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Phase Transition Behavior of Nanocrystalline Al2O3 Powders

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DOI: 10.4236/snl.2013.34012    4,902 Downloads   8,510 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.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

B. Sathyaseelan, I. Baskaran and K. Sivakumar, "Phase Transition Behavior of Nanocrystalline Al2O3 Powders," Soft Nanoscience Letters, Vol. 3 No. 4, 2013, pp. 69-74. doi: 10.4236/snl.2013.34012.

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