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Direct‐Current Field Dependence of Dielectric Properties in Alumina‐Doped Barium Strontium Titanate
Author(s) -
Wu Long,
Chen YihChien,
Huang ChengLiang,
Chou YiPing,
Tsai YuanTu
Publication year - 2000
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.1151-2916.2000.tb01455.x
Subject(s) - dielectric , materials science , doping , strontium titanate , dielectric loss , strontium , analytical chemistry (journal) , grain size , barium , mineralogy , titanate , composite material , ceramic , chemistry , metallurgy , optoelectronics , organic chemistry , chromatography
The dielectric properties of (Ba 0.6 Sr 0.4 )TiO 3 and Al 2 O 3 ‐doped (Ba 0.6 Sr 0.4 )TiO 3 have been characterized. The grain size of the specimen is maximum for (Ba 0.6 Sr 0.4 )TiO 3 that has been doped with 1 wt% Al 2 O 3 . The density and the real part of the relative dielectric constant each decrease as the Al 2 O 3 content increases. The loss factor is minimum for (Ba 0.6 Sr 0.4 )TiO 3 that has been doped with 2 wt% Al 2 O 3 . The dielectric constant of the specimens decreases as the applied dc field increases. The influence of the dc field on the loss factor is much less than that on the dielectric constant. The tunability is ∼24% for (Ba 0.6 Sr 0.4 )TiO 3 that has been doped with 1 wt% Al 2 O 3 .