Physical and Electrical Properties of Lead-Free (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 Ceramics

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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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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Piezoelectric and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.80K0.20)0.5TiO3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.230-232.12 ◽

2011 ◽

Vol 230-232 ◽

pp. 12-15

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(Na0.80K0.20)0.5TiO3[NKN-BNKT]. (Na0.5K0.5)NbO3with 2 ~ 6 mol% Bi0.5(Na0.80K0.20)0.5TiO3has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and tetragonal (T) was found at the composition 0.97NKN-0.03BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (εr), planar coupling coefficient (kp) and thickness coupling coefficient (kt)of 0.97NKN-0.03BNKT ceramics were 1483, 32% and 31%, respectively.

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Electrical and Physical Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.90K0.10)0.5TiO3 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.791 ◽

2014 ◽

Vol 602-603 ◽

pp. 791-794

Author(s):

Chun Huy Wang

Keyword(s):

Solid Solution ◽

Dielectric Constant ◽

Coupling Coefficient ◽

Electromechanical Coupling ◽

Rhombohedral Phase ◽

Electromechanical Coupling Factor ◽

Coupling Factor ◽

Lead Free ◽

Structure Changes ◽

Solid Solution System

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)NbO3Bi0.5(Na0.90K0.10)0.5TiO3 [NKN-BNK. (Na0.5K0.5)NbO3 with 1 ~ 5 mol% Bi0.5(Na0.90K0.10)0.5TiO3 has been prepared following the conventional mixed oxide process. It can be concluded that the NKN-BNKT ceramics have orthorhombic structures in the case x 0.03. With increasing BNKT content (x=0.04 to 0.05), however, the structure changes from orthorhombic to rhombohedral phase. Above results demonstrated that the MPB between orthorhombic and rhombohedral phases exits in the solid solution with the BNKT content of x=0.03. At the MPB composition, the cryctalline structure of ceramics is considered to be a coexistence of orthorhombic and rhombohedral phase. Owing to the phase coexistence at the phase boundary, there exists a different symmetry regions (DSR) near the MPB. The DSR boundary motion increases the dielectric permittivity and piezoelectric coefficients. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (KT33), planar coupling coefficient (kp), thickness coupling coefficient (kt) and piezoelectric constant (d33)of 0.98NKN-0.02BNKT ceramics were 1180, 30%, 58%, and 180, respectively.

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SYNTHESIS AND PIEZOELECTRIC PROPERTIES OF (Ba1-xCax)(Ti1-yZry)O3 BY A NOVEL COMPOSITE-HYDROXIDE-MEDIATED APPROACH

Functional Materials Letters ◽

10.1142/s1793604712600132 ◽

2012 ◽

Vol 05 (02) ◽

pp. 1260013

Author(s):

TAKESHI KIMURA ◽

SHU YIN ◽

TAKATOSHI HASHIMOTO ◽

ATUSHI SASAKI ◽

YUICHI TOKANO ◽

...

Keyword(s):

High Purity ◽

Electromechanical Coupling ◽

Piezoelectric Properties ◽

Electromechanical Coupling Factor ◽

Coupling Factor ◽

Mechanical Quality Factor ◽

Narrow Size Distribution ◽

Mechanical Quality ◽

Average Size ◽

Quality Factor Q

High purity ( Ba 1-x Ca x)( Ti 1-y Zr y) O 3((x,y)=(0.00,0.00)–(0.50,0.50)) were synthesized by a composite-hydroxide-mediated approach at 200°C using a sealed tube with a rolling system. The powders with an average size of 50 nm in diameter and narrow size distribution were produced. The highest electromechanical coupling factor k r was 36.1% ((x,y) = (0.05,0.03)) and highest mechanical quality factor Q m was 256 ((x,y) = (0.11,0.13)).

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Study on Properties of NiO-Doping PMSZT Piezoelectric Ceramics Sintered at Low Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.770 ◽

2012 ◽

Vol 487 ◽

pp. 770-774

Author(s):

Wei Ye Chen ◽

Lan Zhu ◽

Peng Yi Liu ◽

Cai Ping Lin ◽

Hao Jian Tu

Keyword(s):

Electromechanical Coupling ◽

Piezoelectric Properties ◽

Rhombohedral Phase ◽

Electromechanical Coupling Factor ◽

Coupling Factor ◽

Mechanical Quality Factor ◽

Doping Amount ◽

Pure Perovskite Structure ◽

Mechanical Quality ◽

Quality Factor Q

The effects of NiO-doping on the microstructure and piezoelectric properties of PMSZT ceramics were investigated. The experimental results indicate that pure perovskite structure was obtained in the doping range. With the increasing of doping amounts, phases shift from tetragonal phase to rhombohedral phase. The mechanical quality factor (Qm) , Dielectric constant (εr) , electromechanical coupling factor (Kp) and piezoelectric constant (d33) increase with the increasing of doping amounts and then decrease, whereas, dielectric loss (tanδ) decrease and then increase. The ceramics with doping amount of 0.1wt.% sintered at 980 °C have the optim properties of Qm=1345, εr=1853, Kp=0.62, d33=375 and tanδ=0.21%。

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Preparation of Barium Titanate–Potassium Niobate Solid Solution System Ceramics and Their Piezoelectric Properties

Japanese Journal of Applied Physics ◽

10.1143/jjap.47.7678 ◽

2008 ◽

Vol 47 (9) ◽

pp. 7678-7684 ◽

Cited By ~ 31

Author(s):

Satoshi Wada ◽

Momoyo Nitta ◽

Nobuhiro Kumada ◽

Daisuke Tanaka ◽

Masahito Furukawa ◽

...

Keyword(s):

Solid Solution ◽

Barium Titanate ◽

Piezoelectric Properties ◽

Potassium Niobate ◽

Solution System ◽

Solid Solution System

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Piezoelectric Properties of PZT-5 Fiber/Epoxy Resin 1-3 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.486 ◽

2011 ◽

Vol 239-242 ◽

pp. 486-489

Author(s):

Ling Fang Xu ◽

Wen Chen ◽

Jing Zhou ◽

Chang Ping Yang

Keyword(s):

Epoxy Resin ◽

Coupling Coefficient ◽

Piezoelectric Properties ◽

Volume Fraction ◽

Mechanical Quality Factor ◽

Casting Method ◽

Anisotropic Property ◽

Niobium Doped ◽

Mechanical Quality ◽

Method Effects

Niobium doped Pb(Zr,Ti)O3fiber/epoxy resin 1-3 composites with different ceramic volume fraction of 10-85% were fabricated by filling-casting method. Effects of ceramic volume fraction on electric properties were investigated. For a typical 30% ceramic content composite, the thickness coupling coefficientkt, mechanical quality factorQm, acoustic impedanceZmand anisotropic propertykt/kpwere 0.67, 0.55, 11.03 MRayl and 2.23, respectively.

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