Phase Transition Behavior of Nanocrystalline Al2O3 Powders - Soft Nanoscience Letters

SNL > Vol.3 No.4, October 2013

Phase Transition Behavior of Nanocrystalline Al₂O₃ Powders ()

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DOI: 10.4236/snl.2013.34012 6,618 Downloads 11,628 Views Citations

Author(s)

Balaraman Sathyaseelan, Iruson Baskaran, Kandasamy Sivakumar

Affiliation(s)

Department of Physics, Anna University Chennai, Chennai, India..
Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, India;.
Department of Physics, University College of Engineering Arni (A Constituent College of Anna University Chennai), Arni, India;.

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.

KEYWORDS

Nanocrystalline Al2O3; Phase Transitions; γ-Al2O3; α-Al2O3; Differential Scanning Calorimetry (DSC); Electron Microscopy (TEM and SEM)

Share and Cite:

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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