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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61388980:_____/14:00439586 RIV/68378271:_____/14:00435544

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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Projekt

<a href="/cs/project/GP13-31276P" target="_blank" >GP13-31276P: Minerály uranu, jejich krystalová chemie a chování během zvětrávání</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

American Mineralogist

ISSN

0003-004X

e-ISSN

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Svazek periodika

99

Číslo periodika v rámci svazku

2-3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

276-282

Kód UT WoS článku

000331676800005

EID výsledku v databázi Scopus

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