Microstructure and Electrical Properties of Chemically Prepared Nb2O5-Doped SrTiO3 Ceramics |
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| Authors: | Mark V. Raymond Vasantha R.W. Amarakoon |
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| Affiliation: | New York State College of Ceramics at Alfred University, Alfred, New York 14802 |
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| Abstract: | Chemically homogeneous SrTiO3 powders of submicrometer size were obtained by alcohol dehydration and subsequent calcination of citrate/format solutions. Nb2O5-doped SrTiO3 was prepared with various Sr:Ti ratios resulting in an anomalous increase in the dielectric constant ( K 'up to ∼8000) for donor-doped SrO-excess SrTiO3. No semiconducting behavior was observed for donor-doped TiO2-excess SrTiO3 when fired in air. Therefore, a "brick-wall" type of microstructure was formed as a result of the excess SrO, giving rise to anomalously high dielectric constants. |
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| Keywords: | titanates strontium nitrates microstructure electrical properties |
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