High pressure treated ZnO ceramics towards giant dielectric constants

2014 ◽  
Vol 2 (39) ◽  
pp. 16740-16745 ◽  
Author(s):  
Xuhai Li ◽  
Liang Xu ◽  
Lixin Liu ◽  
Yuan Wang ◽  
Xiuxia Cao ◽  
...  
Keyword(s):  
High Pressure ◽  
Dielectric Loss ◽  
Porous Ceramics ◽  
Dielectric Constants ◽  
Low Dielectric ◽  
Giant Dielectric ◽  
Zno Ceramics

We first synthesized ZnO porous ceramics with a giant permittivity of 104 and low dielectric loss using a high pressure treating method.

scholarly journals Colossal dielectric constant of NaNbO3 doped BaTiO3 ceramics

2016 ◽  
Vol 34 (2) ◽  
pp. 322-329 ◽  
Author(s):  
Wan Q. Cao ◽  
Ling F. Xu ◽  
Mukhlis M. Ismail ◽  
Li L. Huang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Traditional Approach ◽  
Temperature Stability ◽  
Bound State ◽  
High Energy ◽  
Low Dielectric ◽  
Giant Dielectric ◽  
Giant Dielectric Constant ◽  
High Dielectric

AbstractBaTiO3 ceramics doped with 0.40 mol% NaNbO3 were prepared using a traditional approach by sintering at temperature of 1250 °C to 1290 °C. The prepared ceramics was characterized by very good dielectric properties, such as high dielectric constant (1.5 × 105), low dielectric loss (0.1), and good dielectric temperature stability in the −40 °C to 100 °C range for the sample sintered below 1270 °C. The dielectric characteristics obtained with XPS confirmed that Ti4+ ions remain in the state without any change. The huge increase in dielectric constant in NaNbO3 doped BaTiO3 samples occurs when large amount of Ba2+ ions are excited to a high energy bound state of Ba2+ − e or Ba+ to create electron hopping conduction. For samples with the content of NaNbO3 higher than 0.40 mol%, or sintering temperature higher than 1280 °C, compensation effect is dominated by cation vacancies with sharply decreasing dielectric constant and increased dielectric loss. The polaron effect is used to explain the relevant mechanism of giant dielectric constant appearing in the ferroelectric phase.

Enhancement of Dielectric Constants in Strontium Titanate through Mg and Al Doping

2014 ◽  
Vol 608 ◽  
pp. 193-199 ◽  
Author(s):  
Oratai Jongprateep ◽  
Jednupong Palomas ◽  
Tunchanoke Khongnakhon
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Strontium Titanate ◽  
Undoped Sample ◽  
Dielectric Constants ◽  
Fuel Cell Vehicles ◽  
Low Loss ◽  
Al Doping ◽  
Low Dielectric ◽  
High Dielectric

Dielectric capacitors can be utilized in powder conversion systems of applications such as hybrid-electric and fuel cell vehicles. In order to fabricate capacitors that are suitable for practical uses, the materials should have moderately high dielectric constants, while retaining low loss. In this study, strontium titanate and strontium titanate samples doped with 10, 20, 30 at% of Mg and Al were tested for dielectric permittivity and dielectric loss. The results indicated that an increase in the amount of dopants led to enhancement of dielectric constants. The value of dielectric constant of strontium titanate with 30 at% Mg was four times higher than that of the undoped strontium titanate, while the samples with 30 at% Al could achieve the dielectric constant five times higher than that of the undoped sample. Low dielectric loss, in the range between 0.001-0.024, was observed.

Giant dielectric response and low dielectric loss in Al2O3 grafted CaCu3Ti4O12 ceramics

2015 ◽  
Vol 117 (9) ◽  
pp. 094103 ◽  
Author(s):  
A. Rajabtabar-Darvishi ◽  
R. Bayati ◽  
O. Sheikhnejad-Bishe ◽  
L. D. Wang ◽  
W. L. Li ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Dielectric Response ◽  
Low Dielectric ◽  
Giant Dielectric

Fabrication of functionalized graphene filled carboxylated nitrile rubber nanocomposites as flexible dielectric materials

2017 ◽  
Vol 1 (4) ◽  
pp. 780-788 ◽  
Author(s):  
Rakesh Manna ◽  
Suneel Kumar Srivastava
Keyword(s):  
Tensile Strength ◽  
Dielectric Loss ◽  
Dielectric Materials ◽  
Nitrile Rubber ◽  
Dielectric Constants ◽  
Functionalized Graphene ◽  
Elongation At Break ◽  
Low Dielectric ◽  
Rubber Nanocomposites ◽  
High Dielectric

XNBR/GNS–HDA nanocomposites exhibited enhanced tensile strength, elongation at break, reduced Young's modulus and high dielectric constants at low dielectric loss.

Very low dielectric loss and giant dielectric response with excellent temperature stability of Ga 3+ and Ta 5+ co-doped rutile-TiO 2 ceramics

2017 ◽  
Vol 123 ◽  
pp. 15-23 ◽  
Author(s):  
Wattana Tuichai ◽  
Nateeporn Thongyong ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Pornjuk Srepusharawoot ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Dielectric Response ◽  
Temperature Stability ◽  
Low Dielectric ◽  
Giant Dielectric ◽  
Co Doped

Electron-pinned defect dipoles in (Li, Al) co-doped ZnO ceramics with colossal dielectric permittivity

2020 ◽  
Vol 8 (9) ◽  
pp. 4764-4774 ◽  
Author(s):  
Dong Huang ◽  
Wen-Long Li ◽  
Zhi-Fu Liu ◽  
Yong-Xiang Li ◽  
Cuong Ton-That ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Co Doping ◽  
Low Dielectric ◽  
Doped Zno ◽  
Colossal Dielectric Constant ◽  
Zno Ceramics ◽  
Co Doped

The colossal dielectric constant and relatively low dielectric loss (εr = 9862 and tan δ = 0.159) in ZnO ceramics have been achieved via acceptor and donor co-doping method.

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