael Nolan
Keyword(s):  
Density Functional ◽  
Tensile Strain ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Piezoelectric Response ◽  
Functional Theory ◽  
Epitaxial Strain ◽  
Biaxial Tensile Strain ◽  
Ferroelectric And Piezoelectric Properties ◽  
External Strain

Based on density functional theory, we investigate the ferroelectric and piezoelectric properties of the AlN/ScN superlattice. We find that the polar wurzite (w-ScAlN) structure is mechanically and dynamically stable, and is more stable than the nonpolar hexagonal flat configuration. We show that ferroelectric polarization switching can be possible for epitaxially tensile strained superlattice. Due to the elastic constant C33 softening along with an increase in e33, the piezoelectric coefficient d33 of the superlattice is doubled compared to pure w-AlN. The combined enhancement of Born effective charges (Z33) and the sensitivity of the atomic co-ordinates to external strain (\frac{\partial u_{3}}{\partial\eta_{3}}) is the origin of large piezoelectric constant e33. Moreover, we show that epitaxial biaxial tensile strain significantly enhances the piezo-response, so that d33 is seven times larger than that of w-AlN at 4% strain. The tensile strain results in a huge enhancement in e33by increasing Z33 and \frac{\partial u_{3}}{\partial\eta_{3}}, which boosts the piezoelectric coefficient. As both superlattice growth and epitaxial strain are already experimentally demonstrated in wurzite nitrides, our results show a new, more controlled approach to significantly enhance and tune the piezoelectric response of w-AlN materials.

Dielectric, ferroelectric, and piezoelectric properties of (001) BiScO3–PbTiO3 epitaxial films near the morphotropic phase boundary

2004 ◽  
Vol 19 (2) ◽  
pp. 568-572 ◽  
Author(s):  
Juan C. Nino ◽  
Susan Trolier-McKinstry
Keyword(s):  
Dielectric Constant ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Piezoelectric Properties ◽  
Hysteresis Loops ◽  
Epitaxial Films ◽  
Device Development ◽  
Maximum Dielectric Constant ◽  
Room Temperature Dielectric Constant ◽  
Ferroelectric And Piezoelectric Properties

The dielectric, ferroelectric, and piezoelectric properties of (001) BiScO3–PbTiO3 epitaxial films near the morphotropic phase boundary were investigated. Epitaxial films, 1-μm thick, were grown on (100) SrRuO3/(100) LaAlO3 substrates by pulsed laser deposition from a BiScO3–PbTiO3 (40/60) ceramic target. The films had room temperature dielectric constant of 850, tanδ = 0.08, and maximum dielectric constant of 5530 at 455 °C. Well-saturated hysteresis loops with a remanent polarization of 42 μC/cm2 and a coercive field of 75 kV/cm were observed. The effective transverse piezoelectric coefficient e31,f was −12 C/m2. This result is quite encouraging for sensor and actuator device development because the observed piezoelectric properties are as good as (001) oriented Pb(Zr,Ti)O3 films (e31,f ∼ –12 C/m2) while the transition temperature is 100 °C higher.

scholarly journals Ferroelectricity and Large Piezoelectric Response of AlN/ScN Superlattice

2018 ◽  
Author(s):  
Mohammad Noor-A-Alam ◽  
Oskar Olszewski ◽  
Michael Nolan
Keyword(s):  
Density Functional ◽  
Tensile Strain ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Piezoelectric Response ◽  
Functional Theory ◽  
Epitaxial Strain ◽  
Biaxial Tensile Strain ◽  
Ferroelectric And Piezoelectric Properties ◽  
External Strain

Based on density functional theory, we investigate the ferroelectric and piezoelectric properties of the AlN/ScN superlattice. We find that the polar wurzite (w-ScAlN) structure is mechanically and dynamically stable, and is more stable than the nonpolar hexagonal flat configuration. We show that ferroelectric polarization switching can be possible for epitaxially tensile strained superlattice. Due to the elastic constant C33 softening along with an increase in e33, the piezoelectric coefficient d33 of the superlattice is doubled compared to pure w-AlN. The combined enhancement of Born effective charges (Z33) and the sensitivity of the atomic co-ordinates to external strain (\frac{\partial u_{3}}{\partial\eta_{3}}) is the origin of large piezoelectric constant e33. Moreover, we show that epitaxial biaxial tensile strain significantly enhances the piezo-response, so that d33 is seven times larger than that of w-AlN at 4% strain. The tensile strain results in a huge enhancement in e33by increasing Z33 and \frac{\partial u_{3}}{\partial\eta_{3}}, which boosts the piezoelectric coefficient. As both superlattice growth and epitaxial strain are already experimentally demonstrated in wurzite nitrides, our results show a new, more controlled approach to significantly enhance and tune the piezoelectric response of w-AlN materials.

scholarly journals Transferred PMN-PT Thick Film on Conductive Silver Epoxy

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1621 ◽  
Author(s):  
Tao Zhang ◽  
Jun Ou-Yang ◽  
Xiaofei Yang ◽  
Benpeng Zhu
Keyword(s):  
Thick Film ◽  
Silicon Substrate ◽  
Chemical Method ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Wet Chemical Method ◽  
Chemical Route ◽  
Wet Chemical ◽  
Silver Epoxy ◽  
Ferroelectric And Piezoelectric Properties

Approximately 25 μm Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) thick film was synthesized based on a sol-gel/composite route. The obtained PMN-PT thick film was successfully transferred from the Silicon substrate to the conductive silver epoxy using a novel wet chemical method. The mechanism of this damage free transfer was explored and analyzed. Compared with the film on Silicon substrate, the transferred one exhibited superior dielectric, ferroelectric and piezoelectric properties. These promising results indicate that transferred PMN-PT thick film possesses the capability for piezoelectric device application, especially for ultrasound transducer fabrication. Most importantly, this chemical route opens a new path for transfer of thick film.

scholarly journals Piezoelectric Properties of SrBi4Ti4O15 Ferroelectric Ceramics

2002 ◽  
Vol 17 (6) ◽  
pp. 1376-1384 ◽  
Author(s):  
Marlyse Demartin Maeder ◽  
Dragan Damjanovic ◽  
Cyril Voisard ◽  
Nava Setter
Keyword(s):  
Piezoelectric Coefficient ◽  
Domain Walls ◽  
High Pressures ◽  
Elevated Temperatures ◽  
Piezoelectric Properties ◽  
Ferroelectric Ceramics ◽  
Piezoelectric Response ◽  
Low Frequencies ◽  
Sintering Conditions ◽  
Weak Fields

The dynamic piezoelectric response of SrBi4Ti4O15 ceramics with Aurivillius structure was investigated at high alternating stress, low frequencies (0.01 to 100 Hz), and temperatures from 20 to 200 °C. The piezoelectric nonlinearity, observed only at high pressures (>10 MPa) and elevated temperatures (>150 °C), is interpreted in terms of contributions from non-180° domain walls. At weak fields, the frequency dependence of the longitudinal piezoelectric coefficient was explained in terms of Maxwell–Wagner piezoelectric relaxation. The Maxwell–Wagner units are identified as colonies that consist of highly anisotropic grains which sinter together, and whose distribution in the ceramic is strongly dependent on sintering conditions.

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