| Autor: |
Monin, A., Zemtsova, E., Shveikina, N., Smirnov, V. |
| Zdroj: |
Nanotechnologies in Russia; Apr2012, Vol. 7 Issue 3/4, p152-155, 4p |
| Abstrakt: |
Micro- and nanopowders of aluminum oxide with nanoparticles ranging from 200 μm to 40 nm obtained by the sol-gel technique have been investigated and the influence of their dimensions on phase transitions γ-AlO → α-AlO have been studied using differential thermal analysis, X-ray diffraction, and scanning electron microscopy. The data of X-ray-phase analysis show that the phase transition from γ-AlO to θ-AlO is typical for aluminum oxide nanoparticles at 900°C, while phase transitions from γ-AlO to θ-AlO are practically not observed at 900°C for microsized aluminum oxide. The transition to the form α-AlO proceeds in the temperature range from 1150 to 1200°C. Generally, the results indicate that a reduction in particle sizes allows us to stabilize the formation of α-AlO at lower temperatures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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