Electrical Properties and Piezoelectric Properties of CaBi2Ta2O9-Based Ceramics

2009 ◽  
Vol 421-422 ◽  
pp. 46-49 ◽  
Author(s):  
Toji Tokusu ◽  
Hirokazu Miyabayashi ◽  
Yuji Hiruma ◽  
Hajime Nagata ◽  
Tadashi Takenaka
Keyword(s):  
Wall Motion ◽  
Remanent Polarization ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Domain Wall Motion ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Higher Temperature ◽  
Increasing Temperature ◽  
Curie Temperature Tc

Electrical and piezoelectric properties of CaBi2Ta2O9-based ceramics have been studied. Temperature dependence of dielectric properties indicated that the Curie temperature, TC, was 923°C. Coercive field, EC, and remanent polarization, Pr, became saturated with increasing temperature. It is expected that higher-temperature than 250°C could promote the domain wall motion during the poling treatment. From resonance and antiresonance measurements, piezoelectric properties such as the maximum phase, max, electromechanical coupling factor, k33, and piezoelectric g constant, g33, were 86.1º, 0.085 and 8.4 × 10-3 V∙m/N, at room temperature, respectively.

Piezoelectric Properties and Depolarization Temperature of NaNbO3-LiNbO3 Lead-Free Piezoelectric Ceramics

2008 ◽  
Vol 388 ◽  
pp. 233-236 ◽  
Author(s):  
Rintaro Aoyagi ◽  
Makoto Iwata ◽  
Masaki Maeda
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Thermal Hysteresis ◽  
Longitudinal Mode ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Depolarization Temperature ◽  
Higher Temperature ◽  
Curie Temperature Tc

Piezoelectric and dielectric properties of (LixNa1-x)NbO3 (LNN100x; x≤0.14) ceramics were investigated according to phase transition The highest electromechanical coupling factor, kp, of 0.247 was obtained for LNN12 which has a composition with a morphotropic phase boundary at room temperature. On the other hand, the coupling factor of k33 with longitudinal mode was almost constant for all compositions of x. The dielectric constant, ε r, before poling treatment exhibited a thermal hysteresis near the Curie temperature, TC, for all compositions. The depolarization temperature of LNN6 was higher than the TC before poling treatment. In addition, the peak of free permittivity, ε33 T, was shifted to higher temperature. It was considered that the phase transition was induced by the electric field during poling treatment.

Processing and Electrical Properties of KNbO3 Ferroelectric Dense Ceramics Added with Small Amount of Bi2O3 and MnCO3

2006 ◽  
Vol 301 ◽  
pp. 19-22 ◽  
Author(s):  
Takeru Yoshida ◽  
Hajime Nagata ◽  
Tadashi Takenaka
Keyword(s):  
Electrical Properties ◽  
Grain Growth ◽  
Remanent Polarization ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Hysteresis Loops ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Milling Process ◽  
Firing Process

Doping a small quantity of additive Bi2O3 is effective in suppressing the deliquescence of KNbO3 ceramics. When an optimized ball-milling process was included, dense and nondeliquescent KNbO3 ceramics were obtained by a conventional firing process. However, the presence of Bi prevented grain growth (<0.2 μm) and it was one of the causes of low ferroelectricity. Moreover, the insufficient resistivity made the poling treatment difficult. In order to improve the electric properties, a small quantity of additive MnCO3 was also doped into KNbO3 with 0.5 mass% Bi2O3. Codoping of KNbO3 with MnCO3 and Bi2O3 (abbreviated to KNBixMny; x = 0~1.0, y = 0~1.0 in mass%) improved the ferroelectricity of samples, and it also had an effect on the resistivity and densification of sintered bodies. Well-saturated P-E hysteresis loops were observed with any amount of Mn and the largest remanent polarization Pr was about 16 μC/cm2. The piezoelectric properties of KNBi0.5Mn0.3, which had the highest piezoelectricity in this study, are an electromechanical coupling factor k33 and piezoelectric constant d33 of 0.30 and 101 pC/N, respectively.

Influence of Poling Conditions on the Characteristics of PZT Ceramics

2011 ◽  
Vol 284-286 ◽  
pp. 1375-1380 ◽  
Author(s):  
Ming Cheng Chure ◽  
Ping Cheng Chen ◽  
Long Wu ◽  
Bing Huei Chen ◽  
King Kung Wu
Keyword(s):  
Dielectric Constant ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Poling Field ◽  
Pzt Ceramics ◽  
Poling Process ◽  
Poling Temperature ◽  
Higher Temperature ◽  
Planar Electromechanical Coupling Factor

In the poling process of PZT ceramics, the poling temperature is a critical condition. When the poling temperature is too low, no matter how high is the poling field and how long is the poling time, the planar electromechanical coupling factor kpis lower. When the poling temperature is higher enough, the kpcan reach to a saturated value with a lower poling field and short poling time. The variation of dielectric constant with the poling conditions is the same as that of planar electromechanical coupling factor. When poling with a low temperature, the dielectric constant after poling is lower than 1400. When poling with higher temperature, no matter how high is the poling field and how long is the poling time, the dielectric constant after poling is higher than 1500.

The Effects of Ba(Zr0.05Ti0.95)O3 Addition on Piezoelectric Properties and Microstructures of (Na0.5Bi0.5)0.94Ba0.06TiO3 Ceramics

2017 ◽  
Vol 732 ◽  
pp. 69-75
Author(s):  
Tai Kuang Lee ◽  
Jyun Hung Chen ◽  
Ying Chieh Lee
Keyword(s):  
Phase Transition ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Doping Content ◽  
Remarkable Effect ◽  
Significant Change

(Na0.5Bi0.5)0.94Ba0.06TiO3 (NBBT) ceramics doped with 0.1∼2.0 mol.% Ba (Zr0.05Ti0.95)O3 were investigated in terms of the sintering, microstructure, phase transition, and piezoelectric properties. BZT doping has no remarkable effect on the microstructure and densification within the studied doping content. Up to 2 mol.% BZT can dissolve into the lattice of NBBT ceramics, and the structure symmetry is not changed. However, a significant change in the piezoelectric properties took place. The piezoelectric coefficient d33 for the 0.1 wt.% BZT-doped NBBT ceramics sintered at 1150 °C was found to be 120 pC/N and the electromechanical coupling factor kp = 0.24.

Investigation on Electrical Properties of CaCu3Ti4O12-Modified (Na,Bi)TiO3-BaTiO3 Lead Free Piezoceramics

2014 ◽  
Vol 887-888 ◽  
pp. 289-293
Author(s):  
Jing Chang Zhao ◽  
Zhen Lai Zhou
Keyword(s):  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Mechanical Quality Factor ◽  
Lead Free ◽  
Lead Free Ceramics ◽  
Structure Morphology

(Na,Bi)TiO3-BaTiO3lead free piezoelectric ceramics were fabricated with modification of CaCu3Ti4O12additives. The phase structure, morphology, dielectric and piezoelectric properties of prepared samples were investigated, respectively. It was found that CaCu3Ti4O12additives evidently improve the polarization properties of (Na,Bi)TiO3-BaTiO3lead free ceramics and the obtained samples exhibit an excellent piezoelectric properties (electromechanical coupling factorKp=31%, mechanical quality factorQm=151 and piezoelectric constantd33=160pC/N). According to results, the effect of CaCu3Ti4O12additives on electrical properties of (Na,Bi)TiO3-BaTiO3lead free piezoelectric ceramics is discussed.

scholarly journals High piezoelectricity after field cooling AC poling in temperature stable ternary single crystals manufactured by continuous-feeding Bridgman method

2021 ◽  
Vol 11 (1) ◽  
pp. 57-65
Author(s):  
Cong Luo ◽  
Tomoaki Karaki ◽  
Zhuangkai Wang ◽  
Yiqin Sun ◽  
Yohachi Yamashita ◽  
...  
Keyword(s):  
Single Crystals ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Wide Range ◽  
Device Applications ◽  
Continuous Feeding ◽  
High Dielectric ◽  
Field Cooling

AbstractAfter field cooling (FC) alternating current poling (ACP), we investigated the dielectric and piezoelectric properties of [001]pc-oriented 0.24Pb(In1/2Nb1/2)O3 (PIN)-0.46Pb(Mg1/3Nb2/3)O3 (PMN)-0.30PbTiO3 (PT) (PIMN-0.30PT) single crystals (SCs), which were manufactured by continuous-feeding Bridgman (CF BM) within morphotropic phase boundary (MPB) region. By ACP with 4 kVrms/cm from 100 to 70 °C, the PIMN-0.30PT SC attained high dielectric permittivity (ε33T/ε0) of 8330, piezoelectric coefficient (d33) of 2750 pC/N, bar mode electromechanical coupling factor k33 of 0.96 with higher phase change temperature (Tpc) of 103 °C, and high Curie temperature (TC) of 180 °C. These values are the highest ever reported as PIMN-xPT SC system with Tpc > 100 °C. The enhancement of these properties is attributed to the induced low symmetry multi-phase supported by phase analysis. This work indicates that FC ACP is a smart and promising method to enhance piezoelectric properties of relaxor-PT ferroelectric SCs including PIMN-xPT, and provides a route to a wide range of piezoelectric device applications.

Ultrahigh Piezoelectricity After Field Cooling AC Poling in Ferroelectric Crystals Manufactured by Continuous-feeding Bridgman

2021 ◽  
Author(s):  
Cong Luo ◽  
Tomoaki Karaki ◽  
Zhuangkai Wang ◽  
Yiqin Sun ◽  
Yohachi Yamashita ◽  
...  
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Wide Range ◽  
Device Applications ◽  
Change Temperature ◽  
Continuous Feeding ◽  
Multi Phase ◽  
Field Cooling

Abstract We investigated the dielectric and piezoelectric properties of [001]-oriented 0.24Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 (PIMN-0.30PT) single crystals (SCs) manufactured by continuous-feeding Bridgman (CF BM) within morphotropic phase boundary (MPB) region after field cooling alternating current poling (FC ACP). By optimized the FC ACP conditions of 4 kVrms/cm from 100 to 70 oC, the PIMN-0.30PT SC process attained ultrahigh dielectric permittivity (εT 33/ε0) of 8330 and piezoelectric coefficient (d33) of 2750 pC/N, and bar mode electromechanical coupling factor k33 of 0.96 with higher phase change temperature (Tpc) of 103 oC, respectively. These values are the highest ever reported as PIMN-xPT system SCs with Tpc > 100 oC. The enhancement of these properties of the PIMN-0.30PT SC is attributed to the induced low symmetry multi-phase supported by phase analysis. This work indicates that FC ACP is a smart and promising method to enhance piezoelectric properties of relaxor-PT ferroelectric SCs including PIMNT, which provide a route to a wide range of piezoelectric device applications.

Sol-Gel Derived Li2O Doped BNT-BKT-BT Ceramics: Microstructure and Piezoelectric Properties

2012 ◽  
Vol 512-515 ◽  
pp. 1355-1358 ◽  
Author(s):  
Tao Sun ◽  
Ye Jing Dai ◽  
Hong Qiang Wang
Keyword(s):  
High Performance ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Lithium Ion ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Planar Electromechanical Coupling Factor ◽  
Precursor Powders

The introduction of lithium ion into BNT-BKT-BT ceramics with sol-gel method allows the development of high-performance lead-free piezoelectric ceramics. Nanoscale precursor powders were synthesized through calcination of amorphous gels, and densified ceramics with single perovskite structure were prepared at a relatively low sintering temperature 1110 °C. Crystal grain growth was fully developed with the Li+ addition through scanning electron microscope observation. Enhanced electrical properties, piezoelectric constant d33~184 pC/N and planar electromechanical coupling factor kp~0.30, were obtained for the ceramics.

Effect of Sintering Temperature on the Structure and Piezoelectric Properties of Lead-Free 0.97K0.5Na0.5NbO3-0.03AlFeO3 Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 822-825
Author(s):  
Ling Peng ◽  
Min Hong Jiang ◽  
Zheng Fei Gu ◽  
Gang Cheng
Keyword(s):  
Low Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Promising Candidate ◽  
Ceramic Process ◽  
Structure Density

Lead-free piezoelectric 0.97 K0.5Na0.5NbO3-0.03 AlFeO3(KNN-AF) ceramics were prepared at low temperature of 980 °C to 1020 °C by the conventional ceramic process. The effect of sintering temperature on the crystal structure, density and electrical properties of the ceramics was investigated. The results indicate that KNN-AF ceramics sintered at an low temperature of 1000 °C exhibit high electrical and piezoelectric properties, with piezoelectric constantd33=116ρC/N, and electromechanical coupling factorkp= 32.9%, polarization (Pr) wasPr=21.8 μC/cm2and curie temperatureTC=382°C. This also indicates that KNN-AF ceramics are promising candidate materials for lead-free piezoelectric applications.

Dielectric and Piezoelectric Properties of (Na,Ba)(Nb,Ti)O3 Lead-Free Piezoelectric Ceramics

2010 ◽  
Vol 445 ◽  
pp. 55-58 ◽  
Author(s):  
Rintaro Aoyagi ◽  
Makoto Iwata ◽  
Masaki Maeda
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Dielectric And Piezoelectric Properties

(Na1-xBax)(Nb1-xTix)O3 (NNBTx; x=0.0-0.21) solid-solution ceramics were synthesized and their crystal structure, dielectric properties and piezoelectric properties were investigated. The crystal structure at room temperature of NNBTx varied from orthorhombic to tetragonal with increasing BaTiO3 content x. The phase boundary between orthorhombic and tetragonal at room temperature was confirmed BT content between x=0.08 and 0.09. For x>0.05, it was found that the Curie temperature was decreased with increasing x. The highest electromechanical coupling factor, kp, and the largest piezoelectric constant, d33, were obtained at x=0.09-0.10.

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