scholarly journals Impact of Phase Structure on Piezoelectric Properties of Textured Lead-Free Ceramics

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 367 ◽  
Author(s):  
Xiaoyi Gao ◽  
Nannan Dong ◽  
Fangquan Xia ◽  
Qinghu Guo ◽  
Hua Hao ◽  
...  
Keyword(s):  
Phase Structure ◽  
Piezoelectric Properties ◽  
Rhombohedral Phase ◽  
Lead Free ◽  
Strain Behavior ◽  
Lead Free Ceramics ◽  
Textured Ceramics ◽  
Domain Configuration ◽  
The Impact ◽  
Free Strain

The impact of phase structure on piezoelectric performances of <001> textured Na0.5Bi0.5TiO3 (NBT) based lead-free ceramics was studied, including 0.88NBT-0.08K0.5Bi0.5TiO3-0.04BaTiO3 (88NBT) with morphotropic phase boundary (MPB) composition and 0.90NBT-0.07K0.5Bi0.5TiO3-0.03BaTiO3 (90NBT) with rhombohedral phase. Both textured ceramics exhibit a high Lotgering factor, being on the order of f~96%. The piezoelectric coefficients of the textured 88NBT and 90NBT ceramics are increased by 20% and 60%, respectively, comparing to their randomly oriented ceramics. The piezoelectric enhancement of 90NBT textured ceramic is three times higher than 88NBT, revealing the phase structure plays a significant role in enhancing the piezoelectric performances of textured ceramics. Of particular significance is that the 90NBT textured ceramic exhibits almost hysteresis-free strain behavior. The enhanced piezoelectric property with minimal strain hysteresis is attributed to the <001> poled rhombohedral engineered domain configuration.

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.

Phase structure, piezoelectric properties, and stability of new K0.48Na0.52NbO3–Bi0.5Ag0.5ZrO3 lead-free ceramics

2014 ◽  
Vol 25 (7) ◽  
pp. 3219-3225 ◽  
Author(s):  
Xiaopeng Wang ◽  
Jiagang Wu ◽  
Xiang Lv ◽  
Hong Tao ◽  
Xiaojing Cheng ◽  
...  
Keyword(s):  
Phase Structure ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Lead Free Ceramics

scholarly journals Improving piezoelectric properties by controlling phase structure and crystal orientation

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41788-41795 ◽  
Author(s):  
Baihui Liu ◽  
Xing Liu ◽  
Peng Li ◽  
Feng Li ◽  
Bo Shen ◽  
...  
Keyword(s):  
Grain Growth ◽  
Phase Structure ◽  
Crystal Orientation ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Templated Grain Growth ◽  
Lead Free Ceramics

〈001〉-textured (1 − x)K0.48Na0.52Nb0.96Sb0.04O3-xBi0.50(K0.48Na0.52)0.50Zr0.50Hf0.50O3 lead-free ceramics prepared by templated grain growth (TGG) method are reported in this study.

Role of antimony in the phase structure and electrical properties of potassium–sodium niobate lead-free ceramics

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14575-14583 ◽  
Author(s):  
Jiagang Wu ◽  
Hong Tao ◽  
Yuan Yuan ◽  
Xiang Lv ◽  
Xiangjian Wang ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Phase Structure ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Sodium Niobate ◽  
Potassium Sodium Niobate ◽  
Potassium Sodium ◽  
The Past ◽  
Lead Free Ceramics

In the past ten years, antimony has been reported to strongly affect the developments in the piezoelectric properties of (K,Na)NbO3 (KNN) lead-free ceramics, that is, its enhanced piezoelectric activity is closely related to the doped antimony as well its content.

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