Abstract
The CoFe2O4(CFO)/Bi3.15Nd0.85Ti3O12(BNdT) composite ceramics with coherent-lattice interfaces were prepared to keep good ferroelectricity. The coherent-lattice interfaces exhibit (020)BNdT//(130)CFO orientation, as a result of a very small lattice mismatch. Raman spectra indicate symmetry breaking of CFO phase with the forbidden A1g mode (~684cm−1) leading to new modes around 727 and 734cm−1, suggesting that coherent interfaces have superlattice-like characteristics. The electric breakdown field increases to 400kV/cm for the 30mol% CFO ceramic comparing with 250kV/cm for the pure BNdT. Partly enhanced ferroelectric polarization, as measured by hysteresis loops, is observed likely helped by this superlattice-like bonding.
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