English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Fast-cooling after sintering or annealing of BiFeO3-BaTiO3 mixed oxideceramics yields core-shell structures that give excellent functionalproperties, but their precise phase assemblage and nanostructure remains anopen question. By comparing conventional electron energy loss spectroscopy(EELS) with scanning precession electron diffraction (SPED) mapping using adirect electron detector, we correlate chemical composition with the presenceor absence of octahedral tilting and with changes in lattice parameters. Thisreveals that some grains have a 3-phase assemblage of a BaTiO3-rich pseudocubicshell; a BiFeO3-rich outer core with octahedral tilting consistent with an R3cstructure; and an inner core richer in Ba and even poorer in Ti, which seems toshow a pseudocubic structure of slightly smaller lattice parameter than theshell region. This last structure has not been previously identified in thesematerials, but the composition and structure fit with previous studies. Theseinner cores are likely to be non-polar and play no part in the ferroelectricproperties. Nevertheless, the combination of EELS and SPED clearly provides anovel way to examine heterogeneous microstructures with high spatialresolution, thus revealing the presence of phases that may be too subtle todetect with more conventional techniques.

Correlative chemical and structural nanocharacterization of a pseudo-binary 0.75Bi(Fe0.97Ti0.03)O3-0.25BaTiO3 ceramic