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Issue 0, 1970
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Protactinium(V) fluorides


The protactinium pentafluoride hydrates PaF5,2H2O and PaF5,H2O are obtained from reactions between vacuumdried protactinium(V) hydrous oxide and gaseous hydrogen fluoride at 40 and 60°, respectively. Diprotactinium(V) oxide octafluoride, Pa2OF8, is obtained from this reaction at 140° and is the ultimate product when solutions of protactinium(V) in aqueous hydrofluoric acid are evaporated to dryness in vacuo. Pa2OF8 decomposes when heated in the atmosphere at 220–290° to yield protactinium(V) dioxide monofluoride, PaO2F, which is converted into triprotactinium(V) heptaoxide monofluoride, Pa3O7F, at 560–580°. At intermediate temperatures a series of structurally related solid solutions are obtained whilst above 650° Pa2O5 is formed. PaO2F appears to be identical to the phase originally believed to be β-Pa2O5; Pa3O7F is isostructural with high-temperature U3O8. These reactions, and others involving hydrofluorination or fluorination of various protactinium(V) oxide halides, are discussed together with some chemical properties, i.r. spectral results, and X-ray powder diffraction results.

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Article type: Paper
DOI: 10.1039/J19700003378
J. Chem. Soc. A, 1970, 3378-3381

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    Protactinium(V) fluorides

    D. Brown and J. F. Easey, J. Chem. Soc. A, 1970, 3378
    DOI: 10.1039/J19700003378

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