Microstructure, phase formations and optical bands in nanostructured alumina

Microstructure, phase formations and optical bands in nanostructured alumina

Jitendra Gangwar1,2, Kajal Kumar Dey1, Komal1, Praveen1, Surya Kant Tripathi2, Avanish Kumar Srivastava1*

1National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S. Krishnan Road, New Delhi 110012, India

2Department of Physics, Panjab University, Chandigarh 160014, India

Adv. Mater. Lett., 2011, 2 (6), pp 402-408

DOI: 10.5185/amlett.2011.3233

Publication Date (Web): Apr 08, 2012

E-mail: aks@nplindia.ernet.in, avanish.aks555@gmail.com

Abstract


We report the synthesis of nano-scaled alumina of varied dimensions through a novel optimized processing of aluminum nitrate. The X-ray diffractometry confirmed the formation of X- and γ- phases of alumina particles in the nano region, depending on the annealing conditions during processing. Subsequently, a detailed microscopic investigation revealed the morphological alterations and crystallographic information even at lattice scale. The presence of different bonds and band energies were investigated by employing infra-red and photoluminescence spectrometry, respectively. The evolution of fascinating microstructure, phase formations and optical bands has been presented and discussed to elucidate the systematic evolution of different crystalline phases (α and γ) from an amorphous alumina with increased annealing temperature.

Keywords

Alumina, high resolution electron microscopy, ?- and &gamma,- phases, optical bands

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