The series of 0.86BaTiO 3 -(0.14Àx)BaZrO 3 -xCaTiO 3 (abbreviated as BT-BZ-xCT) ceramics with 0.03 ≤ x ≤ 0.11 were studied to obtain high piezoelectric properties. Rietveld refinement analysis indicated that the BT-BZ-CT compositions follow a gradual rhombohedral (R) ? orthorhombic (O) + R ? O + tetragonal (T) ? T phase transformation with increasing x. Clear evidence of the series of ferroelectric phase transitions was also found in the dielectric results. The R-Oand O-T transition temperature shifted close to ambient temperature, while the Curie temperature slightly increased with increasing x. In addition to the dielectric loss peaks associated with the structural phase transitions, a broad low-temperature dielectric loss peak was detected in the R phase at T = 90-150 K. This dielectric relaxation was attributed to the domain wall freezing and fits well to the Vogel-Fulcher model with activation energy E a % 60-300 meV and freezing temperature T VF % 75-140 K. High piezoelectric strain coefficient (d 33 *) of about 1030 pm/V at 10 kV was achieved at x = 0.07, and a high Curie temperature (T C ) was maintained at about 375 K.How to cite this article: Sutapun M, Charoonsuk T, Kolodiazhnyi T, Vittayakorn N. CaTiO 3 induced ferroelectric phase coexistence and low temperature dielectric relaxation in BaTiO 3 -BaZrO 3 ceramics.
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