Improvement of quality factor of SrTiO 3 dielectric ceramics with high dielectric constant using Sm 2 O 3

2019 ◽  
Vol 102 (7) ◽  
pp. 3849-3853 ◽  
Author(s):  
Ting Luo ◽  
Xinxuan Shan ◽  
Jingwei Zhao ◽  
Hengheng Feng ◽  
Qi Zhang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Quality Factor ◽  
High Dielectric Constant ◽  
Dielectric Ceramics ◽  
High Dielectric

X7R type lead complex perovskite ferroelectric ceramics with high dielectric constant

1998 ◽  
Vol 13 (2) ◽  
pp. 253-256 ◽  
Author(s):  
Lijian Ruan ◽  
Longtu Li ◽  
Zhilun Gui
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Temperature Stability ◽  
Ferroelectric Ceramics ◽  
Complex Perovskite ◽  
Two Phase ◽  
Dielectric Ceramics ◽  
High Dielectric ◽  
Lead Complex ◽  
Sintering Method

A new X7R type dielectric ceramics for the PMN-BT-PT system with a high dielectric constant (4832) and a low firing temperature (1100–1130 °C) was prepared by the mixed-sintering method. The results of XRD, SEM, EDAX, and dielectric measurements showed that the dielectric ceramics is a two-phase composite with the high dielectric constant originating from the ferroelectric relaxor, and the temperature stability of the dielectric properties from two-phase coexistence.

Temperature-stable dielectric ceramics in Ba4Nd2Ti4Ta6O30/(La0.1Bi0.9)2Ti2O7 biphase system

1999 ◽  
Vol 14 (8) ◽  
pp. 3375-3378 ◽  
Author(s):  
J. Wang ◽  
X. M. Chen ◽  
J. S. Yang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Temperature Coefficient ◽  
High Dielectric Constant ◽  
Zero Temperature ◽  
Dielectric Ceramics ◽  
High Dielectric

Biphase dielectric ceramics in the system of (1 − x)Ba4Nd2Ti4Ta6O30/ x(La0.1Bi0.9) 2Ti2O7 were investigated to obtain a near-zero temperature coefficient of dielectric constant. With the increase in x, the dielectric constant increased slightly, and the temperature coefficient changed from negative to positive. High dielectric constant of ε = 143 and good temperature stabibility (τ ε = −48 ppm/ °C) were achieved in a composition of x = 0.45, and the increased dielectric loss became the new problem.

Polytypic intergrowths in barium polytitanate dielectric ceramics

1986 ◽  
Vol 44 ◽  
pp. 456-459
Author(s):  
P. K. Davies
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Ceramic Materials ◽  
Microwave Filters ◽  
Potential Candidate ◽  
Low Loss ◽  
The Past ◽  
Communications Industry ◽  
Dielectric Ceramics ◽  
High Dielectric

Over the past ten years several new ceramic materials have been developed for incorporation in high quality microwave integrated filters. A suitable ceramic dielectric microwave resonator material must have low loss in the microwave region, a low temperature coefficient of dielectric constant, and a high dielectric constant, typically 35-40. Most of the research conducted on the ceramic systems has focused upon phases in the BaO-TiO2 system. Many of the barium polytitanates have dielectric properties suited toward their use in microwave filters. Ba2Ti9O2O and BaTi4O9 are used commercially in the communications industry, and BaTi5O11 may also be a potential candidate for use in these systems.

Dielectric ceramics in the BaO–Sm2O3–TiO2–Ta2O5 quaternary system

2000 ◽  
Vol 15 (1) ◽  
pp. 125-129 ◽  
Author(s):  
X. M. Chen ◽  
Z. Y. Xu ◽  
J. Li
Keyword(s):  
Dielectric Constant ◽  
Temperature Coefficient ◽  
Quaternary System ◽  
High Dielectric Constant ◽  
Tungsten Bronze ◽  
Complex Phase ◽  
Low Dielectric ◽  
Unknown Phase ◽  
Dielectric Ceramics ◽  
High Dielectric

Dielectric ceramics in the BaO–Sm2O3–TiO2–Ta2O5 quaternary system were prepared and characterized for five typical compositions: BaSm5Ti7Ta3O30, Ba2Sm4Ti6Ta4O30, Ba3Sm3Ti5Ta5O30, Ba4Sm2Ti4Ta6O30, and Ba5SmTi3Ta7O30. The latter three compositions tended to form the tungsten–bronze phase, and the ceramics based on these compositions had a high dielectric constant (134–175) and a low dielectric loss (on the order of 10−3) but a larger temperature coefficient of the dielectric constant. Meanwhile, the former two compositions generally had a more complex phase constitution, containing the tungsten–bronze phase combined with some unknown phase, and a relatively small temperature coefficient of the dielectric constant in the temperature range of 20 to 85 °C could be achieved in these two compositions.

Research on Mechanical Design with Beidou GPS Navigation Antenna Design Terminal

2013 ◽  
Vol 345 ◽  
pp. 416-420
Author(s):  
Guo Zhi Chen ◽  
Guo Tong Chen ◽  
Jian Sun ◽  
Jing Miao
Keyword(s):  
Dielectric Constant ◽  
Microstrip Antenna ◽  
High Dielectric Constant ◽  
Mechanical Design ◽  
Relative Dielectric Constant ◽  
Satellite Navigation ◽  
Microwave Dielectric Ceramics ◽  
Microwave Dielectric ◽  
Dielectric Ceramics ◽  
High Dielectric

With advances in technology and machinery manufacturing technology, the satellite navigation system plays a more and more important role in the modern society. People demand increasingly for satellite navigation. Satellite navigation is increasingly used in military systems, so military and civilian value is higher and higher. For the satellite signal reception, microstrip antenna plays an indispensable role. As the mechanical design of microstrip antenna is simple, easy manufacture, low cost, smaller size, lighter weight, with the overall unity of active devices and integrated circuit, etc. The successful development of high dielectric constant ceramic material enables the area of microstrip antenna to narrow several times. Microwave dielectric ceramics material has some merits such as high dielectric constant, thermal stability and excellent characteristics of small dielectric loss. Different dielectric constant substrate can be prepared through changing and doping modification of process parameters, including the relative dielectric constant of microwave dielectric ceramics for more than a few dozens which can be used for different microwave frequencies. Those are important reasons for promoting the development of microstrip antenna.

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