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Phase Transition Behavior of Nanocrystalline Al<sub>2</sub>O<sub>3</sub> Powders

¹ Department of Physics, University College of Engineering Arni (A Constituent College of Anna University Chennai), Arni, India;
² Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, India;
³ Department of Physics, Anna University Chennai, Chennai, India.

Soft Nanoscience Letters·Volume 03 (2013)·Pages 69–74·Published 11 October 2013·DOI10.4236/snl.2013.34012

Abstract

Alumina (Al 2 O 3 ) ha s 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 - Al 2 O 3 phase. The first phase γ - Al 2 O 3 was present ed 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 -Al 2 O 3 , showing high crystallinity. The particle sizes are closely related to γ - to α - Al 2 O 3 phase transition.

KeywordsNanocrystalline Al2O3Phase Transitionsγ-Al2O3α-Al2O3Differential Scanning Calorimetry (DSC)Electron Microscopy (TEM and SEM)

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Phase Transition Behavior of Nanocrystalline Al<sub>2</sub>O<sub>3</sub> Powders

Abstract

References (17)