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A number of new Bi m+1Fe m−3TiO3 m+3 compounds with integer and fractional m values are identified in the Bi4Ti3O12-BiFeO3 system. All of the compounds are shown to have Aurivillius-type structures. The phase-transition and decomposition temperatures of the new and earlier known compounds of the Bi4Ti3O12-BiFeO3 system are determined. The linear thermal expansion coefficients of the synthesized compounds are evaluated using dilatometry, and their sintering onset temperatures are determined. [ABSTRACT FROM AUTHOR]

New ferroelectric compounds with a layered perovskite-like structure are obtained in the Bi4Ti3O12–BiFeO3 system. The mechanism of the formation of A m – 1Bi2M mO3 m + 3 compounds by solid-state reactions is discussed. [ABSTRACT FROM AUTHOR]