Abstract
A new layered perovskite compound, KLaTa2O7, was synthesized by ion-exchange reaction from the rubidium compound, RbLaTa2O7. The crystal structure of KLaTa2O7 was determined by Rietveld analysis from powder X-ray diffraction patterns. It is analogous to the structure of the corresponding niobate compound. This layered perovskite compound is a new member of the Dion-Jacobson series with n=2 for the general formula A[Mn−1BnO3n+1] (A=monovalent cations, B=Nb or Ta). The structural features of KLaTa2O7 are discussed by comparison with other compounds of the ALaTa2O7 family and the titanate compounds.
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