Publications by authors named "Betul Akkopru-Akgun"
Proximity ferroelectricity is an interface-associated phenomenon in electric-field-driven polarization reversal in a non-ferroelectric polar material induced by one or more adjacent ferroelectric materials. Here we report proximity ferroelectricity in wurtzite ferroelectric heterostructures. In the present case, the non-ferroelectric layers are AlN and ZnO, whereas the ferroelectric layers are AlBN, AlScN and ZnMgO.
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- Strong coupling between polarization and strain in ferroelectric complex oxides allows for significant tuning of their properties, particularly demonstrated in KNbO thin films.
- Applying biaxial strain can drastically increase the Curie temperature, with predictions indicating it could exceed 1325 K under certain conditions.
- Enhanced properties such as a 46% increase in remanent polarization and a 200% boost in optical second harmonic generation coefficients make lead-free KNbO a promising candidate for high-temperature ferroelectric memory and quantum computing applications.
Lead zirconate titanate (PZT) films with high Nb concentrations (6-13 mol%) were grown by chemical solution deposition. In concentrations up to 8 mol% Nb, the films self-compensate the stoichiometry; single phase films were grown from precursor solutions with 10 mol% PbO excess. Higher Nb concentrations induced multi-phase films unless the amount of excess PbO in the precursor solution was reduced.
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