Phase transition and piezoelectric properties of alkali niobate ceramics through composition tuning

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61989-61997 ◽  
Author(s):  
Yuanyu Wang ◽  
Nuoxin Xu ◽  
Qilong Zhang ◽  
Hui Yang
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
T Phase

(1 − x)(K0.40Na0.60)(Nb0.95Sb0.05)O3–x(Bi0.5K0.5)HfO3 lead-free piezoceramics was designed. R–O–T phase boundary has been successfully achieved, which can remarkably enhance piezoelectric properties.

Phase transition characteristics and associated piezoelectricity of potassium-sodium niobate lead-free ceramics

2015 ◽  
Vol 44 (30) ◽  
pp. 13688-13699 ◽  
Author(s):  
Yuanyu Wang ◽  
Liang Hu ◽  
Qilong Zhang ◽  
Hui Yang
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Sintering Temperature ◽  
Lead Free ◽  
Sodium Niobate ◽  
Ceramic System ◽  
Potassium Sodium Niobate ◽  
Potassium Sodium ◽  
Lead Free Ceramics ◽  
T Phase

To achieve high piezoelectric activity and a wide sintering temperature range, the ceramic system concerning (1 − x)(K0.48Na0.52)(Nb0.96Sb0.04)O3–x[Bi0.5(Na0.7Ag0.3)0.5]0.90 Zn0.10ZrO3 was designed, and the rhombohedral–tetragonal (R–T) phase boundary can drive a high d33.

PHASE TRANSITION, DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF NaNbO3–Ba0.85Ca0.15(Ti0.9Zr0.1)O3 LEAD-FREE CERAMICS

2012 ◽  
Vol 05 (03) ◽  
pp. 1250033 ◽  
Author(s):  
YUQING LEI ◽  
HONG WU ◽  
DUNMIN LIN ◽  
QIAOJI ZHENG ◽  
XIAOCHUN WU ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Solution ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
High Concentration ◽  
Lead Free Ceramics ◽  
Sintering Method ◽  
Dielectric And Piezoelectric Properties

A new lead-free solid solution of (1–x) NaNbO 3-x Ba 0.85 Ca 0.15( Ti 0.9 Zr 0.1) O 3 was prepared by a traditional sintering method and its phase transition, dielectric and piezoelectric properties were studied. Ba 0.85 Ca 0.15( Ti 0.9 Zr 0.1) O 3 diffuses into NaNbO3 lattices to form a new solid solution with perovskite structure. The addition of Ba 0.85 Ca 0.15( Ti 0.9 Zr 0.1) O 3(x≥0.025) transforms NaNbO3 from antiferroelectric to ferroelectric. The diffusive ferroelectric–paraelectric phase transition is induced in the ceramics with high concentration of Ba 0.85 Ca 0.15( Ti 0.9 Zr 0.1) O 3. The ceramics with x = 0.05–0.125 possess large Pr values of 18.6–25.5 μC/cm2. A morphotropic phase boundary between tetragonal and orthorhombic phases is formed at 0.05 < x < 0.15, leading to a significant enhancement of piezoelectric properties. The ceramic with x = 0.125 situated near the morphotropic phase boundary exhibits the optimum piezoelectric properties: d33 = 151 pC/N and kp = 31.6%.

Enhanced piezoelectric properties of (1 − x)BiFe0.98(Zn0.5Hf0.5)0.02O3-xBaTiO3 ceramics near the morphotropic phase boundary

2020 ◽  
Vol 49 (17) ◽  
pp. 5573-5580 ◽  
Author(s):  
Yunjing Shi ◽  
Hairui Bai ◽  
Fei Yan ◽  
Rui Hu ◽  
Kaikai Chen ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Phase Coexistence ◽  
T Phase

The component with the R–T phase coexistence near MPB affords an optimal piezoelectric coefficient (d33) of 130 pC N−1.

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.

Microstructure and Piezoelectric Properties of (0.996-x) K0.5Na0.5NbO3 - 0.004 BiFeO3 - x LiSbO3 Ceramics

2012 ◽  
Vol 531-532 ◽  
pp. 632-635
Author(s):  
Min Hong Jiang ◽  
Xin Yu Liu ◽  
Guo Hua Chen ◽  
Jia Feng Ma ◽  
Gui Sheng Zhu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Phase Boundary ◽  
Pore Size ◽  
Mixed Oxide ◽  
Phase Structure ◽  
Composition Range ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Compositional Dependence ◽  
Tan Δ

(0.996-x) K0.5Na0.5NbO3- 0.004 BiFeO3- x LiSbO3 (x =0.00, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07) lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. A morphotropic phase boundary between the orthorhombic and tetragonal phases was identified in the composition range of 0.03 < x < 0.06. With the content of LS increases, the size of the pores significantly decreases. However, adding larger amount of LS makes the pore size increase slightly. The (0.996-x)KNN-0.004 BF-xLS(x=0.05) ceramics possess good electrical properties: d33 = 280 pC/N, kp = 53.3%, Tc = 345 °C, εr = 1613, Tan δ =2.07%. These results show that the ceramic is a promising lead-free piezoelectric material.

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