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Sintered compacts of nano and micron-sized BaTiO3: Dramatic influence on the microstructure and dielectric properties

Published online by Cambridge University Press:  01 April 2006

Vishnu Shanker ,
Tokeer Ahmad ,
Henry Ip  and
Ashok K. Ganguli
Vishnu Shanker
Affiliation:
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
Tokeer Ahmad
Affiliation:
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
Henry Ip
Affiliation:
Department of Chemistry and Biochemistry, Center for Materials Research and Education, Rowan University, Glassboro, New Jersey 08028
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: [email protected]
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Abstract

Sintered compacts of nano-sized and micron-sized BaTiO3 show sharp ferroelectric transition and high dielectric constant at specific compositions. The sintered compacts with 1 wt% nano-BaTiO3 show a maximum dielectric constant of 1680. At the transition temperature (Tc) there are two maxima at 0.5 and 2 wt%. The variation in the dielectric constant at Tc is also reflected in the behavior of the ferroelectric transition as studied by differential scanning calorimetry. This interesting oscillatory variation of the dielectric constant and dielectric loss with increase in the amount of nanoparticles in the sintered compacts is observed for the first time. The variation of the dielectric properties and the ferroelectric transition of the sintered compacts could be related to subtle changes in the microstructure.

Keywords

Dielectric propertiesFerroelectricityMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 4 , April 2006 , pp. 816 - 822
Copyright
Copyright © Materials Research Society 2006

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