Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Marie C, Kirkegaard"'
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
Abstract Inelastic neutron scattering (INS) is uniquely sensitive to hydrogen due to its comparatively large thermal neutron scattering cross-section (82 b). Consequently, the inclusion of water in real samples presents significant challenges to INS
Externí odkaz:
https://doaj.org/article/3deba7fe32364bb6a8e95c6fe5aafb69
Autor:
Jennifer L. Niedziela, Ketan Maheshwari, Ashley E. Shields, Andrew Miskowiec, Roger J. Kapsimalis, Daniel J. Staros, Marie C. Kirkegaard, Brian B. Anderson
Publikováno v:
The Journal of Physical Chemistry C. 123:15985-15995
Amorphous uranium oxides are known to arise via industrial processes relevant to the nuclear fuel cycle yet evade rigorous structural characterization. A promising approach is to develop statistica...
Autor:
Ketan Maheshwari, Jennifer L. Niedziela, Ashley E. Shields, Roger J. Kapsimalis, Michael W. Ambrogio, Brian B. Anderson, Marie C. Kirkegaard, Andrew Miskowiec
Publikováno v:
Optical Materials. 89:295-298
Mixed-phase and low-symmetry systems are widely observed among uranium oxide materials. Amorphous-U2O7 forms during the calcination of studtite, a uranyl peroxide mineral. Using a genetic algorithm search for stable crystalline phases, we have identi
Autor:
Marie C. Kirkegaard, Jennifer L. Niedziela, Michael W. Ambrogio, Andrew Miskowiec, Tyler L. Spano, Brian B. Anderson, Ashley E. Shields
Publikováno v:
Dalton Transactions. 48:13685-13698
Hydrated uranyl fluoride, [(UO2F2)(H2O)]7·4H2O, is not stable at elevated water vapor pressure, undergoing a complete loss of fluorine to form a uranyl hydroxide hydrate. Powder X-ray diffraction data of the resultant uranyl hydroxide species is pre
Autor:
Marie C, Kirkegaard, Tyler L, Spano, Michael W, Ambrogio, J L, Niedziela, Andrew, Miskowiec, Ashley E, Shields, Brian B, Anderson
Publikováno v:
Dalton transactions (Cambridge, England : 2003). 48(36)
Hydrated uranyl fluoride, [(UO2F2)(H2O)]7·4H2O, is not stable at elevated water vapor pressure, undergoing a complete loss of fluorine to form a uranyl hydroxide hydrate. Powder X-ray diffraction data of the resultant uranyl hydroxide species is pre
Autor:
Jennifer L. Niedziela, Brian B. Anderson, Marie C. Kirkegaard, Ashley E. Shields, Andrew Miskowiec
Publikováno v:
Inorganic chemistry. 58(11)
We confirm that synthetic uranyl hydroxide hydrate metaschoepite [(UO)24O(OH)6]·5H2O is unstable against dehydration under dry conditions, and we present a structural and vibrational spectroscopic study of synthetic metaschoepite and its ambient tem
Publikováno v:
Scientific Reports
Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
Inelastic neutron scattering (INS) is uniquely sensitive to hydrogen due to its comparatively large thermal neutron scattering cross-section (82 b). Consequently, the inclusion of water in real samples presents significant challenges to INS data anal
Autor:
Lee Trowbridge, Eugene Mamontov, Andrew Miskowiec, Brian B. Anderson, Kenneth W. Herwig, Marie C. Kirkegaard, Ashfia Huq, Adam J. Rondinone
Publikováno v:
The Journal of Physical Chemistry A. 119:11900-11910
We report a novel production method for uranium oxyfluoride [(UO2)7F14(H2O)7]·4H2O, referred to as structure D. Structure D is produced as a product of hydrating anhydrous uranyl fluoride, UO2F2, through the gas phase at ambient temperatures followe
Autor:
Marie C. Kirkegaard, Jennifer L. Niedziela, Brian B. Anderson, Tyler L. Spano, Michael W. Ambrogio, Ashley E. Shields, Andrew Miskowiec
Publikováno v:
Journal of Nuclear Materials. 529:151889
Under humid conditions, uranyl fluoride ([(UO2F2)(H2O)]7·4H2O) undergoes a loss of fluorine to form a uranyl hydroxide species, which can be further hydrated to form a uranyl peroxide species. X-ray diffraction data of the uranyl peroxide product is
Publikováno v:
Inorganic chemistry. 57(10)
We have demonstrated the solid-state formation of a uranyl peroxide (UP) species from hydrated uranyl fluoride via a uranyl hydroxide intermediate, the first observation of a UP species formed in a solid-state reaction. Water vapor pressure is shown