Abstract:
A set of techniques for analyzing multicomponent oxide powders with a pyrochlore structure using the Rietveld method was developed, which allows for precise refinement of the compounds composition in the presence of atoms of different types in each of two structurally non-equivalent crystallographic positions ($A$ and $B$). The developed method was tested using the example of the Bi$_2$O$_3$–Na$_2$O–Fe$_2$O$_3$–WO$_3$ system and made it possible to determine the precise composition of a compound with a pyrochlore structure in a sample obtained by hydrothermal synthesis – (Bi$_{1.08}$Na$_{0.08}$$\Box_{0.84}$)(Fe$_{0.44}$W$_{1.56}$)O$_7$, where $\Box$ – cation vacancy.
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