Title
Transformation of chernikovite into parsonsite and study of its solubility product Transformation of chernikovite into parsonsite and study of its solubility product
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Stuttgart ,
Subject
Biology
Source (journal)
Neues Jahrbuch für Mineralogie: Monatshefte. - Stuttgart
Volume/pages
(1991) :12 , p. 551-558
ISSN
0028-3649
ISI
A1991HC36600003
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Chernikovite, (H3O)2(UO2)(PO4)2.6H2O, was synthetically prepared from schoepite, UO2(OH)2.2H2O, and transformed into synthetic parsonsite Pb2(UO2) (PO4)2 . nH2O by ion exchange with Pb2+-ions. Chemical analysis of synthetic parsonsite yields a composition Pb2(UO2)(PO4)2-0.5H2O that is quite identical with natural parsonsite. The crystals are pale yellow and not fluorescent. The space group is P1BAR and the cell parameters are: a = 6.8487 angstrom +/- 0.0002, b = 10.3599 angstrom +/- 0.0004, c = 6.6712 angstrom +/- 0.0002. alpha = 101.843-degrees +/- 0.003, beta = 98.233-degrees +/- 0.003, gamma = 86.361-degrees +/- 0.003. For a cell volume of 456.5 angstrom 3 a formular weight of 874.7 and measured density of 6.21 g/cm3 a value of Z = 1.96 is calculated. The X-ray powder pattern shows the following ten strongest lines: 3.396(60), 3.276(55), 3.247(60), 3.232(80), 3.152(90), 3.082(70), 3.009(70), 2.9272(90), 2.7870(60), 2.7630(100).
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