2002/09/20 by A. P. Ramirez, G. Lawes, Ramirez, A. P. +8
Engineering · Materials Science · Physics and Astronomy · #Dielectric materials and actuators #Dielectric properties of ceramics #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0209498
9 pages, 2 figures
arxiv created 2002/09/20 · arxiv updated 2009/11/30
The dielectric constant of CaCu3Ti4O12 is measured with a different electrode geometry than previous measurements. Similar colossal values are obtained showing that they are "intrinsic" to the material. We show that in braced structures such as CaCu3Ti4O12, a small concentration O(10-3) of defects, which disrupt the bracing and relax between different equivalent configurations, can lead to colossal dielectric constants above a characteristic temperature. The dielectric constant e(w,T) has a frequency and temperature dependence of the same form as found experimentally.