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Transformation of chernikovite into meta-uranocircite II, Ba(UO2)2(PO4)2.6H2O and study of its solubility

Published online by Cambridge University Press:  05 July 2018

R. F. Vochten ,
L. Van Haverbeke  and
K. Van Springel
R. F. Vochten
Affiliation:
Laboratorium voor Chemische en Fysische Mineralogie, Universiteit Antwerpen, Middleheimlaan 1, 2020 Antwerpen, Belgium
L. Van Haverbeke
Affiliation:
Laboratorium voor Anorganische Scheikunde, Universiteit Antwerpen, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
K. Van Springel
Affiliation:
Laboratorium voor Chemische en Fysische Mineralogie, Universiteit Antwerpen, Middleheimlaan 1, 2020 Antwerpen, Belgium
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Abstract

Chernikovite, (H3O)2(UO2)2(PO4)2, was synthesized and subsequently transformed into metauranocircite II, Ba(UO2)2(PO4)2.6H2O, by ion-exchange experiments. The crystals are lemon-yellow and strongly fluorescent. From solubility data a mean pKs value at 25°C was determined as 51.79 ± 0.21. For a cell volume of 16.31.7 Å3 and Z = 4 the density was calculated as 3.970 g/cm3 whereas the measured density is 3.964 g/cm 3. The X-ray powder pattern shows the following strongest lines: 3.609(60)(114), 3.470(60)(123), 2.9272(90)(132)2.9006(90)(312), 2.6065(80)(116), 2.4581(75)(233), 2.2015(100)(143 ; 143), 2.1869(100) (241 ; 226 ;241).

Keywords

meta-uranocircite IIuranylphosphate groupthermal behavioursolubility product
Type
Mineralogy
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 367 - 372
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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