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.

THE STUDY OF HIGH DIELECTRIC CONSTANT MECHANISM OF La-DOPED Ba0.67Sr0.33TiO3 CERAMICS

2018 ◽  
Vol 25 (02) ◽  
pp. 1850056
Author(s):  
JING XU ◽  
BO HE ◽  
HAN XING LIU
Keyword(s):  
Dielectric Constant ◽  
Rare Earth ◽  
High Dielectric Constant ◽  
Temperature Stability ◽  
Current Voltage ◽  
Microstructure Model ◽  
Bst Ceramics ◽  
High Dielectric ◽  
Rare Earth La ◽  
La Doped

It is a common and effective method to enhance the dielectric properties of BST ceramics by adding rare-earth elements. In this paper, it is important to analyze the cause of the high dielectric constant behavior of La-doped BST ceramics. The results show that proper rare earth La dopant ([Formula: see text]) may greatly increase the dielectric constant of BST ceramics, and also improve the temperature stability, evidently. According to the current–voltage ([Formula: see text]–[Formula: see text]) characteristics, the proper La-doped BST ceramics may reach the better semiconductivity, with the decrease and increase in La doping, the ceramics are insulators. By using the Schottky barrier model and electric microstructure model to find the surface or grain boundary potential barrier height, the width of the depletion layer and grain size do play an important role in impacting the dielectric constant.

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

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.

Electrocaloric properties of high dielectric constant ferroelectric ceramics

2007 ◽  
Vol 27 (13-15) ◽  
pp. 4021-4024 ◽  
Author(s):  
Gaël Sebald ◽  
Sébastien Pruvost ◽  
Laurence Seveyrat ◽  
Laurent Lebrun ◽  
Daniel Guyomar ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Ferroelectric Ceramics ◽  
High Dielectric

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.

scholarly journals Heat-Resistant Ferroelectric-Polymer Nanocomposite with High Dielectric Constant

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1439 ◽  
Author(s):  
Nikolay Mukhin ◽  
Valentin Afanasjev ◽  
Irina Sokolova ◽  
Dmitry Chigirev ◽  
Rene Kastro ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Composite Material ◽  
High Dielectric Constant ◽  
Composite Coatings ◽  
Polymer Nanocomposite ◽  
Ferroelectric Ceramics ◽  
Frequency Spectra ◽  
Ferroelectric Polymer ◽  
Heat Resistant ◽  
High Dielectric

The high dielectric constant ferroelectric-polymer nanocomposite was developed for producing the heat-resistant and chemical stable planar layers. According to the composite coatings formation conditions, the following value ranges of dielectric constant and loss factor were received: 30–400 for dielectric constant and 0.04–0.1 for loss tangent, accordingly. Unlike of composite components, the obtained composite material is characterized by thermo-stability of electrical parameters up to 250 °C. The dielectric frequency spectra of the composite exhibit two clearly visible peaks in contrast to the spectra of the polymer and ferroelectric ceramics. The developed composite material can be used as a built-in film capacitors material in microelectronic devices.

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.

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