High Dielectric Constant and Large Electromechanical Coupling Factor Relaxor-Based Piezoelectric Ceramics

(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.

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Influence of Poling Conditions on the Characteristics of PZT Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.1375 ◽

2011 ◽

Vol 284-286 ◽

pp. 1375-1380 ◽

Cited By ~ 2

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.887-888.289 ◽

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.

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

Journal of Advanced Ceramics ◽

10.1007/s40145-021-0490-1 ◽

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.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1455 ◽

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.

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Dielectric and Piezoelectric Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.85K0.15)0.5TiO3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.211-212.152 ◽

2011 ◽

Vol 211-212 ◽

pp. 152-155

Author(s):

Chun Huy Wang

Keyword(s):

Solid Solution ◽

Dielectric Constant ◽

Coupling Coefficient ◽

Electromechanical Coupling ◽

Piezoelectric Properties ◽

Electromechanical Coupling Factor ◽

Coupling Factor ◽

Lead Free ◽

Solid Solution System ◽

Dielectric And Piezoelectric Properties

Extending the investigations on (Na0.5K0.5)NbO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na0.5K0.5)NbO3–Bi0.5(Na0.85K0.15)0.5TiO3[NKN-BNKT]. (Na0.5K0.5)NbO3with 2 ~ 6 mol% Bi0.5(Na0.85K0.15)0.5TiO3has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and hexagonal (H) was found at the composition 0.96NKN-0.04BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (KT33), planar coupling coefficient (kp) and thickness coupling coefficient (kt)of 0.96NKN-0.04BNKT ceramics were 1273, 34% and 38%, respectively.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.760-762.763 ◽

2013 ◽

Vol 760-762 ◽

pp. 763-766 ◽

Cited By ~ 1

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.

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Electrical and Physical Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.93K0.07)0.5TiO3 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1351 ◽

2012 ◽

Vol 512-515 ◽

pp. 1351-1354

Author(s):

Chun Huy Wang

Keyword(s):

Solid Solution ◽

Dielectric Constant ◽

Coupling Coefficient ◽

Electromechanical Coupling ◽

Electromechanical Coupling Factor ◽

Coupling Factor ◽

Lead Free ◽

Solution System ◽

Solid Solution System ◽

Dielectric And Piezoelectric Properties

Extending the investigations on (Na0.5K0.5)NbO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na0.5K0.5)NbO3–Bi0.5(Na0.93K0.07)0.5TiO3 [NKN-BNKT]. (Na0.5K0.5)NbO3 with 2 ~ 6 mol% Bi0.5(Na0.93K0.07)0.5TiO3 has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and rhombohedral (R) was found at the composition 0.98NKN-0.02BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (KT33), planar coupling coefficient (kp) and thickness coupling coefficient (kt)of 0.98NKN-0.02BNKT ceramics were 1040, 47% and 48%, respectively.

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