KNN-BF Lead-Free Piezoelectric Ceramics Synthesized by Sol-Gel Method

2015 ◽  
Vol 740 ◽  
pp. 3-6
Author(s):  
Guo Yuan Cheng ◽  
Xing Hua Fu ◽  
Xin Jin ◽  
Wen Hong Tao ◽  
Yu Qin Qiang
Keyword(s):  
Comparative Analysis ◽  
Citric Acid ◽  
Dielectric Loss ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Metal Chelator

KNN-BF piezoelectric ceramics synthesized by sol-gel method in this experiment. By controlling bismuth and iron content in the system to study effects of them. We selected citric acid as metal chelator and ethylene glycol as esterification agent. PH maintained 5-6 during preparation of the sol. Sintering temperature of ceramic selected 1100°C. Preparation ceramics under these conditions and comparative analysis, the structure of ceramics is single perovskite and shap of crystals are square block. With the increase of x, properties of ceramics firstly increases and then decreases: d33, εr, Qm, Kpreaching the maximum, values of them were 136pC/N, 630(f =1KHz), 212, 0.41 respectively; dielectric loss to minimum is 0.07(f =1KHz); at this point, ceramics had best performance.

The Preparation and Properties of (Na0.5+xK0.5-2xLix)NbO3 Lead-Free Piezoelectric Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 826-829
Author(s):  
Hong Yun Ma ◽  
Yan Gai Liu ◽  
Jin Qiu Zhao ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
Phase Composition ◽  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Piezoelectric Constant ◽  
Pressureless Sintering ◽  
Gel Method ◽  
Sol Gel Method

In this paper, the KNN powders with Li+ substituted (K0.5Na0.5)+ were prepared by the sol-gel method in order to make powders pure, (Na0.50+xK0.50-2xLix) -NbO3 (x=0, 0.04, 0.06, 0.08) ceramics were prepared by pressureless sintering. The phase composition of powders was determined by XRD. The effects of the Li+ substitution on piezoelectric and ferroelectric properties of ceramics were systematically studied for determining optimal Li+ content. Li+ can significantly increase the piezoelectric constant of ceramic. When Li+ content was 0.04, piezoelectric properties of ceramics were the best, d33=115 pC/N, Pr=6.35 μC/cm2, Ec=14.24 kV/cm.

scholarly journals Influences of protective atmosphere on the characterization and properties of NaSr2Nb5O15 lead-free piezoelectric ceramics by sol–gel method

2015 ◽  
Vol 38 (6) ◽  
pp. 1479-1486 ◽  
Author(s):  
TIAN-HANG ZHANG ◽  
YAN-GAI LIU ◽  
JIN-QIU ZHAO ◽  
ZHAO-HUI HUANG ◽  
MING-HAO FANG
Keyword(s):  
Sol Gel ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Protective Atmosphere ◽  
Gel Method ◽  
Sol Gel Method

Preparation and Properties of Sr2NaNb5O15 Lead-Free Piezoelectric Ceramics by Sol-Gel Method

2013 ◽  
Vol 544 ◽  
pp. 96-100 ◽  
Author(s):  
Tian Hang Zhang ◽  
Jin Qiu Zhao ◽  
Yang Ai Liu ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
Sintering Temperature ◽  
Sol Gel ◽  
Lead Free ◽  
Pressureless Sintering ◽  
Ceramic Powders ◽  
Gel Method ◽  
Sol Gel Method ◽  
Average Size ◽  
Sintering Method ◽  
Sem Analyses

Sr2NaNb5O15 ceramic powders have been synthesized by sol-gel method, ceramics were sintered via a pressureless sintering method. The effect of calcining temperature on the phase composition and microstructure of ceramic powders were investigated by TG-DSC, XRD and SEM analyses. The influence of sintering temperature on density, microstructure and properties of the ceramics were systematically analyzed. The results showed that the optimal calcining temperature was 1300°C, the average size of ceramic powders was about 3μm. When the sintering temperature was 1300°C, the ceramics showed optimized densification and electrical properties(ρ=4.663 g/cm3, d33=45 pC/N, εr=1126, tan=0.027, Ec=17.91 kV/cm, Pr=6.72 μC/cm2, Ps=9.45 μC/cm2)

Microstructure and Properties of Fe/Al2O3 Gradient Coatings on Steel Substrate

2010 ◽  
Vol 150-151 ◽  
pp. 1325-1329
Author(s):  
Jian Fei Liu ◽  
Zhi Wang ◽  
Yin Sen Ding ◽  
Guo Pu Shi
Keyword(s):  
Adhesion Strength ◽  
Sintering Temperature ◽  
Steel Substrate ◽  
Sol Gel ◽  
Surface Hardness ◽  
Gel Method ◽  
Sol Gel Method ◽  
Chemical Combination ◽  
Gradient Coatings ◽  
Α Al2o3

The composites of Fe/Al2O3 gradient coatings on steel substrate were prepared by spraying and sol-gel method, and the microstructure and performances of the composites were analyzed. The results show that the adhesion strength of Fe/Al2O3 gradient coatings with FeAlNi transitional layers reaches 25.3MPa when the sintering temperature is 1220°C, and the surface hardness of coatings is four times higher than that of steel substrate. The coatings are mainly composed of α-Al2O3, AlFeO3 and NiFe2O4. There is no obvious hole or macro-interface, while some organization similar to the branch appears in the coatings. The bonding of Fe/Al2O3 gradient coatings and steel substrate mainly depends on adsorption, diffusion and chemical combination.

Effect of sintering temperature on structural, magnetic, magnetocaloric and critical behaviors of Ni-Cd-Zn ferrites prepared using sol-gel method

2018 ◽  
Vol 464 ◽  
pp. 91-102 ◽  
Author(s):  
Sobhi Hcini ◽  
Noura Kouki ◽  
Aref Omri ◽  
Abdessalem Dhahri ◽  
Mohamed Lamjed Bouazizi
Keyword(s):  
Sintering Temperature ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method
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