scholarly journals Influence of Li2Co3 and V2O5 combined additions on the sintering and dielectric properties of Ca0.5Sr0.5TiO3 ceramics prepared from powders synthesized by sol-gel method

2014 ◽  
Vol 8 (2) ◽  
pp. 101-108
Author(s):  
Nouara Lamrani ◽  
Ahcène Chaouchi ◽  
Jerôme Bernard ◽  
Brahim Itaalit ◽  
David Houivet ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Lithium Carbonate ◽  
Ceramic Materials ◽  
Type I ◽  
Titanium Butoxide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Air Atmosphere

In this work, we have studied the influence of lithium carbonate (Li2CO3) associated with the vanadium oxide (V2O5) on sintering and dielectrics properties of Ca0.5Sr0.5TiO3 ceramic materials obtained from nanopowder synthesized by sol-gel method. The nanopowder was obtained by controlled mixing of titanium butoxide dissolved in butanol-2 and acetic acid with a saturated aqueous solution of calcium acetate and strontium carbonate and subsequent drying of the formed gel at 80 ?C and calcination at 1100?C. The synthesized nanopowder was mixed with different amount of additives, and then uniaxally pressed and sintered in air atmosphere at temperature determined by dilatomertic measurements. The pure Ca0.5Sr0.5TiO3 sample obtained by this process required a sintering temperature around 1500?C. The addition of Li2CO3 combined with V2O5 improved sinterability and caused a shift of dilatimeric shrinkage curve to much lower temperatures. Thus, dense ceramics (98% of theoretical density) were obtained at sintering temperature ? 1300?C. The effect of adding Li2CO3-V2O5 on the structure of ceramics and the dielectric properties is discussed and show that type I dielectric properties (linear variation of the permittivity) are conserved, but with an increase of dielectric loss.

Ferroelectric and Dielectric Properties of La2O3-Doped BaTiO3 Ceramics

2011 ◽  
Vol 418-420 ◽  
pp. 721-725
Author(s):  
Yi Shan Wang ◽  
Xiang Yun Deng ◽  
Yan Jie Zhang ◽  
Ren Bo Yang ◽  
Li Ren Han ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Constant Increase ◽  
Dielectric Constant Increase

The different concentration La2O3-doped BaTiO3 ceramics were prepared by sol-gel method. The ferroelectric and dielectric properties of the ceramics are characterized by TF analyzer 2000. With the increased amount of La2O3-doped, the dielectric constant increase gradually, when the sintering temperature is 1250 °C, the dielectric constant has reached 4648 for La2O3 with 0.4％-doped. With the temperature increased the dielectric constant of La-BaTiO3 increase gradually, when the sintering temperature is 1290 °C, the dielectric constant has reached 7066 for La2O3 with 0.4％-doped.

Preparation and Characterization of Citrate Sol-Gel Derived Ba(Zr,Ti)O3 Ceramics with Al2O3 Addition

2007 ◽  
Vol 336-338 ◽  
pp. 76-78
Author(s):  
Jing Pei ◽  
Zhen Xing Yue ◽  
Fei Zhao ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Sintering Behavior ◽  
Gel Method ◽  
Sol Gel Method

The nano-sized Ba(Zr0.2Ti0.8)O3 powder was prepared by citrate sol-gel method. The crystal structure and the particle size of the powder were characterized by XRD. The morphology of calcined powder and the sintered ceramics was observed by TEM and SEM, respectively. The particle size of the powders calcined at 600oC is about 10 nm. The dense ceramics can be obtained at sintering temperature of 1220 oC, which is much lower than that of the powder prepared by the conventional solid method. The effects of Al2O3 additive on the sintering behavior, microstructure and dielectric properties of Ba(Zr0.2Ti0.8)O3 ceramics were also investigated.

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.

Tunability and dielectric properties of Ba0.55Sr0.45TiO3/MgO composites prepared by heterogeneous precipitation method and sol-gel method

2017 ◽  
Vol 520 (1) ◽  
pp. 75-82
Author(s):  
Hai Jiang ◽  
Xiao-Hong Wang ◽  
Jing Tao ◽  
Hua-Bo Wang ◽  
Fang-yuan Chen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Sol Gel ◽  
Precipitation Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
Heterogeneous Precipitation

Consequence of pH variation on the dielectric properties of Cr-doped lithium ferrite nanoparticles synthesized by the sol–gel method

2015 ◽  
Vol 645 ◽  
pp. 171-177 ◽  
Author(s):  
Manish Srivastava ◽  
R.K. Mishra ◽  
Jay Singh ◽  
Neha Srivastava ◽  
Nam Hoon Kim ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
Lithium Ferrite ◽  
Ph Variation ◽  
Gel Method ◽  
Sol Gel Method

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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