Role of the dispersion route on the phase transformation of a nano-crystalline transition alumina View Full Text


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Article Info

DATE

2009-07

AUTHORS

Paola Palmero, Barbara Bonelli, Fernando Lomello, Edoardo Garrone, Laura Montanaro

ABSTRACT

De-agglomeration of a nanocrystalline transition alumina powder was performed in distilled water at its natural pH under magnetic stirring for 170 h or by ball milling for 3 h. Gibbsite appeared near transition aluminas in the magnetic stirred sample. In addition, a relevant lowering of the α-Al2O3 crystallization temperature was observed in the dispersed materials with respect to the as-received powder. However, the activation energy of the above transformation, determined by the Kissinger method, was in any case about 480–500 kJ/mol and unaffected by the dispersion route. On the contrary, it was reduced of about 10% in α-alumina seeded samples, obtained by flash plunging the powders at 1,290 °C for 10 min. More... »

PAGES

223-229

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10973-009-0260-8

DOI

http://dx.doi.org/10.1007/s10973-009-0260-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033306749


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