Investigation of surface defects in BaTiO3 nanopowders studied by XPS and positron annihilation lifetime spectroscopy
| Autor: | A. Olejniczak, A.V. Belushkin, P. Konieczny, Krzysztof Siemek, L.N. Korotkov |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Magnetism Annealing (metallurgy) General Physics and Astronomy Nanoparticle Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Positron annihilation spectroscopy Condensed Matter::Materials Science Grain growth X-ray photoelectron spectroscopy Chemical physics Multiferroics Spectroscopy |
| Zdroj: | Applied Surface Science. 578:151807 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2021.151807 |
| Popis: | Defect structures of BaTiO3 nanoparticles annealed in the air and their correlation with magnetic properties have been studied. As main research techniques, complementary methods such as XPS and positron annihilation lifetime spectroscopy were used. It was found that low-temperature annealing creates additional oxygen vacancies in nanoparticles both inside and on the nanoparticle surface, and high-temperature annealing favors the reduction of Ti. These changes influence nanoparticle magnetism and occur due to the charge compensation process and grain growth mechanism. Performed studies show that complementary XPS and positron annihilation spectroscopy are the effective tools to determine nanoparticle surface defect structure, which can be used to fabricate new rare room-temperature multiferroics materials. |
| Databáze: | OpenAIRE |
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