Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12 -: art. no. 092106

被引：167
作者：
Homes, CC [1 ]
Vogt, T
Shapiro, SM
Wakimoto, S
Subramanian, MA
Ramirez, AP
机构：
[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[2] DuPont Co Inc, Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA
[3] MIT, Dept Phys, Cambridge, MA 02139 USA
[4] Los Alamos Natl Lab, Mat Integrat Sci Lab, Los Alamos, NM 87545 USA
来源：
PHYSICAL REVIEW B | 2003年 / 67卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.67.092106
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The cubic perovskite-related ceramic CaCu3Ti4O12 has a very high static dielectric constant epsilon(0)greater than or similar to10 000 at room temperature (RT), which drops to about 100 below similar or equal to100 K. Substituting Cd for Ca reduces the RT value of epsilon(0) by over an order of magnitude. The origin of the large epsilon(0) is not fully understood, but may be due to an internal barrier layer capacitance (IBLC) effect. Infrared measurements on the Ca and Cd compounds show that low-frequency modes increase dramatically in strength at low temperature, suggesting a change in the effective charges and increasing electronic localization that may lead to a breakdown of the IBLC effect.
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