Influence of ZrO2 on Dielectric Properties of Ba1-xSrxTiO3 Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 79-80
Author(s):  
Hao Xue ◽  
He Ping Zhou ◽  
Chen Ai
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Temperature Dependence ◽  
Phased Array ◽  
Solid State Reactions ◽  
Phased Array Antennas ◽  
Dielectric Tunability ◽  
Array Antennas

Ba1-xSrxTiO3 ceramic (BST) was one of the promising materials applied in phased array antennas due to its excellent dielectric properties. Ba1-xSrxTiO3 ceramic was prepared by traditional solid state reactions. Effects of different amount of ZrO2 as additive upon the dielectric properties of BST were investigated. The analyzed results showed that, as the amount of ZrO2 increasing, the dielectric constant and temperature dependence of dielectric constant of this ceramic both decreased, while its dielectric tunability kept high value.

Dielectric Properties of Al2O3-Doped Barium Strontium Titanate for Application in Phased Array Antennas

1999 ◽  
Vol 38 (Part 1, No. 9A) ◽  
pp. 5154-5161 ◽  
Author(s):  
Long Wu ◽  
Yih-Chien Chen ◽  
Yi-Ping Chou ◽  
Yuan-Tu Tsai ◽  
Sheng-Yuan Chu
Keyword(s):  
Dielectric Properties ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Phased Array ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Barium Strontium

Effect of CaTiO3 Content on the Dielectric Properties of Ba0.5Sr0.5TiO3

2007 ◽  
Vol 280-283 ◽  
pp. 89-90
Author(s):  
Chun Lai Xu ◽  
He Ping Zhou
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Dielectric Loss ◽  
Solid State Reactions ◽  
Dielectric Loss Increase ◽  
Resultant Material

In this paper, a microwave material (Ba0.85Ca0.15)0.5Sr0.5TiO3 with 5 wt% MgO additive was prepared by traditional solid-state reactions, i.e., mixing BaTiO3 and SrTiO3 powders and then doping CaTiO3 and MgO. It was found that, with the increasing CaTiO3 content, the dielectric constant of the resultant material decreases and the tunability and dielectric loss increase.

Fabrication and Characterization of Barium Strontium Titanate and Non-Ferroelectric Oxide Composites

1994 ◽  
Vol 360 ◽  
Author(s):  
E. Ngo ◽  
S. Stowell ◽  
L.C. Sengupta ◽  
M.E. O'day ◽  
R Lancto
Keyword(s):  
Dielectric Constant ◽  
Phased Array ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Tan Δ ◽  
High Level ◽  
Oxide Composites

AbstractVarious composites of BSTO combined with other nonelectrically active oxide ceramics have been formulated. In general, the composites have adjustable electronic properties which can be tailored for use in various electronic devices. Two applications, which are of interest in regard to the composites being discussed here, are phased array antennas and capacitor-varistor monolithic devices. For the phased array antennas, these properties include reduced dielectric constants, ε′, where ε = ε′ - iε″, and loss tangents, tan δ. The reduction of the dielectric constant and lowering of the loss tangents reditce the overall impedance mismatch and the insertion loss of the device. In addition, the overall tunability, change in the dielectric constant with applied voltage, is maintained at a sufficiently high level for all dielectric constants of interest. Another application (for one of the composite materials) is a combined capacitorvaristor device. In general, this would be used to protect against spurious voltage surges and voltage transients in electronic micro-circuits. The microstructures, including grain size and phase analysis, have been examined using SEM and X-ray diffraction.

Electrical Characteristics of Barium Strontium Titanate-Oxide Composite Films

1994 ◽  
Vol 360 ◽  
Author(s):  
S. Sengupta ◽  
L.C. Sengupta ◽  
S. Stowell ◽  
D.P. Vijay ◽  
S.B. Desu
Keyword(s):  
Dielectric Constant ◽  
Phased Array ◽  
Electronic Devices ◽  
Composite Films ◽  
Ceramic Composites ◽  
Electrical Characteristics ◽  
Krypton Fluoride ◽  
Phased Array Antennas ◽  
Oxide Composite ◽  
Array Antennas

AbstractIn a previous work. composites of BSTO combined with other nonelectrically active oxide ceramics have been formulated and have demonstrated adjustable electronic properties which can be tailored for use in various electronic devices. One application has been for use in phased array antennas and insertion has been accomplished into several working antenna systems. To further accommodate the frequencies required by these phased array antennas, thin films of the composites have been fabricated using a Krypton Fluoride excimer laser as an ablation source. The electrical properties, including the dielectric constant and the tunability (change in the dielectric constant with applied voltage) have been measured. The results have been compared to those obtained for the bulk, ceramic composites and other BSTO/oxide composite thin film structures.

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