SOLID SOLUTIONS WITH PYROCHLORE-LIKE STRUCTURE IN THE Y2O3–Fe2O3–Ta2O5–WO3 SYSTEM

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The aim of this work is to synthesize and study the properties of the compound Y2Fe4/3W2/3O7, and pyrochlore-like solid solutions in the Y2O3–Fe2O3–Ta2O5–WO3 system. A method for obtaining Y2Fe4/3W2/3O7 has been developed based on the citrate method. It has been established for the first time that the compound has a layered pyrochlore-like structure described by sp. gr. R3. A study of the heat capacity of Y2Fe4/3W2/3O7 showed that, unlike Y2FeTaO7, the compound does not have polymorphic transitions in the entire temperature range of 25–1460°C. The existence of a continuous solid solution xY2FeTaO7–(1–x)Y2Fe4/3W2/3O7, as well as a limited solid solution xY1.85Fe1.15TaO7–(1–x)Y2Fe4/3W2/3O7, where x = 0.7–1, is shown. It was found that a solid solution of Y2Fe4/3+xW2/3O7 is not realized. The IR and Raman spectra of synthesized solid solutions are considered. The position of their absorption edge is determined.

作者简介

A. Egorysheva

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: anna_egorysheva@rambler.ru
Moscow, Russia

E. Popova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Moscow, Russia

V. Omelyanyuk

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Moscow, Russia

O. Ellert

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Moscow, Russia

S. Kottov

National Research Center "Kurchatov Institute"

Moscow, Russia

E. Kulikova

National Research Center "Kurchatov Institute"

Moscow, Russia

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