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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 6
BKCSDE 30(6)
June 20, 2009 

Microstructural Characterization and Dielectric Properties of Barium Titanate Solid Solutions with Donor Dopants
Yeon Jung Kim*, June Won Hyun, Hee Soo Kim, Joo Ho Lee, Mi Young Yun, S J Noh, Yong Hyun Ahn
BaTiO3, Donor dopants, Dielectric properties, Curie-Weiss law
The correlation between the sintering temperature and dielectric properties in the Nb5+ and Ta5+ doped BaTiO3 solid solutions have been investigated. The samples were sintered at temperatures ranging from 1250 to 1350 oC for 4 h in air. SEM, XRD and SEM/EDS techniques were used to examine the structure of the samples with particular focus on the incorporation of Nb5+ and Ta5+ ions into the BaTiO3 crystal lattice. The X-ray diffraction peaks of (111), (200) and (002) planes of BaTiO3 solid solution doped with different fractions of Nb5+ and Ta5+ were investigated. The dielectric properties were analyzed and the relationship between the properties and structure of doped BaTiO3 was established. The fine-grain and high density of the doped BaTiO3 ceramics resulted in excellent dielectric properties. The dielectric properties of this solid solutions were improved by adding a small amount of dopants. The transition temperature of the 1.0 mole% Ta5+ doped BaTiO3 solid solution was ∼110 oC with a dielectric constant of 3000 at room temperature. At temperatures above the Curie temperatures, the dielectric constant followed the Curie-Weiss law.
1267 - 1273
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