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Microstructure and Electrical Properties of Chemically Prepared Nb 2 O 5 ‐Doped SrTiO 3 Ceramics
Author(s) -
Raymond Mark V.,
Amarakoon Vasantha R.W.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05196.x
Subject(s) - microstructure , materials science , calcination , dielectric , doping , ceramic , mineralogy , chemical engineering , analytical chemistry (journal) , composite material , chemistry , optoelectronics , chromatography , engineering , catalysis , biochemistry
Chemically homogeneous SrTiO 3 powders of submicrometer size were obtained by alcohol dehydration and subsequent calcination of citrate/format solutions. Nb 2 O 5 ‐doped SrTiO 3 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 SrTiO 3 . No semiconducting behavior was observed for donor‐doped TiO 2 ‐excess SrTiO 3 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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