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Nanostructured Barium Titanate Prepared Through a Modified Reverse Micellar Route: Structural Distortion and Dielectric Properties

Published online by Cambridge University Press:  01 June 2005

Tokeer Ahmad ,
Gnanasundaram Kavitha ,
Chandrabhas Narayana  and
Ashok K. Ganguli
Tokeer Ahmad
Affiliation:
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
Gnanasundaram Kavitha
Affiliation:
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
Chandrabhas Narayana
Affiliation:
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
Ashok K. Ganguli*
Affiliation:
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
*
a) Address all correspondence to this author.e-mail: ashok@chemistry.iitd.ernet.in
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Abstract

A modified and convenient route using microemulsions (avoiding Ba-alkoxide) was evolved for the synthesis of uniform and monodisperse nanoparticles of BaTiO3 at low temperature (800 °C). X-ray line broadening and transmission electron microscopy studies show that the particle size varies in the range of 20–25 nm. Evidence for tetragonal distortion was found in these nano-sized (20–25 nm) particles of barium titanate from careful x-ray diffraction studies as well as from Raman spectroscopy. Our study showed that the critical size of the cubic to tetragonal transition in barium titanate may be much lower than suggested theoretically. The grain size showed an increase on sintering of 35 nm at 900 °C to 120 nm at 1100 °C, which was much lower than the grain size obtained at this temperature by the normal solid state route. The dielectric constant depends on sintering temperature and was found to increase from 210 (900 °C sintering) to 520 (1100 °C sintering) at 100 kHz. The dielectric constant was highly stable with temperature as well as frequency.

Keywords

NanoparticleTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1415 - 1421
Copyright
Copyright © Materials Research Society 2005

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