Microstructure and Characteristics of PbTiO3-PbZrO3-Pb(Mg1/3Nb2/3)O3- Pb(Zn1/3Nb2/3)O3 Ceramics

Coupling Factor ◽

Optimal Choice ◽

Mechanical Quality ◽

Piezoelectric Measurement ◽

The new piezoelectric ceramic of PbTiO3-PbZrO3-Pb(Mg1/3Nb2/3)O3 -Pb(Zn1/3Nb2/3)O3 with composition close to the morphotropic phase boundary was studied. The dielectric and piezoelectric properties of Pb0.96Sr0.04[(Zr1-yTiy)0.74(Mg1/3Nb2/3)0.20(Zn1/3Nb2/3)0.06]O3 were investigated, the composition range examined are 0.47 £ y £ 0.57. From the results of XRD and piezoelectric measurement, it is supposed that the composition with y = 0.51 corresponds to M.P.B. between tetragonal and pseudocubic perovskite. Some developed phenomena or models are introduced and take it to interpret well. After optimal choice of these conditions, the planar coupling factor close to 0.65, mechanical quality factor Qm close to 75, the longitude wave velocity close to 4100 m/s and the poled dielectric constant close to 2600 can be approached in this study.

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

10.4028/www.scientific.net/amr.239-242.3240 ◽

2011 ◽

Vol 239-242 ◽

pp. 3240-3243 ◽

Cited By ~ 4

Author(s):

Chun Huy Wang

Keyword(s):

Solid Solution ◽

Coupling Coefficient ◽

Coupling Factor ◽

Lead Free ◽

Solution System ◽

Solid Solution System ◽

Mechanical Quality ◽

Quality Factor Q

Extending the investigations on (Bi0.5Na0.5)TiO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3[BNT-BKT]. (Bi0.5Na0.5)TiO3with 7~ 30 mol% (Bi0.5K0.5)TiO3ceramics have been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between rhombohedral (R) and tetragonal (T) was found at the composition 0.82BNT-0.18BKT with correspondingly enhanced piezoelectric properties. The electromechanical planar coupling factor is higher for compositions near the MPB. The mechanical quality factor (Qm), planar coupling coefficient (kp) and thickness coupling coefficient (kt) of 0.82BNT-0.18BKT ceramics were 125, 28.8% and 47.4%, respectively.

Dielectric and Piezoelectric Properties of Gd-modified (1-x) BiFeO3-xPbTiO3 Ceramics with a Morphotropic Phase Boundary

MRS Proceedings ◽

10.1557/opl.2013.513 ◽

2013 ◽

Vol 1507 ◽

Author(s):

Dalei Wang ◽

Shundong Bu ◽

Guoxi Jin ◽

RuiDai ◽

Dengren Jin ◽

...

Keyword(s):

Dielectric Constant ◽

Phase Boundary ◽

Morphotropic Phase Boundary ◽

Composition Range ◽

X Ray Diffraction ◽

Wide Composition Range ◽

X Ray ◽

Dielectric Constant And Loss ◽

ABSTRACT(1-x)(Bi0.8Gd0.2)FeO3-xPbTiO3 (BGF-PT) solid solutions ceramics of x=0.55,0.50,0.4975, 0.49 and 0.45 were prepared by the mixed oxide method. Gd3+ of 20 at% was introduced into the Bi3+ site to improve the dielectric and piezoelectric properties of BFPT without causing the significant reduction of Curie temperature (Tc). X-ray diffraction analysis shows a transformation from the tetragonal (T) to rhombohedral (R) phase with the increase of BGF content. The morphotropic phase boundary was determined by measuring the dielectric and piezoelectric properties of BGF-PT within a wide composition range. BGF-PT for x=0.4975 shows the coexistence of T and R phases with the dielectric constant and loss of about 895 and 0.031 respectively at the frequency of 102 Hz.

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

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 ◽

Coupling Factor ◽

Lead Free ◽

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)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.

Fabrication and Properties of 1-3-2 Piezoelectric Composites

10.4028/www.scientific.net/amr.123-125.77 ◽

2010 ◽

Vol 123-125 ◽

pp. 77-80

Author(s):

Shi Feng Huang ◽

Dong Yu Xu ◽

Jun Chang ◽

Ya Mei Liu ◽

Xin Cheng

Keyword(s):

Piezoelectric Ceramic ◽

Volume Fraction ◽

Functional Materials ◽

Coupling Factor ◽

Planar Electromechanical Coupling Factor

Piezoelectric Composites ◽

Mechanical Quality ◽

In this paper, the 1-3-2 piezoelectric composites were fabricated by the cut-filling technique using P(MN)ZT piezoelectric ceramic as functional materials and polymer as matrix. The effects of ceramic volume fraction on the electrical properties of the composites were studied. The results indicate that as the ceramic volume fraction increases, the piezoelectric stain factor d33 increases evidently, while the piezoelectric voltage factor g33 decreases. Besides, the planar electromechanical coupling factor Kp and mechanical quality factor Qm of the composite are also less than those of the pure ceramic, while the thickness electromechanical coupling factor Kt is larger than that of the ceramic.

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 ◽

Coupling 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)).

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

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):

Rhombohedral Phase ◽

Coupling 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%。

Structure, dielectric and piezoelectric properties of Pb[(Zr0.45,Ti0.5)(Mn0.5,Sb0.5)0.05]O3 ceramics

Processing and Application of Ceramics ◽

10.2298/pac2001019h ◽

2020 ◽

Vol 14 (1) ◽

pp. 19-24

Author(s):

Louanes Hamzioui ◽

Fares Kahoul ◽

Ahmed Boutarfaia ◽

Abderezak Guemache ◽

Michel Aillerie

Keyword(s):

Dielectric Constant ◽

Coupling Factor ◽

X Ray Diffraction ◽

X Ray ◽

Practical Applications ◽

Average Grain Size ◽

Dielectric And Piezoelectric Properties ◽

Scanning Electron ◽

Piezoelectric Constants

This study describes structure, dielectric and piezoelectric properties of Pb[(Zr0.45,Ti0.5)(Mn0.5,Sb0.5)0.05]O3 (PZT-PMS) ceramics prepared by conventional mixed-oxide route and sintered at up to 1180?C. The prepared ceramics was characterized by X-ray diffraction and scanning electron microscopy. The piezoelectric constants, dielectric constant, Young?s modulus and electromechanical factors were measured in broad temperature range. The results showed that the PZT-PMS ceramics is composed of tetragonal and rhombohedral phases and has the average grain size of about 1 ?m. The Pb[(Zr0.45,Ti0.5)(Mn0.5,Sb0.5)0.05]O3 ceramics has excellent dielectric and piezoelectric properties for wide practical applications. Thus, planar coupling factor of 0.70, poled dielectric constant of 8215, the Curie temperature of 345?C and dielectric loss of 6% were attained in the PZT-PMS ceramics sintered at 1180?C.

Microstructure and Piezoelectric Properties of [(K0.5Na0.5)1-xLix](Nb1-yTay)O3 Lead-Free Piezoelectric Ceramics

10.4028/www.scientific.net/amr.156-157.1522 ◽

2010 ◽

Vol 156-157 ◽

pp. 1522-1527

Author(s):

Bei Xu ◽

Feng Gao ◽

Bo Li ◽

Liang Liang Liu ◽

Zhen Qi Deng

Keyword(s):

Room Temperature ◽

Composition Range ◽

Piezoelectric Ceramics ◽

Lead Free ◽

Mechanical Quality ◽

Curie Temperature Tc ◽

Room Temperature Dielectric Constant ◽

Tetragonal Phase Transition

Li+ and Ta5+ modified lead-free piezoelectric ceramics [(K0.5Na0.5)1-xLix](Nb1-yTay)O3 have been prepared by an ordinary sintering technique. Effect of Li+ and Ta5+ on microstructure and piezoelectric properties of the ceramics was systematically studied. A morphotropic phase boundary between orthorhombic and tetragonal phases is identified in the composition range of (0.02≤x≤0.04, 0.15≤y≤0.25), which can enhance electrical properties of [(K0.5Na0.5)1-xLix](Nb1-yTay)O3 ceramics. The Curie temperature TC of these ceramics is lower than that of pure (K0.5Na0.5)NbO3 ceramics, but the temperature of orthorhombic to tetragonal phase transition TO-T of the former is higher than that of the latter. TC and TO-T both decrease as the content of Ta5+ increases. With the addition of Li+ increasing, TC increases. The optimal piezoelectric properties are obtained at (x, y)=(0.03, 0.20): piezoelectric constant d33 is 192pC/N; the electromechanical coefficient of the planar mode kp is 44%; room temperature dielectric constant εr is 1049, and the corresponding mechanical quality factor Qm is 49.

The Effect of Particle Size on the Electromechanical Properties of PZT/PVDF

10.4028/www.scientific.net/amr.66.238 ◽

2009 ◽

Vol 66 ◽

pp. 238-241

Author(s):

Xiao Fang Liu ◽

Hua Jun Sun ◽

Ming Wei ◽

C.X. Xiong

Keyword(s):

Particle Size ◽

Piezoelectric Ceramic ◽

Volume Fraction ◽

Relative Dielectric Constant ◽

Connectivity Pattern ◽

Conventional Solid State Reaction ◽

Pressing Method ◽

The Nb modified PZT piezoelectric ceramic was synthesized by conventional solid-state reaction, where all of different particle sizes had the same physical properties. 0-3 modified PZT/PVDF composites were formed by hot-pressing method. The particle size effect of modified PZT on the relative dielectric and piezoelectric properties of the composites were investigated. The relative dielectric constant εr, piezoelectric constant d33 and electromechanical coupling factor kp were higher in the composite containing larger PZT particle size. The microstructures of the composites were studied by SEM, the composite with the finer PZT particle size was more homogeneous, but larger particle size was easy to be contacted. In a high volume fraction particle-loaded composite, some piezoelectric ceramic particle appeared to be in contact, as in a 1-3 connectivity pattern. The larger particle size of modified PZT itself could be seen as the grain of modified PZT contact in a 1-3 connectivity pattern and easy to be contacted each other compared to the finer particle size in the composites, thus reducing the resistance of the composites and the poling process became effective, which led to higher properties. The optimal particle size of PZT is about 100μm, the Nb modified PZT/PVDF (volume fraction 70/30) composite show higher dielectric and piezoelectric properties than the others, εr=156.6, d33=69pC/N and kp=0.358.

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

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 ◽

Volume Fraction ◽

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.