Abstract

The microstructure of chemical inhomogeneity having the core-shell structured grain of cerium-modified barium titanate was investigated using X-ray, TEM, dilatometer and DSC methods. Specific heat anomalies, thermal expansion anomalies and lattice parameter discontinuities were associated with the three ferroelectric transitions ( T c , T 1, and T 2) of the grain-core of BaTiO 3. The crystal symmetry of the chemically inhomogeneous grain was strongly dependent on the cerium concentration and temperature. In comparison to other physical quantities, the temperature dependence of the dielectric constant was easily influenced by stress.

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