Observation of giant dielectric constant in CdCu3Ti4O12 ceramics

Zuo, Rongqing; Feng, Linqing; Yan, Yongke; Chen, Bin; Cao, Guanghan

doi:10.1016/j.ssc.2006.02.002

Cited by 45 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6. This conclusion is consistent with a previous dielectric measurement of pure CdCu 3 Ti 4 O 12 (ε ～9 × 10 3 at room temperature (100 kHz)) by Zuo et al [28], in contrast to the first report, ε=409, for pure CdCu 3 O-Cu-O. [29,30] In typical perovskite ferroelectrics, the dipole moment induced by the distortion of TiO 6 octahedron from its regular configuration plays an important role for the appearance of ferroelectricity.…”

Section: Introductionsupporting

confidence: 92%

Effect of Cd Dopant on Dielectric Properties of CaCu3Ti4O12

Onodera

Takeuchi

Hiramatsu

2010

Trans. Mat. Res. Soc. Japan

View full text Add to dashboard Cite

, 0.01, 0.03, 0.05 and 0.1 was studied in the frequency range of 10 kHz-1 MHz over the temperature range of 300-850 K. It is found that the chemical substitution of Cd ions at the Ca sites results in decrease in dielectric constant by 9% -55% for Cd-doped CaCu 3 Ti 4 O 12 , at room temperature. Although the decrease in the dielectric constant was observed by Cd doping, no drastic suppression of dielectric response could be observed by Cd-doping. The dielectric anomaly was found at T 1 (727 K for x=0.05), which suggests a phase transition. This T 1 decreases linearly with increasing x. CdCu 3 Ti 4 O 12 is still a member of high-dielectric materials.

show abstract

Section: Introductionsupporting

confidence: 92%

Effect of Cd Dopant on Dielectric Properties of CaCu3Ti4O12

Onodera

Takeuchi

Hiramatsu

2010

Trans. Mat. Res. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…Conversely, the complete ion-substitution compounds ACu 3 Ti 4 O 12 (A = Cd, Sr, La 2/3 , Y 2/3 , Bi 2/3 , Na 1/2 Bi 1/2 etc.) all exhibit the same giant dielectric constant and perovskite-like crystal structure as CaCu 3 Ti 4 O 12 with space group Im 3 [25][26][27][28][29][30]. However, Subramanian et al [1] pointed out in 2000 that the dielectric constant of CaCu 3 Ti 4 O 12 measured at 100 kHz and room temperature was more than five times larger than other kinds of ACu 3 Ti 4 O 12 compounds.…”

Section: Introductionmentioning

confidence: 99%

Giant dielectric response in Dy2/3Cu3Ti4O12 ceramics

Liu

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Dy 2/3 Cu 3 Ti 4 O 12 ceramics were successfully synthesized by solid-state reaction process, and the crystal structure, microstructure and dielectric properties were systematically investigated. It has been found that Dy 2/3 Cu 3 Ti 4 O 12 ceramics exhibit giant dielectric constants (e 0 * 10 4 at 1 kHz and room temperature) and have two thermal-activated dielectric relaxations at low and high temperatures, which are quite similar to those reported in CaCu 3 Ti 4 O 12 ceramics. The low-temperature dielectric relaxation with the activation energy of 0.092 eV is supposed to be the intrinsic response originated from the defect structures of oxygen vacancy and aliovalences of Ti and Cu ions, which might make the grains semiconductive. Moreover, the heterogeneous structures especially the grain boundaries should be responsible for the high-temperature dielectric relaxation with the activation energy of 0.585 eV. The semiconducting grains and insulating grain boundaries thus play the key role as extrinsic origin for the giant dielectric response in Dy 2/3 Cu 3 Ti 4 O 12 ceramics according to the internal barrier layer capacitor (IBLC) mechanism.

show abstract

“…It is believed that insulating surfaces are formed on semi-conducting grains during the sintering process. These insulating layers are very sensitive to sintering parameters, like temperature, heating rate, duration of heat-treatment and atmosphere [6][7][8][9]. Many studies [7,10] report the influence of sintering time and temperature on the microstructure of CCTO, namely the increase of average grain size and Cu rich segregation at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%