Soft Nanoscience Letters

Volume 3, Issue 4 (October 2013)

ISSN Print: 2160-0600   ISSN Online: 2160-0740

Google-based Impact Factor: 1  Citations  

Phase Transition Behavior of Nanocrystalline Al2O3 Powders

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DOI: 10.4236/snl.2013.34012    6,640 Downloads   11,124 Views  Citations

ABSTRACT

Alumina (Al2O3) has been synthesized through combustion synthesis (CS) technique. The calcined products were characterized using X-ray diffractional analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermo-gravimetric analysis (TGA). TG-DTA results reveal the various stages involved in transition from γ-phase to α-Al2O3 phase. The first phase γ-Al2O3 was presented in the temperature range from 600°C-875°C as deduced from the XRD patterns with cubic crystal structure. The second stage occurs in the temperature range from 900°C-1000°C. In the final step, above 1000°C, the aluminium oxide appears completely as α-Al2O3, showing high crystallinity. The particle sizes are closely related to γ- to α-Al2O3 phase transition.

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Sathyaseelan, B. , Baskaran, I. and Sivakumar, K. (2013) Phase Transition Behavior of Nanocrystalline Al2O3 Powders. Soft Nanoscience Letters, 3, 69-74. doi: 10.4236/snl.2013.34012.

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