Assessment of the U3O7 Crystal Structure by X‑ray and Electron Diffraction

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Assessment of the U3O7 Crystal Structure by X‑ray and Electron Diffraction. / Leinders, Gregory; Delville, Rémi; Pakarinen, Janne; Cardinaels, Thomas; Verwerft, Marc.

In: Inorganic Chemistry, Vol. 55, 20.09.2016, p. 9923-9936.

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@article{bd3c340a3b43423e8d0c67a93877806d,
title = "Assessment of the U3O7 Crystal Structure by X‑ray and Electron Diffraction",
abstract = "Polycrystalline U3O7 powder was synthesized by oxidation of UO2 powder under controlled conditions using in situ thermal analysis, and by heat treatment in a tubular furnace. The O/U ratio of the U3O7 phase was measured as 2.34 ± 0.01. The crystal structure was assessed from X-ray diffraction (XRD) and selected-area electron diffraction (SAED) data. Similar to U4O9−ε (more precisely U64O143), U3O7 exhibits a long-range ordered structure, which is closely related to the fluorite-type arrangement of UO2. Cations remain arranged identical to that in the fluorite structure, and excess anions form distorted cuboctahedral oxygen clusters, which periodically replace the fluorite anion arrangement. The structure can be described in an expanded unit cell containing 15 fluorite-like subcells (U15O35), and spanned by basis vectors A = ap − 2bp, B = −2ap + bp, and C = 3cp (lattice parameters of the subcell are ap = bp = 538.00 ± 0.02 pm and cp = 554.90 ± 0.02 pm; cp/ap = 1.031). The arrangement of cuboctahedra in U3O7 results in a layered structure, which is different from the well-known U4O9−ε crystal structure",
keywords = "UO2, Oxidation, U307, Crystal structure, X-ray Diffraction, Transmission Electron Microscopy",
author = "Gregory Leinders and R{\'e}mi Delville and Janne Pakarinen and Thomas Cardinaels and Marc Verwerft",
note = "Score=10",
year = "2016",
month = sep,
day = "20",
doi = "10.1021/acs.inorgchem.6b01941",
language = "English",
volume = "55",
pages = "9923--9936",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "ACS - American Chemical Society",

}

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TY - JOUR

T1 - Assessment of the U3O7 Crystal Structure by X‑ray and Electron Diffraction

AU - Leinders, Gregory

AU - Delville, Rémi

AU - Pakarinen, Janne

AU - Cardinaels, Thomas

AU - Verwerft, Marc

N1 - Score=10

PY - 2016/9/20

Y1 - 2016/9/20

N2 - Polycrystalline U3O7 powder was synthesized by oxidation of UO2 powder under controlled conditions using in situ thermal analysis, and by heat treatment in a tubular furnace. The O/U ratio of the U3O7 phase was measured as 2.34 ± 0.01. The crystal structure was assessed from X-ray diffraction (XRD) and selected-area electron diffraction (SAED) data. Similar to U4O9−ε (more precisely U64O143), U3O7 exhibits a long-range ordered structure, which is closely related to the fluorite-type arrangement of UO2. Cations remain arranged identical to that in the fluorite structure, and excess anions form distorted cuboctahedral oxygen clusters, which periodically replace the fluorite anion arrangement. The structure can be described in an expanded unit cell containing 15 fluorite-like subcells (U15O35), and spanned by basis vectors A = ap − 2bp, B = −2ap + bp, and C = 3cp (lattice parameters of the subcell are ap = bp = 538.00 ± 0.02 pm and cp = 554.90 ± 0.02 pm; cp/ap = 1.031). The arrangement of cuboctahedra in U3O7 results in a layered structure, which is different from the well-known U4O9−ε crystal structure

AB - Polycrystalline U3O7 powder was synthesized by oxidation of UO2 powder under controlled conditions using in situ thermal analysis, and by heat treatment in a tubular furnace. The O/U ratio of the U3O7 phase was measured as 2.34 ± 0.01. The crystal structure was assessed from X-ray diffraction (XRD) and selected-area electron diffraction (SAED) data. Similar to U4O9−ε (more precisely U64O143), U3O7 exhibits a long-range ordered structure, which is closely related to the fluorite-type arrangement of UO2. Cations remain arranged identical to that in the fluorite structure, and excess anions form distorted cuboctahedral oxygen clusters, which periodically replace the fluorite anion arrangement. The structure can be described in an expanded unit cell containing 15 fluorite-like subcells (U15O35), and spanned by basis vectors A = ap − 2bp, B = −2ap + bp, and C = 3cp (lattice parameters of the subcell are ap = bp = 538.00 ± 0.02 pm and cp = 554.90 ± 0.02 pm; cp/ap = 1.031). The arrangement of cuboctahedra in U3O7 results in a layered structure, which is different from the well-known U4O9−ε crystal structure

KW - UO2

KW - Oxidation

KW - U307

KW - Crystal structure

KW - X-ray Diffraction

KW - Transmission Electron Microscopy

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/19641393

U2 - 10.1021/acs.inorgchem.6b01941

DO - 10.1021/acs.inorgchem.6b01941

M3 - Article

VL - 55

SP - 9923

EP - 9936

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

ER -

ID: 1464649