Abstract
We studied temperature and frequency dependences of dielectric properties of (1-x)Ca(Fe1/2Nb1/2)O3-xTiO2 (CFNT) composite ceramics in the ranges of 90–700 K and 102~106 Hz, respectively. Then we detected relaxation in the permittivity formalism. Most interestingly, a large and temperature-independent permittivity of 105 could be obtained in the hetero-phase compound with x = 0.5 by interface engineering. The results were interpreted in terms of Maxwell-Wagner relaxation, which accounts for the fact that the grains and grain boundaries have very different conductivity.
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