Synthesis and Study of Potassium
Peroxypentafluorotantalate Monohydrate

S. M. Masloboeva, V. Ya. Kuznetsov, and O. A. Zalkind

Tananaev Institute of Rare Element and Mineral Chemistry and Technology, Kola Research Center, Russian Academy
of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184200 Russia

Received October 23, 2007

Abstract—Potassium peroxypentafluorotantalate monohydrate K₂TaO₂F₅ · H₂O was synthesized by the intro-
duction of hydrogen peroxide and potassium chloride into highly pure tantalum-containing fluoride solutions
at 70C followed by cooling of the mixture to room temperature at a rate of 10–15 K/h. The X-ray diffraction
analysis revealed that K₂TaO₂F₅ · H₂O crystallized in the monoclinic crystal system with the following unit cell
parameters: a = 8.965(2) Å, b = 8.966(2) Å, c = 9.257(2) Å, = 99.78(3)°, Z = 4, V_unitcell = 733.3(5) ų,
_calcd=3.681 g/cm³, FW = 404.13, space group = C2(5). The thermolysis of K₂TaO₂F₅ · H₂O was studied
at 160–1000°C, and the phases formed under specified conditions were determined.

DOI: 10.1134/S0036023609010045

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