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| 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-p of 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 chemical formula of the real structure should be written as Pb2-x(OH)(2-2x)[(UO2)(CO3)(2)], where x is the probability of the substitution U(2) -> U(1). The probability of occurrence of U(2) refines to x = 0.074(15) from the powder-diffraction data and to x = 0.176(4) from the electron-diffraction data. There is one Pb site (nearly fully occupied), which is coordinated by 11 anions (up to the distance of 3.5 angstrom), including O and OH-. The shorter Pb-O bonds form a sheet structure, which is linked by the weaker bonds to the uranyl-carbonate chains to form a three-dimensional framework structure.
- 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-p of 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 chemical formula of the real structure should be written as Pb2-x(OH)(2-2x)[(UO2)(CO3)(2)], where x is the probability of the substitution U(2) -> U(1). The probability of occurrence of U(2) refines to x = 0.074(15) from the powder-diffraction data and to x = 0.176(4) from the electron-diffraction data. There is one Pb site (nearly fully occupied), which is coordinated by 11 anions (up to the distance of 3.5 angstrom), including O and OH-. The shorter Pb-O bonds form a sheet structure, which is linked by the weaker bonds to the uranyl-carbonate chains to form a three-dimensional framework structure. (en)
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| Title
| - Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study
- Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study (en)
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| skos:prefLabel
| - Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study
- Crystal structure of lead uranyl carbonate mineral widenmannite: Precession electron-diffraction and synchrotron powder-diffraction study (en)
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| skos:notation
| - RIV/00216208:11310/14:10286051!RIV15-MSM-11310___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/00216208:11310/14:10286051
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - synchrotron powder diffraction; precession electron diffraction; crystal structure; uranyl bicarbonate; widenmannite (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Klementová, Mariana
- Palatinus, Lukáš
- Plášil, Jakub
- Škácha, Pavel
- Goliáš, Viktor
- Rohlíček, Jan
- Houdková, Lenka
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| http://linked.open...ain/vavai/riv/wos
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| issn
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| number of pages
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| http://bibframe.org/vocab/doi
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| http://localhost/t...ganizacniJednotka
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