Estudos da sinterização de Bi12TiO20 (BTO) visando obter cerâmicas transparentes
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Data
2011-02-16
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Universidade Federal de Goiás
Resumo
This work presents the systematic results of studies concerning the sintering
of the Bi12TiO20 (BTO) aiming the production of transparent ceramic samples. All that
because the BTO is a material that has great scientific and technologic visibility due
to its optical, electro and electro-optical properties, but still little explored as ceramic.
The sintering starting material was obtained by solid state reaction between
Bi2O3 e TiO2; the synthesized BTO was grinded in ball milling until sub micrometric
sizes. The conditions for preparing green samples were also investigated, allowing
samples with green relative density between 58% and 62%, with uniaxial and
isostatic pressing techniques. The study of the sintering process involved different
sintering programs, under different atmospheres conditions and additive utilization.
Optimized conditions were established and the limiting factors discussed.
The quality of the obtained ceramics was assessed by their final relative
density, phase homogeneity, microstructure and optical properties (transmission,
optical activity and electro-optical performance). Samples with relative density above
99,9% and 50% of the monocrystal´s optical transmission in the 633 nm wavelength
and equal optical activity were obtained. Nevertheless, the ceramics still show
scattering centers and none liquid electro-optical effect was observed.
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Citação
AMARAL, Thiago Martins. Studies of sintering Bi12TiO20 (BTO) in order
obtain transparent ceramics. 2011. 83 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de Goiás, Goiânia, 2011.