| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
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| Presentation Title |
Influence of Powder Annealing on Spontaneous Polarization and Recombination Centers in BaTiO3 Nanocrystals |
| Author(s) |
Oliver Diwald, Ellie Neige, Thomas Schwab, Maurizio Musso, Thomas Berger, Gilles Bourret |
| On-Site Speaker (Planned) |
Oliver Diwald |
| Abstract Scope |
Control over point defects is indispensable for tuning the properties of functional nanoparticle systems, where trapping and release of photogenerated charges determine basic operation.[1] We studied the contribution of i) tetragonal distortion, responsible for spontaneous polarization, and ii) point defects on charge separation within BaTiO3 (BTO) nanocrystals.[2] Electron paramagnetic resonance and O2 photoadsorption experiments show for the first time the beneficial effect of the BTO tetragonal nanocrystal lattice on charge separation. Charge separation is hindered within BTO nanoparticles annealed ≥ 600 °C, due to Ba–O divacancies that act as recombination centers.[3] The opposing interplay between tetragonal distortion and annealing-induced defect formation inside the lattice highlights the importance of defect engineering within perovskite nanoparticles.
[1] T. Berger, O. Diwald O, Defects at Oxide Surfaces, 2015, 58 ISBN : 978-3-319-14366-8. [2] E. Neige et al. Small 2023, 2206805. [3] E. Neige, O. Diwald, Phys. Chem. Chem. Phys. 2021, 23, 12881. |