The existence of a bismuth titanate in the range between Bi2Ti4O11 (Bi2O3 · 4 TiO2) and Bi4Ti3O12 (2 Bi2O3 3TiO2) has been investigated by X‐ray diffraction of samples prepared by solid state reactions. For reaction temperatures above 1100 °C and a starting composition Bi2O3 · 2 TiO2 there appeared additional lines which could be attributed to a cubic face‐centred cell with a = 10.354 Å. A multiphase Rietveld analysis based on X‐ray powder diffraction data confirmed the structural model of a pyrochlore for this compound. There is evidence that this phase belongs to the group of defect pyrochlores with a Bi3+‐deficiency resulting in a composition of Bi1.833Ti2O6.75.
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