Improving fatigue properties, temperature stability and piezoelectric properties of KNN-based ceramics via sintering in reducing atmosphere

2021 ◽  
Author(s):  
Zhenyong Cen ◽  
Zhihao Dong ◽  
Ze Xu ◽  
Fang-Zhou Yao ◽  
Limin Guo ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Fatigue Properties ◽  
Reducing Atmosphere

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.

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

Enhanced piezoelectric properties and temperature stability of Bi4Ti3O12-based Aurivillius ceramics via W/Nb substitution

2019 ◽  
Vol 39 (4) ◽  
pp. 957-962 ◽  
Author(s):  
Xinchun Xie ◽  
Tianzi Wang ◽  
Zhiyong Zhou ◽  
Guofeng Cheng ◽  
Ruihong Liang ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Temperature Stability

High Piezoelectric Properties and High TC in KNN-Based Lead-Free Ceramics Sintered in Reducing Atmosphere

2018 ◽  
Vol 281 ◽  
pp. 628-633
Author(s):  
Yi Chao Zhen ◽  
Zhen Yong Cen ◽  
Wei Feng ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Piezoelectric Properties ◽  
Rhombohedral Phase ◽  
Lead Free ◽  
Reducing Atmosphere ◽  
Lead Free Ceramics ◽  
Commercial Applications ◽  
T Phase ◽  
Sintering Method ◽  
Mn Doped ◽  
Piezoelectric Constants

Lead-free MnO doped 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3(abbreviate as KNN-0.045BNZ) ceramics have been prepared by a conventional solid-state sintering method in a reducing atmosphere. The addition of MnO suppresses grain growth and eliminates the liquid phase. MnO dopant changes the crystalline structures of KNN-0.045BNZ ceramics from the classical Morphotropic Phase Boundary (MPB) with rhombohedral phase (R) and tetragonal phase (T) to the suppressed MPB with R/T phase. The 0.4% MnO doped KNN-0.045BNZ ceramics show an excellent electrical properties with quasi static piezoelectric constantd33=300 pC/N, Curie temperatureTC= 350 °C, insulation resistivity ρ=4.83 × 1011(Ω・cm), and high field piezoelectric constants =438 pm/V (atEmax= 25 kV/cm). The results indicate that the 0.4%Mn doped KNN-0.045BNZ ceramic is a promising lead-free piezoelectric candidate material for commercial applications.

High-performance, high-temperature piezoelectric BiB3O6 crystals

2015 ◽  
Vol 3 (2) ◽  
pp. 329-338 ◽  
Author(s):  
Fapeng Yu ◽  
Qingming Lu ◽  
Shujun Zhang ◽  
Hewei Wang ◽  
Xiufeng Cheng ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Piezoelectric Sensor ◽  
High Temperature Stability ◽  
Sensor Applications

BiB3O6 crystals possess large piezoelectric coefficients and high-temperature stability of their piezoelectric properties, which is promising for piezoelectric sensor applications.

Structure and electrical properties of (0.965 − x)(K0.48Na0.52)NbO3–xBiGaO3–0.035(Bi0.5Na0.5)ZrO3 piezoelectric ceramics

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57210-57216 ◽  
Author(s):  
Jie Xing ◽  
Zhi Tan ◽  
Jing Yuan ◽  
Laiming Jiang ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Piezoelectric Ceramics ◽  
Lead Free

(0.965 − x)(K0.48Na0.52)NbO3–xBiGaO3–0.035(Bi0.5Na0.5)ZrO3 [(0.965 − x)KNN–xBG–BNZ] lead-free piezoelectric ceramics were prepared using normal sintering for improving the piezoelectric properties and temperature stability of KNN-based ceramics.

Sign in / Sign up

Export Citation Format

Share Document