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RESEARCH PRODUCT

In situ study of the phase transition in Bi2Ti4O11

H. BöhmS. AmelinckxVolker KahlenbergG. Van TendelooLeona C. Nistor

subject

Phase transitionChemistrySuperlatticeCondensed Matter PhysicsMolecular physicsElectronic Optical and Magnetic MaterialsIonInorganic ChemistryCondensed Matter::Materials ScienceCrystallographyDomain wall (magnetism)Electron diffractionPhase (matter)Materials ChemistryCeramics and CompositesAntiferroelectricityPhysical and Theoretical ChemistryLone pair

description

Abstract The paraelectric ⇌ antiferroelectric phase transition of the compound Bi 2 Ti 4 O 11 is studied in situ by electron diffraction and electron microscopy. The transition is reversible and clearly second order. Above T c faint streaking at the superlattice positions persists. In the low-temperature phase, antiphase boundaries with a displacement vector R = 1/2[101] are revealed; they show a finite width, suggesting a gradual displacement of the Bi atoms at the transition. A model for the domain wall configuration is proposed, based on the influence of the lone pairs of Bi 3+ ions at the transition.

yearjournalcountryeditionlanguage
1995-11-01Journal of Solid State Chemistry
https://doi.org/10.1016/0022-4596(95)80042-n