Transformations of Cerium Tetrafluoride Hydrate under Hydrothermal Conditions: A New Cerium Fluoride Hydrate Се<sub>3</sub>F<sub>10</sub> ⋅ 3Н<sub>2</sub>О

Author:

Il’in E. G.1,Parshakov A. S.1,Iskhakova L. D.2,Kottsov S. Yu.1,Filippova A. D.1,Goeva L. V.1,Simonenko N. P.1,Baranchikov A. E.1,Ivanov V. K.1

Affiliation:

1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

2. Dianov Fiber Optics Research Center, Prokhorov Institute of General Physics, Russian Academy of Sciences

Abstract

The behavior of cerium tetrafluoride hydrate was studied in water at a temperature of 80°C and under hydrothermal treatment at 100, 130, and 220°C for a day. The product of the hydrothermal treatment of CeF4·H2O at 100°C was investigated by chemical, thermogravimetric, IR spectroscopic, and X-ray powder diffraction analyses, which identified a new cerium fluoride with the composition, presumably, Ce3F10⋅3H2O or, most likely, (H3O)Ce3F10⋅2H2O. New compound crystallizes in the space groupwith a unit cell parameter of 11.66 Å. Hydrothermal treatment of cerium tetrafluoride hydrate at temperatures above 130°C leads to hydrolysis and reduction of cerium(IV) fluoride compounds to form CeO2 and CeF3.

Publisher

The Russian Academy of Sciences

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