Analytical Electron Microscopy of Ferroelectric BaTiO3

1980 ◽  
Vol 38 ◽  
pp. 364-365
Author(s):  
M. L. Mecartney ◽  
R. Sinclair
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Analytical Electron Microscopy ◽  
X Rays ◽  
Energy Dispersive Analysis ◽  
Ferroelectric Domain Structure ◽  
Analytical Electron ◽  
The Subject ◽  
Commercial Sources ◽  
High Dielectric

Ferroelectric BaTiO3 has been the subject of TEM investigations since the early 1960’s(1,2). However most attention has been focussed on the ferroelectric domain structure in single crystals. This current work involves the analysis of polycrystalline, ferroelectric BaTiO3 from various commercial sources. This material is used for high capacitance capacitors because of its high dielectric constant. Various dopants (Zr and Bi oxides predominantly) must be added to stabilize the high dielectric constant over a range of temperatures(3). Impurities such as Al2O3 and SiO2 can also be present due to ceramic processing procedures. An analysis of this material was performed using TEM and energy dispersive analysis of x-rays (EDAX) in order to understand better the effects of these dopants and impurities on the structure and chemical composition of BaTiO3.

Enhanced performance of supercapacitors by constructing a “mini parallel-plate capacitor” in an electrode with high dielectric constant materials

2020 ◽  
Vol 8 (32) ◽  
pp. 16661-16668
Author(s):  
Huayao Tu ◽  
Shouzhi Wang ◽  
Hehe Jiang ◽  
Zhenyan Liang ◽  
Dong Shi ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Carbon Fiber ◽  
Parallel Plate ◽  
Sandwich Structure ◽  
High Dielectric Constant ◽  
Parallel Plate Capacitor ◽  
Plate Capacitor ◽  
Fiber Metal ◽  
High Dielectric ◽  
Mini Plate

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.

Skin–core structured fluorinated MWCNTs: a nanofiller towards a broadband dielectric material with a high dielectric constant and low dielectric loss

2018 ◽  
Vol 6 (9) ◽  
pp. 2370-2378 ◽  
Author(s):  
Yang Liu ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
Yulong Li ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Dielectric Material ◽  
Epoxy Composite ◽  
Low Dielectric ◽  
High Dielectric

A novel skin–core structured fluorinated MWCNT nanofiller was prepared to fabricate epoxy composite with broadband high dielectric constant and low dielectric loss.

Atomistic prediction on the configuration- and temperature-dependent dielectric constant of Be0.25Mg0.75O superlattice as a high-κ dielectric layer

2021 ◽  
Author(s):  
Gyuseung Han ◽  
In Won Yeu ◽  
Kun Hee Ye ◽  
Seung-Cheol Lee ◽  
Cheol Seong Hwang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dft Calculations ◽  
Bond Length ◽  
Dielectric Layer ◽  
Room Temperature ◽  
High Dielectric Constant ◽  
Temperature Dependent ◽  
High Dielectric

Through DFT calculations, a Be0.25Mg0.75O superlattice having long apical Be–O bond length is proposed to have a high bandgap (>7.3 eV) and high dielectric constant (∼18) at room temperature and above.

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