Abstract
The structure and properties of Mn-doped 0.67BiFeO3-0.33BaTiO3 ceramics are systematically
investigated with respect to the effects of annealing prior to rapid cooling by quenching in air.
Air-quenching induces a change in crystal structure from pseudo-cubic to rhombohedral, with
higher quenching temperatures leading to an increased rhombohedral distortion. These
structural changes are correlated with the appearance of more well-defined ferroelectric domain configurations. It is shown that the surface preparation procedures for XRD measurements can induce significant changes in the peak profiles, indicating differences in crystal structure between the surface and bulk regions. Frequency dispersion in the temperature-dependent relative permittivity for the as-sintered sample is significantly reduced after quenching, accompanied by enhancement of the Curie point and improved temperature-stability of piezoelectric properties. It is proposed that the formation of defect clusters by A-site cation diffusion during cooling is circumvented by quenching, leading to the observed modification of structural distortion and ferroelectric properties.
Keywords
lead-free ceramics; ferroelectricity/ferroelectric materials; piezoelectric materials/properties;
quenching effects.
investigated with respect to the effects of annealing prior to rapid cooling by quenching in air.
Air-quenching induces a change in crystal structure from pseudo-cubic to rhombohedral, with
higher quenching temperatures leading to an increased rhombohedral distortion. These
structural changes are correlated with the appearance of more well-defined ferroelectric domain configurations. It is shown that the surface preparation procedures for XRD measurements can induce significant changes in the peak profiles, indicating differences in crystal structure between the surface and bulk regions. Frequency dispersion in the temperature-dependent relative permittivity for the as-sintered sample is significantly reduced after quenching, accompanied by enhancement of the Curie point and improved temperature-stability of piezoelectric properties. It is proposed that the formation of defect clusters by A-site cation diffusion during cooling is circumvented by quenching, leading to the observed modification of structural distortion and ferroelectric properties.
Keywords
lead-free ceramics; ferroelectricity/ferroelectric materials; piezoelectric materials/properties;
quenching effects.
| Original language | English |
|---|---|
| Journal | Journal of the American Ceramic Society |
| DOIs | |
| Publication status | Published - 18 Oct 2021 |