skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A new uranyl phosphate chain in the structure of parsonsite

Abstract

The structure of parsonsite, Pb{sub 2}[(UO{sub 2})(PO{sub 4}){sub 2}] has been solved by direct methods and refined to R = 6.0 and a goodness-of-fit (S) of 0.92 using 1187 unique observed reflections collected with MoK{alpha} X-rays and a CCD-based detector. The single unique U{sup 6+} cation is present as a (UO{sub 2}){sup 2+} uranyl ion (Ur) and is coordinated by five additional atoms of O arranged at the equatorial corners of a pentagonal bipyramid capped by the O{sub Ur} atoms. Uranyl polyhedra share an edge-forming dimers, which are cross-linked by edge- and vertex-sharing with two distinct phosphate tetrahedra, resulting in a new uranyl phosphate chain. Two symmetrically distinct Pb{sup 2+} cations are coordinated by nine and six oxygen atoms, and link adjacent uranyl phosphate chains. Parsonsite is the first uranyl phosphate mineral structure that is based upon chains of polymerized polyhedra of higher bond-valence; others contain sheets that are either based upon the autunite or phosphuranylite anion-topologies.

Authors:
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (US)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
20076089
DOE Contract Number:  
FG07-97ER14820
Resource Type:
Journal Article
Journal Name:
American Mineralogist
Additional Journal Information:
Journal Volume: 85; Journal Issue: 5-6; Other Information: PBD: May-Jun 2000; Journal ID: ISSN 0003-004X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; URANYL PHOSPHATES; LEAD PHOSPHATES; PHOSPHATE MINERALS; CRYSTAL STRUCTURE

Citation Formats

Burns, P.C. A new uranyl phosphate chain in the structure of parsonsite. United States: N. p., 2000. Web. doi:10.2138/am-2000-5-621.
Burns, P.C. A new uranyl phosphate chain in the structure of parsonsite. United States. doi:10.2138/am-2000-5-621.
Burns, P.C. Thu . "A new uranyl phosphate chain in the structure of parsonsite". United States. doi:10.2138/am-2000-5-621.
@article{osti_20076089,
title = {A new uranyl phosphate chain in the structure of parsonsite},
author = {Burns, P.C.},
abstractNote = {The structure of parsonsite, Pb{sub 2}[(UO{sub 2})(PO{sub 4}){sub 2}] has been solved by direct methods and refined to R = 6.0 and a goodness-of-fit (S) of 0.92 using 1187 unique observed reflections collected with MoK{alpha} X-rays and a CCD-based detector. The single unique U{sup 6+} cation is present as a (UO{sub 2}){sup 2+} uranyl ion (Ur) and is coordinated by five additional atoms of O arranged at the equatorial corners of a pentagonal bipyramid capped by the O{sub Ur} atoms. Uranyl polyhedra share an edge-forming dimers, which are cross-linked by edge- and vertex-sharing with two distinct phosphate tetrahedra, resulting in a new uranyl phosphate chain. Two symmetrically distinct Pb{sup 2+} cations are coordinated by nine and six oxygen atoms, and link adjacent uranyl phosphate chains. Parsonsite is the first uranyl phosphate mineral structure that is based upon chains of polymerized polyhedra of higher bond-valence; others contain sheets that are either based upon the autunite or phosphuranylite anion-topologies.},
doi = {10.2138/am-2000-5-621},
journal = {American Mineralogist},
issn = {0003-004X},
number = 5-6,
volume = 85,
place = {United States},
year = {2000},
month = {6}
}