The aim of this work was to prepare and characterize the compound Y2Fe4/3W2/3O7 and pyrochlore-like solid solutions in the Y2O3–Fe2O3–Ta2O5–WO3 system. The Y2Fe4/3W2/3O7 preparation method was developed based on the citrate process. The compound was found to have a pyrochlore-like layered structure described by space group R 3. Heat capacity measurements showed that Y2Fe4/3W2/3O7, unlike Y2FeTaO7, does not have polymorphic transitions over the entire temperature range from 25 to 1460°C. The xY2FeTaO– (1–x) Y2Fe4/3W2/3O7 continuous solid solutions and limited xY1. 85Fe1. 15TaO7‒ (1‒x) Y2Fe4/3W2/3O7 solid solutions, where x = 0. 7–1, were shown to exist. The Y2xFe4/3+x W2/3O7 solid solution was not realized. The IR and Raman spectra of the prepared solid solutions were considered. The absorption edge positions were determined.
Egorysheva et al. (Sat,) studied this question.