CaCu3Ti4O12/CaTiO3 composite dielectrics: Ba/Pb-free dielectric ceramics with high dielectric constants

Kobayashi, W.; Terasaki, I.
July 2005
Applied Physics Letters;7/18/2005, Vol. 87 Issue 3, p032902
Academic Journal
We have measured dielectric properties of Ca1+xCu3-xTi4O12 (x=0, 0.1, 0.5, 1, 1.5, 2, 2.9 and 3), and have found that Ca2Cu2Ti4O12 (a composite of CaCu3Ti4O12 and CaTiO3) exhibits a high dielectric constant of 1800 with a low dissipation factor of 0.02 below 100 kHz from 220 to 300 K. These are comparable to (or even better than) those of the Pb/Ba-based ceramics, which could be attributed to a barrier layer of CaTiO3 on the surface of the CaCu3Ti4O12 grains. The composite dielectric ceramics reported here are environmentally benign as they do not contain Ba/Pb.


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