Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2753

Full Length Research Paper

Preparation of nanocrystalline strontium titanate (SrTiO3) powder by sol-gel combustion method

Thanawat Klaytae
  • Thanawat Klaytae
  • Department of Physics, Faculty of Science, Naresuan University, Phitsanuloke 65000, Thailand.
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Piram Panthong
  • Piram Panthong
  • Department of Physics, Faculty of Science, Naresuan University, Phitsanuloke 65000, Thailand.
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Sarawut Thountom
  • Sarawut Thountom
  • Research Center for Academic Excellence in Petroleum, Petrochemical andAdvanced Material, Faculty of Science, Naresuan University, Phitsanuloke, 65000, Thailand.
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  •  Accepted: 26 October 2012
  •  Published: 31 January 2013

Abstract

Nanocrystalline strontium titanate (SrTiO3, ST) powders were prepared by sol-gel combustion method. The influence of fuel content ratio (ratio of citric acid (CA) and total metal nitrate (MN); Ra = CA:MN) and calcination temperature were investigated on the structure, morphology, and crystallite size by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the Ra ratio of 3:1 is adequate for a good crystallization of pure perovskite phase after calcination by combining the washing process with nanometric crystallite size and porous microstructure. For the SrTiO3 powder synthesized with Ra ratio = 3:1, the effect of calcination temperature was investigated, showing that the perovskite structure is optimum crystallized at 500°C, without secondary phase formation. The particle sizes increased with increasing Ra ratio and calcination temperature.

 

Key words: Sol-gel combustion method, strontium titanate and fuel content ratio, nanocrystalline powders.