Core-Shell Structure and Dielectric Properties of Ba0.991 Bi0.006 TiO3 @Nb2 O5 -Co3 O4 Ceramics

2016 ◽  
Vol 99 (5) ◽  
pp. 1664-1670 ◽  
Author(s):  
Yu Liu ◽  
Bin Cui ◽  
Yan Wang ◽  
Rong Ma ◽  
Mengqian Shangguan ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Microstructures and Highly Accelerated Lifetime Test of X5R Type BaTiO3-Based Ni-MLCC with Ultra-Thin Active Layers

2014 ◽  
Vol 602-603 ◽  
pp. 695-699
Author(s):  
Hui Ling Gong ◽  
Xiao Hui Wang ◽  
Shao Peng Zhang ◽  
Xin Ye Yang ◽  
Long Tu Li
Keyword(s):  
Dielectric Properties ◽  
Shell Structure ◽  
Casting Process ◽  
Thin Layers ◽  
Core Shell ◽  
Active Layers ◽  
Transmission Electron ◽  
Lifetime Test ◽  
Accelerated Lifetime ◽  
Core Shell Structure

Microstructure control in thin-layer multilayer ceramic capacitors (MLCCs) is one of the challenges for increasing capacitive volumetric efficiency and high voltage dielectric properties. In this paper, the X5R-MLCCs with ultra-thin dielectric layers (~1.2 μm) owning uniform grain size distribution were prepared by wet casting process. The microstructures and dielectric properties of the MLCCs were investigated. The existence of core-shell structure was proved by transmission electron microscopy observation and energy dispersive spectroscopy analysis. The existence of core-shell structure makes the temperature coefficient of capacitance (TCC) performance meet X5R standard. Moreover, a highly accelerated lifetime test (HALT) result shows that MLCCs with ultra-thin layers under high electric field are more easily to fail with increasing test temperatures. And the results reveal that the activation energy is similar to the value reported for mid-dielectric constant dielectrics.

Dielectric properties and impedance analysis of BaTiO 3 -based ceramics with core-shell structure

2017 ◽  
Vol 43 (11) ◽  
pp. 8449-8458 ◽  
Author(s):  
Weijin Chen ◽  
Hua Hao ◽  
Yang Yang ◽  
Cheng Chen ◽  
Millicent Appiah ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Shell Structure ◽  
Impedance Analysis ◽  
Core Shell ◽  
Core Shell Structure

Effect of Ho/Mg Ratio on Formation of Core-shell Structure in BaTiO3and on Dielectric Properties of BaTiO3Ceramics

2002 ◽  
Vol 41 (Part 1, No. 11B) ◽  
pp. 6934-6937 ◽  
Author(s):  
Andrei Kirianov ◽  
Tomoya Hagiwara ◽  
Hiroshi Kishi ◽  
Hitoshi Ohsato
Keyword(s):  
Dielectric Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

scholarly journals Exotic Manganese Dioxide Structures in Niobium Oxides Capacitors

2012 ◽  
Vol 18 (S5) ◽  
pp. 99-100 ◽  
Author(s):  
C. Nico ◽  
M.R.N. Soares ◽  
M. Matos ◽  
R. Monteiro ◽  
M. P. F. Graça ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Dielectric Properties ◽  
Shell Structure ◽  
Niobium Oxide ◽  
Good Alternative ◽  
Grain Structure ◽  
Electrolytic Capacitor ◽  
Core Shell ◽  
Niobium Oxides ◽  
Core Shell Structure

The production of a Tantalum solid electrolytic capacitor requires the impregnation of MnO2 by pyrolysis in one of the several manufacturing steps. It has been reported that niobium oxides are a good alternative, presenting potentially better dielectric properties and a better cost effectiveness. Thus, it is important to study the conditions and the effect of the MnO2 impregnation on niobium oxide in order to understand and optimize the parameters of this process. The morphology and microstructure of the anode is one of the most important aspects that interfere with the dielectric properties of the capacitor. In this work, it is presented a study of the morphology and microstructure of different niobium oxide anodes after electrochemical oxidation (NbO/Nb2O5 core-shell grain structure), and after MnO2 impregnation with different pyrolysis temperatures. This impregnation is made by dipping the anodes, with the NbO/Nb2O5 core-shell structure, in a slurry of Mn(NO3)2. Heating this slurry while the anode is dipped, will lead to a pyrolysis reaction where the liberation of NO2 occurs as a gas, and where the product MnO2 solidifies around the grains.

Improved dielectric properties and microwave absorbing properties of SiC Nanorods/Ni core-shell structure

2017 ◽  
Vol 10 (06) ◽  
pp. 1750069 ◽  
Author(s):  
Huijing Yang ◽  
Qinglu Wang ◽  
Li Wang ◽  
Zelin Zhang ◽  
Yuanlin Li ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorption ◽  
Shell Structure ◽  
Solution Method ◽  
Core Shell ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Core Shell Structure ◽  
Microwave Absorbing

We synthesized SiC nanorods/Ni core-shell structure (SiCR-Ni) by a facile solution method and researched their dielectric and microwave absorption properties. The dielectric and microwave absorbing properties of SiCR-Ni are superior to SiC nanorods (SiC[Formula: see text]. The maximum absorption peak of SiCR-Ni is almost three times that of SiCR. The bandwidth of effective absorption of SiCR-Ni covers 64% of [Formula: see text]-band. The improved properties of SiCR-Ni originate from multi-polarization in the special core-shell structure of SiCR-Ni.

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