Bismuth titanate with the pyrochlore structure has been prepared for the first time. This phase does not exist in the Bi2O3/TiO2 equilibrium phase diagram, but has now been prepared by a low-temperature synthesis route with a final calcination temperature of 600 degrees C. Structural analysis of pyrochlore bismuth titanate was performed using both synchrotron X-ray and neutron powder diffraction data. The cubic cell edge is 10.357 Angstrom, and the composition based on the refinement of the structure is Bi1.74Ti2O6.62. The Bi3+ cations are displaced off the three-fold axis by 0.38 Angstrom in a disordered manner. (C) 1998 Academic Press. [References: 15]
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