Ferroelectric and piezoelectric properties of lead-free (K,Na,Li)(Nb,Ta,Sb)O3 ceramics fabricated by using a citric-acid-assisted modified sol-gel method

2012 ◽  
Vol 61 (6) ◽  
pp. 966-970 ◽  
Author(s):  
Ju Sung Kim ◽  
Jong Pil Kim ◽  
Chang Won Ahn ◽  
Ill Won Kim ◽  
Byung Moon Jin
Keyword(s):  
Citric Acid ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ferroelectric And Piezoelectric Properties

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.

Ferroelectric and piezoelectric properties of Ba(Ti0.89Sn0.11)O3 thin films prepared by sol–gel method

2015 ◽  
Vol 638 ◽  
pp. 168-172 ◽  
Author(s):  
Zhaowang Zhu ◽  
Xinli Guo ◽  
Zengmei Wang ◽  
Guoliang Yuan ◽  
Yiping Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ferroelectric And Piezoelectric Properties

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.

Photoluminescence, Ferroelectric, Dielectric and Piezoelectric Properties of Sol-Gel-Derived Er-Doped KNN-LN Lead-Free Multifunctional Ceramics

2014 ◽  
Vol 90 ◽  
pp. 19-24 ◽  
Author(s):  
Xiao Wu ◽  
Mei Lin ◽  
Chi Man Lau ◽  
Kin Wing Kwok
Keyword(s):  
Near Infrared ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
Host Lattice ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Er Doped ◽  
Dielectric And Piezoelectric Properties

A sol-gel method has been utilized to prepare lead-free 2 mol% Er-doped K0.5Na0.5NbO3-xLiNbO3 (Er-KNN-xLN, x = 0, 0.08 and 0.10) ceramics. The X-ray diffraction results show that the ceramics have the perovskite structure and Er3+ ions have diffused into the host lattice. Compared to the solid-state reaction method, the sol-gel method is favor to reduce the sintering temperatures (~ 50 °C) of ceramics. Better compositional homogeneity, as well as finer and uniform grains is resulted from the sol-gel process, which have been confirmed by the scanning electron microscope images. The photoluminescence properties of ceramic bulks have been systemically studied. Under the excitation of 980 nm, the ceramics exhibit visible up-conversion green (510-570 nm) and red (640-685 nm) emissions. The emission colors of them are located in the yellowish green region. The down-conversion emissions in near-infrared (1450-1650 nm) and mid-infrared (2600-2870 nm) regions have been exhibited. The ferroelectric, dielectric and piezoelectric properties of ceramics have also been investigated. Because of the good electrical and excellent photoluminescence performances, our sol-gel-derived Er-doped KNN-LN ceramics should have great potential for multifunctional optoelectronic applications, such as optical-electro integrated materials and devices.

scholarly journals Enhanced piezoelectric properties of (Bi0.5Na0.5)1－xBax TiO3 lead-free ceramics by sol-gel method

2004 ◽  
Vol 53 (7) ◽  
pp. 2357
Author(s):  
Zhao Ming-Lei ◽  
Wang Chun-Lei ◽  
Wang Jin-Feng ◽  
Chen Hong-Cun ◽  
Zhong Wei-Lie
Keyword(s):  
Piezoelectric Properties ◽  
Sol Gel ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Lead Free Ceramics

Study on the Synthesis of Batches of the System Y-Ba-Cu-O Using Sol-Gel Method

2014 ◽  
Vol 91 ◽  
pp. 19-23
Author(s):  
Plamen Pashev ◽  
Rositsa Raykova ◽  
Yancho Hristov ◽  
Bogdan Bogdanov
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Blue Solution ◽  
Transformation Processes ◽  
Nitrate Solutions ◽  
Thermally Treated

The study presented deal with preparation of batches of the system Y-Ba-Cu-O using sol-gel method and citric acid as precursor. Batches with particle size of 100 nm containing each of the phases Y123 and Y211 were prepared. The stoichiometric amounts of Y, Ba and Cu oxides were dissolved in 65% HNO3 until clear blue solution was observed under heating to 80 ̊С. The nitrate solutions obtained were neutralized to pH = 6 with 25% solution of NH3 (p.a.), then С6Н8О7 was added as the gels obtained were thermally treated. The transformation processes taking place under change of temperature were studied by IR, XRD, DTA and SEM.

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