Bismuth titanate

 ( Titanates ) 

Bismuth titanate or bismuth titanium oxide is a solid inorganic compound of bismuth, titanium and oxygen with the chemical formula of Bi₁₂TiO₂₀, Bi ₄Ti₃O₁₂ or Bi₂Ti₂O₇.

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Synthesis Bismuth titanate ceramics can be produced by heating a mixture of bismuth and titanium oxides. Bi₁₂TiO₂₀ forms at 730–850 °C, and melts when the temperature is raised above 875 °C, decomposing in the melt to Bi₄Ti₃O₁₂ and Bi₂O₃. Millimeter-sized single crystals of Bi₁₂TiO₂₀ can be grown by the Czochralski process, from the molten phase at 880–900 °C.

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Properties and applications

Bismuth titanates exhibit electrooptical effect and photorefractive effect, that is, a reversible change in the refractive index under applied electric field or illumination, respectively. Consequently, they have potential applications in reversible recording media for real-time holography or image processing applications.

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See also

• Bismuth germanate
• Sillénite

Categories: Titanates, Bismuth Compounds, Ceramic Materials, Piezoelectric Materials, Ferroelectric Materials

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