Maxwell-Wagner relaxations and their contributions to the high permittivity of calcium copper titanate ceramics

2007 ◽  
Vol 75 (1) ◽  
Author(s):  
Wei Li ◽  
Robert W. Schwartz
Keyword(s):  
High Permittivity ◽  
Calcium Copper Titanate ◽  
Titanate Ceramics

Novel Doping Mechanism for Very-High-Permittivity Barium Titanate Ceramics

2005 ◽  
Vol 81 (7) ◽  
pp. 1957-1960 ◽  
Author(s):  
Finlay D. Morrison ◽  
Derek C. Sinclair ◽  
Janet M. S. Skakle ◽  
Anthony R. West
Keyword(s):  
Barium Titanate ◽  
High Permittivity ◽  
Doping Mechanism ◽  
Titanate Ceramics ◽  
Very High

Microstructure and Electrical Properties of Calcium Copper Titanate Ceramics

2007 ◽  
Vol 561-565 ◽  
pp. 551-555 ◽  
Author(s):  
Lai Jun Liu ◽  
Hui Qing Fan
Keyword(s):  
Electrical Properties ◽  
Dielectric Permittivity ◽  
High Frequency ◽  
Low Frequency ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Cell Parameters ◽  
Grain Sizes ◽  
Calcium Copper Titanate ◽  
Titanate Ceramics

The effect of stoichiometry, i.e. Ca/Cu ratios (CaCu3xTi4O12, x = 0.8, 0.9, 1.0, 1.1 and 1.2) on the microstructure and electrical properties was investigated. The grain sizes of CaCu3xTi4O12 composition increased sharply with the increase of copper, from ~1 μm with x = 0.8 to ~50 μm with x = 1.2. The real part of dielectric permittivity changed dramatically, the pellet with x = 1.0 had the highest dielectric permittivity ~160, 000 at 1 kHz. Furthermore, the dielectric permittivity of all pellets was impressively large values (between 10, 000 to 1, 000,000 at 100 Hz) and was nearly constant over a wide frequency range between 100 Hz to ~100 MHz. However, the dielectric permittivity of CaCu3xTi4O12 composition is not consistent with the amount of copper and cell parameters and grain sizes. Impedance spectroscopy exhibited that the CaCu3xTi4O12 composition had two semicircle at least at high frequency (~ 107 Hz) and low frequency (<100 Hz), respectively. The grain and grain boundary of the compositions had different impedance and relaxation behavior.

Colossal dielectric performance of pure barium titanate ceramics consolidated by spark plasma sintering

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75422-75429 ◽  
Author(s):  
X. Yang ◽  
D. Li ◽  
Z. H. Ren ◽  
R. G. Zeng ◽  
S. Y. Gong ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Barium Titanate ◽  
Dielectric Permittivity ◽  
Oxygen Vacancies ◽  
High Permittivity ◽  
Low Dielectric ◽  
Plasma Sintering ◽  
Dielectric Performance ◽  
Spark Plasma ◽  
Titanate Ceramics

The pure BaTiO3 nanoceramics have a high permittivity up to 6 × 104 and a low dielectric loss. The polaron dipoles configured by oxygen vacancies and Ti3+ cations within grains could contribute to the colossal dielectric permittivity of the ceramics.

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

2019 ◽  
Vol 102 (9) ◽  
pp. 5271-5283
Author(s):  
Disna P. Samarakoon ◽  
Nirmal Govindaraju ◽  
Raj N. Singh
Keyword(s):  
Dielectric Properties ◽  
Calcium Copper Titanate ◽  
Titanate Ceramics
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