10 research outputs found
Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO3-xSrTiO3 ceramics
While BiFeO3-based solid solutions show great promise for applications in
energy conversion and storage, realizing this promise necessitates
understanding the structure-property relationship in particular pertaining to
the relaxor-like characteristics often exhibited by solid solutions with
polar-to-non-polar morphotropic phase boundaries. To this end, we investigated
the role of the compositionally-driven relaxor state in (100-x)BiFeO3-xSrTiO3
[BFO-xSTO], via in situ synchrotron X-ray diffraction under bipolar
electric-field cycling. The electric-field induced changes to the crystal
structure, phase fraction and domain textures were monitored via the {111}pc,
{200}pc, and 1/2{311}pc Bragg peaks. The dynamics of the intensities and
positions of the (111) and (11-1) reflections reveal an initial non-ergodic
regime followed by long-range ferroelectric ordering after extended poling
cycles. The increased degree of random multi-site occupation in BFO-42STO
compared to BFO-35STO is correlated with an increase of the critical electric
field needed to induce the non-ergodic-to-ferroelectric transition, and a
decrease in the degree of domain reorientation. Although both compositions show
an irreversible transition to a long-range ferroelectric state, our results
suggest that the weaker ferroelectric response in BFO-42STO is related to an
increase in ergodicity. This, in turn, serves to guide the development of
BFO-based systems into promising platform for further property engineering
towards specific capacitor applications
Angle resolved characterization of nanostructured and conventionally textured silicon solar cells
The interplay between domains, defects and electric field induced phase transformations in bulk ferroelectrics
Dynamics and grain orientation dependence of the electric field induced phase transformation in Sm modified BiFeO<sub>3</sub> ceramics
Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO<sub>3</sub>–<i>x</i>SrTiO<sub>3</sub> ceramics
While BiFeO3-based solid solutions show great promise for applications in energy conversion and storage, realizing this promise necessitates understanding the structure–property relationship in particular pertaining to the relaxor-like characteristics often exhibited by solid solutions with polar-to-non-polar morphotropic phase boundaries. To this end, we investigated the role of the compositionally-driven relaxor state in (100 − x)BiFeO3–xSrTiO3 [BFO–xSTO], via in situ synchrotron X-ray diffraction under bipolar electric-field cycling. The electric-field induced changes to the crystal structure, phase fraction and domain textures were monitored via the {111}pc, {200}pc, and 1/2{311}pc Bragg peaks. The dynamics of the intensities and positions of the (111) and (11̄) reflections reveal an initial non-ergodic regime followed by long-range ferroelectric ordering after extended poling cycles. The increased degree of random multi-site occupation in BFO–42STO compared to BFO–35STO is correlated with an increase of the critical electric field needed to induce the non-ergodic-to-ferroelectric transition, and a decrease in the degree of domain reorientation. Although both compositions show an irreversible transition to a long-range ferroelectric state, our results suggest that the weaker ferroelectric response in BFO–42STO is related to an increase in ergodicity. This, in turn, serves to guide the development of BFO-based systems into promising platform for further property engineering towards specific capacitor applications