SNL  Vol.3 No.4 , October 2013
Phase Transition Behavior of Nanocrystalline Al2O3 Powders
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.
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.

[1]   N. Bahlawane and T. Watanabe, “New Sol-Gel Route for the Preparation of Pure Alpha-Alumina at 950 Degrees C,” Journal of the American Ceramic Society, Vol. 83, No. 9, 2000, pp. 2324-2326.

[2]   L. A. Xue and I. W. Chen, “Influence of Additives on γ-to-α Transformation of Alumina,” Journal of Materials Science Letters, Vol. 11, No. 8, 1992, pp. 443-445.

[3]   K. Oberlander, “Applied Industrial Catalysis,” Academic Press, New York, 1984, p. 63.

[4]   K. Wefers, “Alumina Chemicals: Science and Technology Handbook,” The American Ceramic Society, Westerville, Ohio, 1990, p. 13.

[5]   H. Youn, J. W. Jang, I. Kim and K. S. J. Hong, “Low-Temperature Formation of α-Alumina by Doping of an Alumina-Sol,” Journal of Colloid and Interface Science, Vol. 211, No. 1, 1999, pp. 110-113.

[6]   H. Y. Zhu, J. D. Riches and J. C. Barry, “A-Alumina Nanofibers Prepared from Aluminum Hydrate with Poly-(ethylene oxide) Surfactant,” Chemistry of Materials, Vol. 14, No. 5, 2002, pp. 2086-2093.

[7]   S. Bhaduri, E. Zhou and S. B. Bhaduri, “Auto Ignition Processing of Nanocrystalline α-Al2O3,” Nanostructured Materials, Vol. 7, No. 5, 1996, pp. 487-496.

[8]   S. Bhaduri, S. B. Bhaduri and E. Zhou, “Auto Ignition Synthesis and Consolidation of Al2O3-ZrO2 Nano/Nano Composite Powders,” Journal of Materials Research, Vol. 13, No. 1, 1998, pp. 156-165.

[9]   K. C. Patil, S. T. Aruna and S. Ekambaram, “Combustion Synthesis,” Current Opinion in Solid State & Materials Science, Vol. 2, No. 2, 1997, pp. 158-165.

[10]   R. N. Das, A. Bandyopadhyay and S. Bose, “Nanocrystalline-Al2O3 Using Sucrose,” Journal of the American Ceramic Society, Vol. 84, No. 10, 2001, pp. 2421-2423.

[11]   A. G. Merzhanov, Z. A. Munir and J. B. Holt, “Combustion and Plasma Synthesis of High Temperature Materials,” VCH, New York, 1990, p. 1.

[12]   R. Garcia, G. A. Hirata and J. McKittrick, “New Combustion Synthesis Technique for the Production of (Inx-Ga1-x)2O3 Powders: Hydrazine/Metal Nitrate Method,” Journal of Materials Research, Vol. 16, No. 4, 2001, pp. 1059-1065.

[13]   J. McKittrick, E. J. Bosze, C. F. Bacalski and L. E. Shea, “Physical Properties of Combustion Synthesized Oxide Powders ed F D S Marquis,” Minerals, Metals and Materials Society, Warrendale, 1999, p. 139.

[14]   B. D. Cullity, “Elements of X-Ray Diffraction,” Addison-Wesley, Reading, 1967.

[15]   I. Levin and D. Brandon, “Metastable Alumina Polymorphs: Crystal Structures and Transition Sequences,” Journal of the American Ceramic Society, Vol. 81, No. 8, 1998, pp. 1995-2012.

[16]   S. Roy, A. Das Sharma, S. N. Roy and H. S. Maiti, “Synthesis of Yba2Cu3Oδ-8 Powder by Auto-Ignition of Cit- rate-Nitrate Gel,” Journal of Materials Research, Vol. 8, No. 11, 1993, pp. 2761-2766.

[17]   A. Chakrabort, P. S. Devi, S. Roy and H. S. Maiti, “Low-Temperature Synthesis of Ultrafine La0.84Sr0.16MnO3 Powder by an Autoignition Process,” Journal of Materials Research, Vol. 9, No. 4, 1994, pp. 986-991.