scholarly journals Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere

2021 ◽  
Author(s):  
Zhenyong Cen ◽  
Shuaishuai Bian ◽  
Ze Xu ◽  
Ke Wang ◽  
Limin Guo ◽  
...  
Keyword(s):  
Grain Size ◽  
Alkali Metal ◽  
Oxygen Vacancies ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Conventional Solid State Reaction ◽  
Sintering Aid ◽  
Reducing Atmosphere ◽  
Piezoelectric Strain ◽  
Free Material

AbstractIt is a very difficult work to sinter K0.5Na0.5NbO3 (KNN)-based materials with good reduction resistance in strong reducing atmosphere. 0.945K0.48Na0.52Nb0.96Ta0.04O3−0.055BaZrO3 + 0.03ZrO2 + y mol%MnO (KNNT−0.055BZ + 0.03Zr + yMn) ceramics sintered in reducing atmosphere were prepared successfully by conventional solid-state reaction methods. MnO dopant increases grain size at y = 5–8 due to strong lattice distortion and then decreases grain size at y = 9 due to much Mn4Nb2O9 accumulated at the grain boundary. MnO dopant as an excellent sintering aid can effectively reduce volatilization of alkali metal by decreasing the sintering temperature (Tsinter). Reducing alkali metal volatilization can greatly reduce oxygen vacancies and improve piezoelectric properties. MnO dopant can improve the anti-reduction properties. The KNNT−0.055BZ + 0.03Zr + yMn ceramics at y = 6–9 show outstanding anti-fatigue of unipolar piezoelectric strain under the synergistic effect of reduced oxygen vacancies due to reduced volatilization and increased grain size. Piezoelectric properties and temperature stability of KNNT−0.055BZ + 0.03Zr ceramics sintered in reducing atmosphere are improved simultaneously by MnO dopant. Optimum inverse piezoelectric coefficient (d 33 * ) of ceramics at y = 8 reaches up to 480 pm/V under low driving electric field E = 20 kV/cm at room temperature, and its temperature stability of d 33 * reaches 158 °C. It will be an excellent lead-free material candidate for the preparation of multilayer piezoelectric actuators co-fired with nickel electrode.

Influence of CuO Additive on Physical Properties of BaTiO3 Ceramics

2011 ◽  
Vol 687 ◽  
pp. 287-291 ◽  
Author(s):  
Zong Zhang ◽  
Jia Liang Zhang ◽  
Shou Fu Shao ◽  
Peng Zheng ◽  
Chun Lei Wang
Keyword(s):  
Grain Size ◽  
Piezoelectric Properties ◽  
Sintering Process ◽  
Solid State Reaction Technique ◽  
Conventional Solid State Reaction ◽  
Sintering Aid ◽  
Average Grain Size ◽  
The One ◽  
Dielectric And Piezoelectric Properties ◽  
Tetragonal Phase Transition

Various ceramics were prepared by the conventional solid-state reaction technique according to the compositional formula of (1-x) BaTiO3+xCuO withx= 0.00 ~ 0.05. The influence of CuO additive on microstructure, crystalline structure and dielectric and piezoelectric properties were investigated. It has been found that CuO acts like a sintering aid in the CuO-modified BaTiO3ceramics to promote the ceramic densification and suppress the abnormal grain growth during sintering process, and decreases the orthorhombic-tetragonal phase transition temperature. The CuO-modified BaTiO3ceramics show desirable microstructures with high density, small average grain size and uniform grain size distribution. For the one withx= 0.01, it has the good piezoelectric properties ofd33= 300 pC/N,kp= 0.49,k33= 0.62 andQm= 425 at room temperature, and exhibits aε'peak at -5°C and ad33maximum of 353 pC/N at 0°C, respectively.

Preparation and Characterization of (1-x)BiScO3-xPbTiO3 Ceramics by Two-Step Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 8-10 ◽  
Author(s):  
Ting Ting Zou ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Grain Size ◽  
Low Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Sintering Aid ◽  
Potential Approach ◽  
Fine Grain ◽  
Sintering Method

High-performance fine-grain (1-x)BiScO3-xPbTiO3 ceramics were prepared by two-step sintering method. Influences of sintering temperature, holding time, and composition on the microstructure and properties were discussed. The BSPT ceramics obtained via two-step sintering reaches density higher than 95% at a low temperature of 800°C without any sintering aid, and the grain size of the ceramics is also effectively controlled. Excellent piezoelectric properties between the composition of x=0.63 and x=0.64 reveals a probable MPB in this range, suggesting a potential approach to pursue high performance BSPT ceramics.

Study on the Property of Ba0.85Ca0.15Ti0.9Zr0.1O3 Lead-Free Piezoelectric Ceramics Doped with Li2CO3

2012 ◽  
Vol 549 ◽  
pp. 651-654 ◽  
Author(s):  
Zhi Wen Zhu ◽  
Xin You Huang ◽  
Hai Tang Hua ◽  
Yan Li
Keyword(s):  
Grain Size ◽  
Piezoelectric Properties ◽  
Piezoelectric Ceramics ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Doping Amount ◽  
Conventional Solid State Reaction ◽  
Reaction Method ◽  
Mechanical Coupling ◽  
Planar Electron

Ba0.85Ca0.15Ti0.9Zr0.1O3-xLi2CO3 lead-free piezoelectric ceramics (abbreviated as BCZT-xLi) were prepared by conventional solid state reaction method. The microstructure, piezoelectric properties and dielectric properties were studied for BCZT-xLi samples doped with different Li2CO3 content(x= 0, 0.05, 0.1 0.2 0.3, 0.4wt. %). The results show that the piezoelectric constant(d33), planar electron mechanical coupling coefficient(kp) and thickness electron mechanical(kt) of BCZ-T-xLi ceramics increase firstly and decreases subsequently with increasing of Li+ doping amount, the dielectric loss(tanδ) of BCZT-xLi ceramics decreases firstly and then increases at the same time while Li+ doping amount increases. But the r-elative permittivity (εr) of BCZT-xLi ceramics increases all the time. With the in-creasing of the amount of Li2CO3 doped the grain size of BCZT-Li ceramic first increases and then decreases. The BCZT-xLi ceramics display the optimum properties (d33=83, tanδ=0.035, εr=2020, kp=0.41, kt=0.046) while Li2CO3 doped amount is 0.20wt. %.

Improving piezoelectric strain and anti-reduction properties on K0.5Na0.5NbO3-based ceramics sintered in reducing atmosphere

2021 ◽  
Author(s):  
Zhenyong Cen ◽  
Ze Xu ◽  
Xiao-Hui Wang ◽  
Longtu Li
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Conventional Solid State Reaction ◽  
Reducing Atmosphere ◽  
Coexisting Phases ◽  
Piezoelectric Strain

Lead-free 0.945K0.48Na0.52Nb0.96Ta0.04O3-0.055BaZrO3+6%MnO+xZrO2 piezoelectric ceramics sintered in reducing atmosphere were prepared by conventional solid-state reaction methods. ZrO2 dopant results in the increase of rhombohedral (R) phase in orthorhombic (O)/R coexisting phases....

Improving piezoelectric properties and temperature stability for KNN‐based ceramics sintered in a reducing atmosphere

2018 ◽  
Vol 101 (9) ◽  
pp. 4108-4117 ◽  
Author(s):  
Zhenyong Cen ◽  
Yichao Zhen ◽  
Wei Feng ◽  
Peiyao Zhao ◽  
Lingling Chen ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Reducing Atmosphere

Effect of the pyrochlore (Y2Ti2O7) phase on the resistance degradation in yttrium-doped BaTiO3 ceramic capacitors

2007 ◽  
Vol 22 (9) ◽  
pp. 2539-2543 ◽  
Author(s):  
Seok-Hyun Yoon ◽  
Young-Sun Park ◽  
Jeong-Oh Hong ◽  
Dong-Sook Sinn
Keyword(s):  
Grain Size ◽  
Oxygen Vacancies ◽  
Volume Fraction ◽  
Sintering Temperature ◽  
Pyrochlore Phase ◽  
Insulation Resistance ◽  
Sintering Aid ◽  
Resistance Degradation ◽  
Ceramic Capacitors ◽  
Second Phases

Degradation of insulation resistance due to the formation of the Y2Ti2O7 (pyrochlore) phases in yttrium(Y)-doped BaTiO3 ceramics was investigated. The addition of Y2O3 and sintering aid SiO2 to the BaTiO3 ceramics caused the formation of barium-related BaSiO3 and titanium-related Y2Ti2O7 second phases. The appearance of the abnormally grown large pyrochlore grains with the increase of sintering temperature critically degraded insulation resistance at high temperatures. When the volume fraction of the pyrochlore phase increased, the resistance degradation was also observed although the grain size of the pyrochlore phase became smaller. The highly oxygen ionic conductive nature of the Y2Ti2O7 pyrochlore phase is supposed to accelerate electromigration of oxygen vacancies resulting in the resistance degradation. The formation of pyrochlore phase should be prevented to guarantee the high-temperature reliability of BaTiO3 bases ceramic capacitors.

scholarly journals High piezoelectric properties and good temperature stabilities of CuO-modified Ba(Ti0.96SnxZr0.04-x)O3 ceramics

2013 ◽  
Vol 03 (02) ◽  
pp. 1350014 ◽  
Author(s):  
Y. Q. Tan ◽  
J. L. Zhang ◽  
C. L. Wang
Keyword(s):  
Thermal Aging ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Aging Effect ◽  
Aging Behavior ◽  
Sintering Aid ◽  
Temperature Range ◽  
Dense Microstructure ◽  
The Common ◽  
High Piezoelectric Property

In order to obtain both high piezoelectric property and good temperature stability in BaTiO 3-based ceramics in the common usage temperature range, Sn 4+ and Zr 4+ are co-doped into BaTiO 3 ceramics according to the formula of Ba ( Ti 0.96 Sn x Zr 0.04-x) O 3 (BTSZ) (x = 0.01–0.4) with 1 mol% CuO being added as sintering-aid in this study. The CuO -modified BTSZ ceramics show both high piezoelectric properties and good temperature stability. Particularly, the CuO -modified Ba ( Ti 0.96 Sn 0.01 Zr 0.03) O 3 ceramic displays the high piezoelectric properties of d33 = 350 pC/N, k p = 49.5% at room-temperature and a weak temperature dependence of kp in the temperature range of -15°C and 60°C. Moreover, the CuO -modified Ba ( Ti 0.96 Sn 0.01 Zr 0.03) O 3 ceramic shows stable thermal aging behavior with the d33 being almost unchanged until the aging temperature of 100°C, which is even higher than its Curie temperature. The high piezoelectric properties of CuO -modified Ba ( Ti 0.96 Sn 0.01 Zr 0.03) O 3 ceramic were ascribed to the dense microstructure with small and uniform grain size distribution. The stable thermal aging behavior can be explained by the aging effect based on the defect dipolar model.

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

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 ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Volume Fraction ◽  
Relative Dielectric Constant ◽  
Connectivity Pattern ◽  
Conventional Solid State Reaction ◽  
Pressing Method ◽  
Dielectric And Piezoelectric Properties

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.

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