Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F14%3A10286051" target="_blank" >RIV/00216208:11310/14:10286051 - isvavai.cz</a>
Alternative codes found
RIV/61388980:_____/14:00439586 RIV/68378271:_____/14:00435544
Result on the web
<a href="http://dx.doi.org/10.2138/am.2014.4671" target="_blank" >http://dx.doi.org/10.2138/am.2014.4671</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2138/am.2014.4671" target="_blank" >10.2138/am.2014.4671</a>

Result language
angličtina
Original language name
Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study
Original language description
The crystal structure of the lead uranyl-carbonate mineral widenmannite has been solved from precession electron-diffraction data and refined using both electron-diffraction data and synchrotron powder-diffraction data. Widenmannite is orthorhombic, Pmmn, with a=4.9744(9), b=9.3816(16), c=8.9539(15) angstrom, and V=417.86(12) angstrom(3). The structure was solved by charge-flipping and refined to an R-1 = 0.1911 on the basis of 301 unique, observed reflections from electron diffraction data, and to R-pof 0.0253 and R-F of 0.0164 from X-ray powder data. The idealized structure formula of widenmannite is Pb-2(OH)(2)[(UO2)(CO3)(2)], Z = 2. However, both data sets suggest that the widenmmanite structure is not that simple. There are two symmetrically independent, partly occupied U sites. The substitution mechanism can be written as U(1)O-2 + Pb(OH)(2) - U(2)O-2. When the U(2) site is occupied, the U(1) O-2 group is absent, the two OH groups are substituted by O2- and one Pb2+-vacancy. The
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DB - Geology and mineralogy
OECD FORD branch
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Project
<a href="/en/project/GP13-31276P" target="_blank" >GP13-31276P: Uranium minerals, their crystal chemistry and behavior during weathering</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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