Influence of Ge and Si Doping on the Microstructure and Dielectric Properties of Barium Titanate Ceramics

2013 ◽  
Vol 464 ◽  
pp. 44-49
Author(s):  
Zhen Jiang Shen ◽  
Li Na Bing ◽  
Hong Yan Peng ◽  
Shao Hua Gong ◽  
Wei Wu
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Tetragonal Phase ◽  
High Dielectric Loss ◽  
Strong Relation ◽  
High Dielectric ◽  
Titanate Ceramics ◽  
Ge Doping ◽  
Ionic Defect ◽  
Co Doped

GeO2 has been doped solely and together with SiO2 into barium titanate ceramics by mixing and calcination. The microstructure and dielectric properties of doped BaTiO3 have been characterized. When doped in BaTiO3, Ge4+ ion could incorporated into the crystal lattice of BaTiO3 to occupied Ti4+ sites. For relative smaller Ge4+ ion, the tetragonal phase could be enhanced. As dielectric properties have strong relation to tetragonal phase. The relative permittivity could be increased in this mechanism. However, the high leakage current which induced by more ionic defect was also lead to high dielectric loss. Besides, the assemble in grain boundary by Ge4+ ion may also have effect. Results on the GeO2-SiO2 co-doped sample showed that the mechanisms of Ge doping and Si doing could happen at one time.

Dielectric Properties and Microstructure of Y-Al-Ga-Si Co-Doped Barium Titanate Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 700-704
Author(s):  
Min Jia Wang ◽  
Qi Long Zhang ◽  
Xin Hui Zhao ◽  
Hui Yang
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
Barium Titanate ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Low Dielectric ◽  
Doped Barium Titanate ◽  
Titanate Ceramics ◽  
Functional Components ◽  
Co Doped

Multilayer ceramic capacitors (MLCC) are important functional components of electronic information technology. The development of AC MLCC requires low dielectric loss and high AC breakdown voltage. In this paper, Y-Al-Ga-Si co-doped barium titanate ceramics were prepared by conventional solid state method. Microstructures, surface morphology and dielectric properties were investigated by X-ray diffraction, SEM, and LCR analyzer, respectively. Y3+ entered into the lattice of BaTiO3, replaced A-sites and B-sites, suppressed grain growth effectively, and made crystal structure change from tetragonal to pseudo-cubic, which reduced dielectric loss and lowered the Curie peak. The sintering characteristic and permittivity can be improved by the incorporation of Al and Ga. BaTiO3 -0.06Y2O3 - 0.02Ga2O3 -0.01Al2O3 -0.01SiO2 ceramics sintered at 1380°C achieved good dielectric properties: εr= ~2223, tanδ =~1.1% (at 1kHz), ΔC/C25 <~15.26% (from 55°C to 150°C).

Improved room temperature dielectric properties of Gd3+ and Nb5+ co-doped Barium Titanate ceramics

2021 ◽  
pp. 160836
Author(s):  
Khalid Mujasam Batoo ◽  
Ritesh Verma ◽  
Ankush Chauhan ◽  
Rajesh Kumar ◽  
Muhammad Hadi ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Room Temperature ◽  
Doped Barium Titanate ◽  
Titanate Ceramics ◽  
Co Doped

Preparation of barium titanate ceramics from amorphous fine particles of the Ba–Ti–O system and its dielectric properties

1995 ◽  
Vol 10 (2) ◽  
pp. 306-311 ◽  
Author(s):  
S. Wada ◽  
T. Suzuki ◽  
T. Noma
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Curie Temperature ◽  
Decomposition Method ◽  
Fine Particles ◽  
Nitrate Solution ◽  
Pressing Method ◽  
Calcination Temperatures ◽  
Grain Sizes ◽  
Titanate Ceramics

Using titanium nitrate solution stabilized by chelation, amorphous fine particles of the Ba-Ti-O system were prepared by the mist decomposition method in air. After calcination of these particles, barium titanate ceramics were prepared using the hot uniaxial pressing method, and various properties were investigated. As a result, the grain sizes could be controlled over the range from 58 nm to 187 nm by the sintering temperatures and/or the calcination temperatures, keeping the density almost constant. Moreover, the dielectric properties of the samples showed that the relative permittivity decreased with decreasing grain size, and Curie temperature also shifted to lower temperatures in the same way. In this study, we first found that Curie temperature existed in the barium titanate ceramics with grain sizes from 58 to 147 nm.

Dielectric properties of fine‐grained barium titanate ceramics

1985 ◽  
Vol 58 (4) ◽  
pp. 1619-1625 ◽  
Author(s):  
G. Arlt ◽  
D. Hennings ◽  
G. de With
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Fine Grained ◽  
Titanate Ceramics

Preparation of Potassium Niobate–Barium Titanate Ceramics Using Well-Dispersed Nanoparticles and their Dielectric Properties

2011 ◽  
Vol 485 ◽  
pp. 39-42 ◽  
Author(s):  
Kenta Yamashita ◽  
Shigehito Shimizu ◽  
Ichiro Fujii ◽  
Kouichi Nakashima ◽  
Nobuhiro Kumada ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Barium Titanate ◽  
Potassium Niobate ◽  
Conventional Sintering ◽  
Titanate Ceramics ◽  
Sintering Method

ANbO3– BaTiO3(A=K, Na, or K0.5Na0.5) system ceramics were prepared using a conventional sintering method, and their dielectric properties were investigated. It was found that the dielectric constant of KNbO3-BaTiO3and (K0.5Na0.5) NbO3- BaTiO3system ceramics did not strongly depend on temperature between 20 and 400 °C, making them useful for capacitor application.

Microwave Dielectric Properties of Gallium-Doped Hexagonal Barium Titanate Ceramics

2003 ◽  
Vol 86 (3) ◽  
pp. 511-513 ◽  
Author(s):  
Antonio Feteira ◽  
Kumaravinothan Sarma ◽  
Neil McN. Alford ◽  
Ian M. Reaney ◽  
Derek C. Sinclair
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Titanate Ceramics
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