Structural Characteristics & Dielectric Properties of Tantalum Oxide Doped Barium Titanate Based Materials

Rubayyat Mahbub, Md. Sazzad Hossain, Md. Fakhrul Islam

Abstract


In this research, the causal relationship between the dielectric properties and the structural characteristics of 0.5 & 1.0 mol% Ta2O5 doped BaTiO3 based ceramic materials were investigated under different sintering conditions. Dielectric properties and microstructure of BaTio3 ceramics were significantly influenced by the addition of a small amount of Ta2O5. Dielectric properties were investigated by measuring the dielectric constant (k) as a function of temperature and frequency. Percent theoretical density (%TD) above 90% was achieved for 0.5 and 1.0 mol% Ta2O5 doped BaTiO3. It was observed that the grain size decreased markedly above a doping concentration of 0·5 mol% Ta2O5. Although fine grain size down to 200-300nm was attained, grain sizes in the range of 1-1.8µm showed the most alluring properties. The fine-grain quality and high density of the Ta2O5 doped BaTiO3 ceramic resulted in tenfold increase of dielectric constant. Stable value of dielectric constant as high as 13000-14000 was found in the temperature range of  55 to 80°C, for 1.0 mol% Ta2O5 doped samples with corresponding shift of Curie point to ~82°C. Experiments divulged that incorporation of a proper content of Ta2O5 in BaTiO3 could control the grain growth, shift the Curie temperature and hence significantly improve the dielectric property of the BaTiO3 ceramics.


Keywords


Barium Titanate, Tantalum Oxide Doping, Microstructure, Frequency, Dielectric Constant.

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Copyright (c) 2013 Rubayyat Mahbub, Md. Sazzad Hossain, Md. Fakhrul Islam

License URL: http://creativecommons.org/licenses/by-nc-nd/3.0/

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