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- Title
{111} Twin Formation and Abnormal Grain Growth in Barium Strontium Titanate.
- Authors
Byoung-Ki Lee; Yang-Il Jung; Kang, Suk-Joong L.; Nowotny, Janusz
- Abstract
Two series of experiments were performed to study the experimental conditions for the formation of {111} twins and related microstructures in barium strontium titanate ((Ba,Sr)TiO[sub 3]). In the first series, the phase equilibria in the BaTiO[sub 3]SrTiO[sub 3]-TiO[sub 2] system were determined. XRD and WDS analysis, done in the BaTiO[sub 3]-rich region, of 45(Ba,Sr)TiO[sub 3]-10TiO[sub 2] samples annealed at 1250°C for 200 h in air showed that (Ba,Sr)TiO[sub 3] was in equilibrium with Ba[sub 6]Ti[sub 17[O[sub 40] (B[sub 6]T[sub 17]) and Ba[sub 4]Ti[sub 13]O[sub 30] phases with strontium solubility (Sr/(Ba + Sr)) of ∼0.02 and 0.20, respectively. In the second series the microstructures of samples consisting of a mixture of (Ba,Sr)TiO[sub 3] and 2.0 mol% TiO[sub 2], were observed after sintering at 1250°C for 100 h in air. {111} twins formed only in the samples with faceted B[sub 6]T[sub 17] second phase particles, similar to the ease of BaTiO[sub 3]. In these samples, abnormal grain growth occurred in the presence of the {111} twins. In contrast, no {111} twins formed and no abnormal grain growth occurred in the samples containing second phase particles other than B[sub 6]T[sub 17]. With an increased substitution of strontium for barium, the aspect ratio of abnormal grains containing {111} twin lamellae was reduced. This result was attributed to a reduction in the relative stability of the {111} planes with the strontium substitution.
- Subjects
MICROSTRUCTURE; METAL crystal growth; CRYSTALLIZATION
- Publication
Journal of the American Ceramic Society, 2003, Vol 86, Issue 1, p155
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1151-2916.2003.tb03294.x