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Comparison of sol-gel and co-precipitation methods on the structural properties and phase transformation of  γ and α-Al2O3 nanoparticles

A. Rajaeiyan • M. M. Bagheri-Mohagheghi   

  1. School of Physics, Damghan University, Damghan, Iran
  • Received:2012-12-21 Revised:2013-03-05 Online:2013-06-25 Published:2013-03-29
  • Contact: e-mail: m_mohagheghee@yahoo.co.uk
  • About author:e-mail: m_mohagheghee@yahoo.co.uk

Abstract: The nanostructured c and a alumina powders were synthesized by sol-gel and co-precipitation methods,and properties of the powders were studied by XRD, SEM,TEM, BET and FTIR. The results showed that both c and a phases were formed in the lower temperature in precipitation method compared to sol-gel. The size of spherical aalumina synthesized by sol-gel was 10–15 nm, whereas the sample prepared by co-precipitation yielded nearly spherical and hexagon a-powder with particle size of 10–50 nm.At 750 ℃ the resulting powder prepared by co-precipitation  exhibited larger surface area (206.2 m2/g) compared to sol-gel (30.72 m2/g), hence it is recommended for catalytic and sensing applications.

Key words:  &gamma, and α-Al2O3 , Co-precipitation,  , Sol-gel , Nanoparticles