Enhanced Piezoelectric Properties of Lead-Free Piezoelectric Materials by Microstructure Control

2010 ◽  
Vol 402 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Satoshi Wada ◽  
Shigehito Shimizu ◽  
Petr Pulpan ◽  
Nobuhiro Kumada ◽  
Daisuke Tanaka ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Microstructure Control

FLEXOELECTRIC COMPOSITE — A NEW PROSPECT FOR LEAD-FREE PIEZOELECTRICS

2010 ◽  
Vol 03 (01) ◽  
pp. 79-81 ◽  
Author(s):  
BAOJIN CHU ◽  
WENYI ZHU ◽  
NAN LI ◽  
L. ERIC CROSS
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Physical Phenomenon ◽  
Mechanical Strain ◽  
Dielectric Materials ◽  
Electric Polarization ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Bst Ceramics ◽  
Better Than

Flexoelectricity describes the physical phenomenon of the generation of electric polarization from mechanical strain gradient in solid insulators. In common dielectric materials, the flexoelectric coefficient is trivially small ~10-10 C/m. In Ba(Sr,Ti)O 3 (BST) ceramics, flexoelectric coefficient up to 10-4 C/m was observed. Such high coefficient makes it possible to design high piezoelectric response flexoelectric composites. In this letter, we will demonstrate that the newly designed flexoelectric composites could have piezoelectric properties better than conventional piezoelectric materials.

Lead Free (Bi, Na)TiO3–BiAlO3 Ceramics for Piezoelectric Application

2020 ◽  
Vol 15 (4) ◽  
pp. 459-462
Author(s):  
Jae-Hoon Ji ◽  
Don-Jin Shin ◽  
Sang-Kwon Lee ◽  
Sang-Mo Koo ◽  
Jae-Geun Ha ◽  
...  
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Electromechanical Coupling Coefficient ◽  
Substitution Effects ◽  
Sensors And Actuators ◽  
Device Applications ◽  
Piezoelectric Devices ◽  
Piezoelectric Charge

In this research, substitution effects of BiAlO3 with (Bi, Na)TiO3 piezoelectric ceramics was investigated for the sensors and actuators applications. (Bi,Na)TiO3 material has been employed for the piezoelectric devices applications because of their high piezoelectric charge constant, d33, of 88 pC/N, electromechanical coupling coefficient, kp, of 22% and inverse piezoelectric charge constant of 498 pm/V. As a piezoelectric material, (Bi, Na)TiO3 has perovskite structure with tetragonal basis. The improvement of piezoelectric and inverse piezoelectric properties is important for industrial device applications. Therefore, in this research, we have tried to increase functional and electrical properties of (Bi, Na)TiO3 piezoelectric materials by substituting BiAlO3 dopants. As a result, the piezoelectric constant was increased up to 140 pC/N, and the densification was increased up to 5.92 g/cm3 .

Piezoelectric Properties and Dielectric Property of Li Added KNN Ceramics

2013 ◽  
Vol 566 ◽  
pp. 72-75 ◽  
Author(s):  
Akihiro Mitani ◽  
Yoshinari Oba
Keyword(s):  
Dielectric Property ◽  
Curie Temperature ◽  
Perovskite Structure ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Environmental Issues ◽  
Lead Free ◽  
High Curie Temperature ◽  
A Site

Recently, high performance lead-free piezoelectric materials are strongly demanded for environmental issues. (K0.5Na0.5)NbO3 (KNN) has been attracting interest as lead-free piezoelectric ceramics because of its high Curie temperature and excellent piezoelectric properties. In this study, we investigated effects of Li addition on piezoelectric properties of (Li,Na,K)(Nb+Ta)O3+CuO,BaTiO3 . We found that optimum Li ratio of A site and B site on the perovskite structure increases relative density and .

Effect of Bi2O3 Addition on the Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3-Ba(Sn0.02Ti0.98)O3 Ceramics

2013 ◽  
Vol 284-287 ◽  
pp. 3-7
Author(s):  
Chun Huy Wang
Keyword(s):  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Dominant Role ◽  
Lead Free ◽  
Coupling Coefficients ◽  
Sintering Process ◽  
Environment Problem ◽  
Lead Free Ceramics

PbZrO3-PbTiO3 (PZT)-based ceramics are playing a dominant role in piezoelectric materials, their evaporation of harmful lead oxide during the sintering process causes a crucial environment problem. It is necessary to search for lead-free piezoelectric materials that have such excellent properties as those found in the PZT-based ceramics. Therefore (Na0.5K0.5)NbO3-based solid solutions were studied to improve piezoelectric properties. In the present study, various quantities of Bi2O3 were added into 0.98(Na0.5K0.5)NbO3-0.02Ba(Sn0.02Ti0.98)O3 (0.98NKN-0.02BST) ceramics. It was found that 0.98NKN-0.02BST with the addition of 0~4.0 wt.% Bi2O3 exhibit relatively good piezoelectric properties. For 0.98NKN-0.02BST ceramic with the addition of 1.0 wt.% Bi2O3, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.21 and 0.46, respectively, at the sintering of 1100oC for 3 h. The ratio of thickness coupling coefficient to planar coupling coefficient is 2.2. It is obvious that 0.98NKN-0.02BST solid solution ceramic by adding low quantities of Bi2O3 is one of the promising lead-free ceramics for high frequency electromechanical transducer applications.

scholarly journals Preparation and Characterization of Lead-Free Piezoelectric Ceramics

2011 ◽  
Vol 492 ◽  
pp. 189-193
Author(s):  
Qiang Chen ◽  
Jin Xu Li ◽  
Li Hui Zhang ◽  
Yang Bai ◽  
Yan Jing Su ◽  
...  
Keyword(s):  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Piezoelectric Materials ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Practical Applications ◽  
Structure Density ◽  
Traditional Ceramics

(K,Na)NbO3-based piezoelectric ceramics are promising candidates for practical applications of lead-free piezoelectric materials due to their excellent piezoelectric properties. In this paper, lead-free piezoelectric ceramics (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3(KNL-NTS)were successfully fabricated by traditional ceramics processing. The effects of sintering temperature on the structure, density and electrical properties of KNL-NTS ceramics were investigated. Crystal phases of both calcined powders and KNL-NTS ceramics have orthorhombic structure similar to that of KNbO3 ceramics. The piezoelectric coefficient first increases and then decreases with sintering temperature in the 1100-1180 °C range. KNL-NTS ceramics sintered at 1160 °C shows the maximum piezoelectric coefficient of about 199 pC·N-1and the maximum remnant polarization of 18.75 μC·cm-2, with the corresponding 10.95 kV·cm-1coercive field and 4.74 g/cm3density.

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 Current Development in Lead-FreeBi0.5(Na,K)0.5TiO3-Based Piezoelectric Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Ngo Duc Quan ◽  
Luong Huu Bac ◽  
Duong Van Thiet ◽  
Vu Ngoc Hung ◽  
Dang Duc Dung
Keyword(s):  
Solid Solution ◽  
Piezoelectric Properties ◽  
Domain Switching ◽  
Piezoelectric Materials ◽  
Secondary Phase ◽  
Lead Free ◽  
Secondary Phases ◽  
Current Development ◽  
Cubic Phases

The lead-free piezoelectric ceramics display good piezoelectric properties which are comparable with Pb(Zr,Ti)O3(PZT) and these materials overcome the hazard to the environment and human health. The Bi0.5(Na,K)0.5TiO3(BNKT) is rapidly developed because of good piezoelectric, ferroelectric, and dielectric properties compared to PZT. The origin of giant strain of BNKT piezoelectric materials was found at morphotropic phase boundary due to crystal change from tetragonal to orthorhombic and/or precipitation of cubic phases, in addition to domain switching mechanism. The dopants or secondary phases withABO3structure as solid solution are expected to change the crystal structure and create the vacancies which results in enhancement of the piezoelectric properties. In this work, we reviewed the current development of BNKT by dopants and secondary phase as solid solution. Our discussion will focus on role of dopants and secondary phase to piezoelectric properties of BNKT. This result will open the direction to control the properties of lead-free piezoelectric materials.

scholarly journals WHAT CAN BE EXPECTED FROM LEAD-FREE PIEZOELECTRIC MATERIALS?

2010 ◽  
Vol 03 (01) ◽  
pp. 5-13 ◽  
Author(s):  
DRAGAN DAMJANOVIC ◽  
NAAMA KLEIN ◽  
JIN LI ◽  
VIKTOR POROKHONSKYY
Keyword(s):  
Domain Wall ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Wall Motion ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Domain Wall Motion ◽  
Lead Free

The reasons for the lower piezoelectric properties in the most studied lead-free piezoelectrics, modified (K, Na)NbO 3 and ( Bi 0.5 Na 0.5) TiO 3, are discussed. Contributions from domain wall motion and properties at the morphotropic phase boundary are considered and are compared to those in PZT. Lead-free, non-piezoelectric solutions to electromechanical coupling are discussed.

scholarly journals Processing and characterization of lead-free ceramics on the base of sodium–potassium niobate

2018 ◽  
Vol 08 (01) ◽  
pp. 1850004 ◽  
Author(s):  
E. D. Politova ◽  
N. V. Golubko ◽  
G. M. Kaleva ◽  
A. V. Mosunov ◽  
N. V. Sadovskaya ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Potassium Niobate ◽  
Sodium Potassium ◽  
Sodium Potassium Niobate ◽  
Lead Free Ceramics ◽  
Donor And Acceptor ◽  
Perovskite Lattice

Lead-free sodium–potassium niobate-based piezoelectric materials are most intensively studied in order to replace the widely used Pb-based ones. In this work, the effects of modification of compositions by donor and acceptor dopants in the A- and B-sites of perovskite lattice on structure, dielectric, ferroelectric, and piezoelectric properties of ceramics from Morphotropic Phase Boundary in the ([Formula: see text])(K[Formula: see text]Na[Formula: see text])NbO3–[Formula: see text]BaTiO3 system and in compositions with [Formula: see text] and 0.06 additionally doped by Ni[Formula: see text] cations have been studied.

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