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Hydrothermal synthesis map of bismuth titanates

DOI: 10.1016/j.jssc.2012.01.017 DOI Help

Authors: Kripasindhu Sardar (University of Warwick) , Richard Walton (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry , VOL 189 , PAGES 32 - 37

State: Published (Approved)
Published: May 2012

Abstract: The hydrothermal synthesis of four bismuth titanate materials from common bismuth and titanium precursors under hydrothermal conditions is described. Reaction of NaBiO3·2H2O and anatase TiO2 in concentrated NaOH solution at 240 °C is shown to produce perovskite and sillenite phases Na0.5Bi0.5TiO3 and Bi12TiO20, depending on the ratio of metal precursors used. When KOH solution is used and a 1:1 ratio of the same precursors, a pyrochlore Bi1.43Ti2O6(OH)0.29(H2O)0.66 is formed. The use of a mixture of HNO3 and NaOH is shown to facilitate the formation of the Aurivillius-type bismuth titanate Bi4Ti3O12. The phases have been isolated separately as phase-pure powders and profile refinement of powder X-ray diffraction data allows comparisons with comparable materials reported in the literature. Analysis of Bi LIII-edge X-ray absorption near edge structure (XANES) spectra of the materials shows the oxidation state of bismuth is +3 in all of the hydrothermally derived products.

Journal Keywords: Solvothermal; Perovskite; Pyrochlore; Aurivillius; XANES

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Added On: 07/11/2012 12:54

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