Contribution to the measurement of the electromechanical coupling factor k33of piezoelectric ceramics

1999 ◽  
Vol 224 (1) ◽  
pp. 39-46 ◽  
Author(s):  
P. Hana ◽  
L. Burianova ◽  
D. Barosova ◽  
J. Zelenka
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor

(1-x)(K0.475Na0.475Li0.05)(Nb0.975Sb0.025)O3-xBiFeO3 Lead-Free Piezoelectric Ceramics with CuO Sintering Aid

2011 ◽  
Vol 687 ◽  
pp. 228-232
Author(s):  
Yong Jie Zhao ◽  
Yu Zhen Zhao ◽  
Rong Xia Huang ◽  
Rong Zheng Liu ◽  
He Ping Zhou
Keyword(s):  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Piezoelectric Materials ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Mechanical Quality Factor ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Diffraction Patterns

(1-x) (K0.475Na0.475Li0.05)(Nb0.975Sb0.025)O3-xmolBiFeO3 (x=0, 0.002, 0.004, 0.006, 0.008) doped with 0.8mol%CuO lead-free piezoelectric ceramics were prepared by the solid state reaction technique. X-ray diffraction patterns suggested that all the ceramics presented perovskite structure. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. The ceramic (x=0.002) near room temperature exhibited excellent electrical properties (piezoelectric constant d33=172pC/N, planar electromechanical coupling factor kp=0.43, and dielectric constant =418). A relatively high mechanical quality factor (Qm=200) was also obtained in this particular composition. All these results revealed that this system might become a promising candidate for lead-free piezoelectric materials.

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.

A Study on the Materials Properties of Piezoelectric Ceramics Used in Jetting Apparatus

2006 ◽  
Vol 326-328 ◽  
pp. 1455-1458
Author(s):  
Juh Wan Yang ◽  
Chang Sung Park ◽  
Won Chul Sim ◽  
Young Jae Kim ◽  
Soon Young Kim ◽  
...  
Keyword(s):  
Electromechanical Coupling ◽  
Laser Doppler Vibrometer ◽  
Resonance Method ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Point Of View ◽  
Piezoelectric Strain ◽  
Piezoelectric Strain Constant ◽  
Piezoelectric Constants

In this study, specially used in fluidic jetting apparatus, the electrical properties of piezoelectric ceramics were investigated by the resonance method and from its vibratory motion point of view. The piezoelectric ceramics were a rectangular bar type bulk and estimated by their piezoelectric constants, for example, electromechanical coupling factor, piezoelectric strain constant and so on. The measured values were compared with the displacement by the Laser Doppler Vibrometer analysis and with the droplet properties.

Influence of Calcined Temperature on the Piezoelectric Properties of (Na0.48K0.47Li0.05)NbO3 Lead-Free Piezoelectric Ceramics Doped with CuO

2013 ◽  
Vol 760-762 ◽  
pp. 763-766 ◽  
Author(s):  
Xin You Huang ◽  
Mu Sheng Huang ◽  
Chun Hua Gao
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Solid State Reaction Method ◽  
Coupling Factor ◽  
Lead Free ◽  
Comprehensive Properties ◽  
Piezoelectric Strain ◽  
Calcined Temperature ◽  
Sintered Temperature

Na0.48K0.47Li0.05)NbO3(NKLN)Lead-free piezoelectric ceramics doped with CuO were prepared by traditional solid-state reaction method. Influence of calcined temperature on the material phase of NKLN lead-free piezoelectric ceramics doped with CuO by X-ray diffraction (XRD) and the influence of calcined temperature and sintered temperature on the properties of NKLN lead-free piezoelectric ceramics doped with CuO by others analysis method. The results show that the best calcined temperature is got, when calcined temperature is up to 850 °C, the mixed phase disappeares, a single phase perovskites structure is formed. With the increase of calcined temperature, piezoelectric strain constant (d33) planar electromechanical coupling factor (Kp) of NKLN lead-free piezoelectric ceramics increase first and then decrease, while only dielectric loss (tanδ) decreases first and then increases.The best calcined temperature is 850 °C, the best sintered temperature is 1080 °C, the NKLN lead-free piezoelectric ceramics doped with CuO with good comprehensive properties are obtained, whose d33, Kp, tanδ are 85 pC/N, 0.3, 0.038, respectively.

Piezoelectric and Dielectric Properties of Bi2O3-Doped (Bi0.5Na0.5)0.94Ba0.06TiO3 Lead-Free Piezoelectric Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 1915-1918 ◽  
Author(s):  
Jian Qiang Hu ◽  
Zhi Wu Chen
Keyword(s):  
Dielectric Properties ◽  
Electromechanical Coupling ◽  
Relative Dielectric Constant ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Tetragonal Symmetry ◽  
X Ray Diffraction ◽  
Conventional Sintering

Bi2O3 doped (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT6) lead-free piezoelectric ceramics were fabricated by a conventional sintering technique. The effects of Bi2O3 on the piezoelectric properties and microstructures of the doped BNBT6 were investigated. X-ray diffraction analysis showed that a solid solution was formed when Bi2O3 diffused into BNBT6 lattice and the crystal structure of the sintered hybrid changed from rhombohedral to tetragonal symmetry with increasing Bi2O3 amount. Piezoelectric and dielectric properties measurements revealed that doping Bi2O3 within a certain range enhanced the piezoelectric coefficient (d33), electromechanical coupling factor (kp), relative dielectric constant (ε33 T/ε0), and dielectric loss (tanδ). When 3mol% Bi2O3 was doped, both d33 and kp of the ceramics reached their maxima, 165pC/N and 24%, respectively.

Piezoelectric and Dielectric Properties of (Bi0.5Na0.5)0.94(Ba1-xSrx)0.06TiO3 Lead-Free Piezoelectric Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 1911-1914 ◽  
Author(s):  
Zhi Wu Chen ◽  
Zhen Ya Lu ◽  
Jian Qiang Hu
Keyword(s):  
Crystal Structure ◽  
Electromechanical Coupling ◽  
Relative Dielectric Constant ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Xrd Analysis ◽  
Coupling Factor ◽  
Lead Free ◽  
Tetragonal Symmetry ◽  
Pure Perovskite Structure

Lead-free piezoelectric ceramics (Bi0.5Na0.5)0.94(Ba1-xSrx)0.06TiO3 (abbreviated as BNBST-100x, with x ranges from 0.02 to 0.1) have been investigated. Effects of amount of Sr-substitution on the electrical properties and crystal structure of the ceramics were studied. The BNBST-100x ceramics sintered at 1200°C for 2h in air have high density around 5.69~5.75g/cm3. X-ray diffraction (XRD) analysis shows that all of the BNBST-100x ceramics have pure perovskite structure. At high amount level of Sr-substitution, the crystal structure of the samples changes from rhombohedral to tetragonal symmetry. Piezoelectric and dielectric measurements reveal that Sr-substitution amount within a certain range will lead to the increase of piezoelectric coefficient (d33), electromechanical coupling factor (kp), and relative dielectric constant (ε33 T/ε0). At 6 mol% Sr-substitution level, the d33 and kp of the ceramics reach maximum, with values of 168 pC/N and 34%, respectively.

Effects of Co2O3 on the Piezoelectric Properties of Na0.5Bi0.5TiO3 Lead-Free Piezoelectric Ceramics

2010 ◽  
Vol 434-435 ◽  
pp. 340-342
Author(s):  
Xiang Ping Jiang ◽  
Zi Yi Feng ◽  
Mei Lin ◽  
Chao Chen ◽  
Kai Zheng Shu
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Ceramics ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Mechanical Quality Factor ◽  
Electric Properties ◽  
Lead Free ◽  
Dense Microstructure ◽  
State Process ◽  
Process Effects

Lead-free piezoelectric ceramics Na0.5Bi0.5TiO3+xmol%Co3+ (NBT-xC) were synthesized by conventional solid-state process. Effects of Co3+ addition on the phase structure, dielectric and piezo- electric properties of NBT-xC were investigated. The X-ray diffraction suggested that all specimens were rhombohedral perovskite structure. After a small addition of Co2O3, a dense microstructure with increased grains was developed. The doping with Co3+ enhanced mechanical quality factor Qm significantly, whereas piezoelectric constant d33 and electromechanical coupling factor kp decreased slightly with increasing amount of Co3+. For the ceramics with x=3, the electric properties become optimum, which are as follows: d33=~70pC/N, kp=~13%, Qm=~934, tanδ=~0.02 (1kHz), respectively. These results indicate that the Co3+ ion was considered to replace Ti4+ ion and present “hard doping” effect.

scholarly journals Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6438
Author(s):  
Guangtao Lu ◽  
Xin Zhu ◽  
Tao Wang ◽  
Zhiqiang Hao ◽  
Bohai Tan
Keyword(s):  
Resonance Frequency ◽  
Electromechanical Coupling ◽  
Structural Parameters ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Stress Waves ◽  
Parallel Connection ◽  
Smart Aggregate ◽  
In Series ◽  
Piezoelectric Wafers

A novel piezoceramic stack-based smart aggregate (PiSSA) with piezoceramic wafers in series or parallel connection is developed to increase the efficiency and output performance over the conventional smart aggregate with only one piezoelectric patch. Due to the improvement, PiSSA is suitable for situations where the stress waves easily attenuate. In PiSSA, the piezoelectric wafers are electrically connected in series or parallel, and three types of piezoelectric wafers with different electrode patterns are designed for easy connection. Based on the theory of piezo-elasticity, a simplified one-dimensional model is derived to study the electromechanical, transmitting and sensing performance of PiSSAs with the wafers in series and parallel connection, and the model was verified by experiments. The theoretical results reveal that the first resonance frequency of PiSSAs in series and parallel decreases as the number or thickness of the PZT wafers increases, and the first electromechanical coupling factor increases firstly and then decrease gradually as the number or thickness increases. The results also show that both the first resonance frequency and the first electromechanical coupling factor of PiSSA in series and parallel change no more than 0.87% as the Young’s modulus of the epoxy increases from 0.5 to 1.5 times 3.2 GPa, which is helpful for the fabrication of PiSSAs. In addition, the displacement output of PiSSAs in parallel is about 2.18–22.49 times that in series at 1–50 kHz, while the voltage output of PiSSAs in parallel is much less than that in parallel, which indicates that PiSSA in parallel is much more suitable for working as an actuator to excite stress waves and PiSSA in series is suitable for working as a sensor to detect the waves. All the results demonstrate that the connecting type, number and thickness of the PZT wafers should be carefully selected to increase the efficiency and output of PiSSA actuators and sensors. This study contributes to providing a method to investigate the characteristics and optimize the structural parameters of the proposed PiSSAs.

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