Synthesis, crystal growth and characterization of γ-Phase bismuth titanium oxide with gallium
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2000
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Gallium solubility in the Bi12TiO20 (BTO) matrix was investigated by solid state reaction
synthesis and Bi12Ti(1-x)GaxO20 (BTGaO) single crystals were grown by Top Seeded Solution
Growth (TSSG). We determined that it is possible to obtain a continuous solid solution from
(x)Bi12TiO20:(1-x)Bi12[Ga0.7Bi0.3]O20andthatGareplacesTiintheBTOmatrixgivingBi12Ti(1-x)Ga(x)O20
up to x < 0.2. BTGaO single crystals grown with an excess of Bi2O3 were transparent, a bleaching
effect was observed due to the presence of gallium in the crystalline sillenite structure and their
lattice parameter was higher than for pure BTO. The results for BTGaO single crystals showed an
increase in the optical activity from ρ0 = 6.4° ± 0.3°/mm, for BTO, to ρ0 = 9.7° ± 0.3°/mm, for
BTGaO grown with x = 0.30 in the melt. The BTGaO crystal presented an activation energy value
of 0.48 ± 0.02 eV for 100 °C ≤ T ≤ 300 °C.
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Crystal growth, Bismuth titanium oxide, Optical material
Citação
LOBATO, A. R.; LANFREDI, S.; CARVALHO, J. F.; HERNANDES, A C. Synthesis, crystal growth and characterization of gama-phase bismuth titanium oxide with gallium. Materials Research, São Carlos, v. 3, n. 3, p. 92-96, 2000.