24:
271:
unit. In this case, a tetrameric ring would be the most stable conformation of the compound. The presence of a peroxide bond in species obtained in this temperature range is unusual; uranyl peroxide has previously been considered to be the only peroxide bearing uranium compound. Developments on this
226:
is produced by the thermal decomposition of uranyl peroxide tetrahydrate at temperatures between 150 and 500 °C (300 and 930 °F), in either an air or nitrogen atmosphere. The resultant powder is tan orange in colour. Further heating results in the formation of
355:
S. Odoh, J. Shamblin, C. Colla, S. Hickam, H. Lobeck, R. Lopez, T. Olds, J. Szymanowski, G. Sigmon, J. Neuefeind, W. Casey, M. Lang, L. Gagliardi and P. Burns, Structure and
Reactivity of X-ray Amorphous Uranyl Peroxide,
207:. As a result, the molecular structure of this material is little understood, although experimental and computational attempts to elucidate a local atomic environment have yielded some success.
336:
L. Sweet, C. Henager, S. Hu, T. Johnson, D. Meier, S. Peper and J. Schwantes, PNNL-20951: Investigation of
Uranium Polymorphs, PNNL for U.S Department of Energy, 2011.
255:, the long-range atomic structure of this compound has not been determined. However, recent computational investigations, chiefly accomplished using
383:
A. Shields, A. Miskowiec, J. Niedziela, M. Kirkegaard, K. Maheshwari, M. Ambrogio, R. Kapsimalis and B. Anderson, Shining a light on amorphous U
203:
does not comprise a regular, long-range atomic structure, as demonstrated by its characteristic diffuse scattering pattern obtained by
411:
Thompson, Nathan B. A.; Middleburgh, Simon C.; Evitts, Lee J.; Gilbert, Matthew R.; Stennett, Martin C.; Hyatt, Neil C. (2020-12-15).
276:-like bonding environment, including the bond types already mentioned. Few other suggestions for the local atomic structure of a
507:
296:, calculated as a two-site 6 and 8-coordinate structure, has been reported. In the same study, it was again found that the U
320:
powder. In addition to a change in crystallinity, this reaction involves a change in colour from orange to bright yellow.
412:
157:
256:
191:
at temperatures between 150 and 500 °C (300 and 930 °F). It exists at room temperature as a powder.
391:: A computational approach to understanding amorphous uranium materials, Opt. Mater., 2019, 89, 295-298.
36:
435:
142:
459:
451:
204:
485:
443:
392:
365:
337:
228:
111:
63:
188:
138:
187:
is an orange diuranyl compound, most commonly obtained from the thermal decomposition of
439:
259:, have helped to predict a local structure. Resembling a regular uranate compound, two
151:
501:
463:
447:
369:
316:
is known to undergo hydrolysis in the presence of water, to produce a crystalline
396:
484:: The first structure of a peroxide mineral, Am. Mineral., 2003, 88, 1165-1168.
341:
82:
455:
317:
489:
268:
413:"Short communication on further elucidating the structure of amorphous U
129:
100:
23:
260:
150:
Except where otherwise noted, data are given for materials in their
132:
421:
by extended X-ray absorption spectroscopy and DFT simulations"
267:-O atom, where both uranium atoms are bonded to an
288:have been made. However, a crystalline form of U
272:structure propose a two-site metastudtite and UO
8:
364:, J. Inorg. Chem., 2016, 55, pp.3541-3546.
15:
329:
7:
476:P. Burns and K. Hughes, Studtite, (H
406:
404:
379:
377:
351:
349:
304:species contained peroxide bonding.
14:
243:Due to the amorphous nature of a
22:
257:density functional theory (DFT)
154:(at 25 °C , 100 kPa).
1:
448:10.1016/j.jnucmat.2020.152476
370:10.1021/acs.inorgchem.6b00017
428:Journal of Nuclear Materials
397:10.1016/j.optmat.2019.01.040
229:alpha uranium trioxide (α-UO
189:uranyl peroxide tetrahydrate
17:Amorphous uranium(VI) oxide
170:Amorphous uranium(VI) oxide
524:
342:10.13140/RG.2.1.3073.0004
263:groups are bridged by a μ
148:
121:
56:
45:
35:
30:
21:
239:Structure and reactivity
87:588 g/mol
508:Uranium(VI) compounds
490:10.2138/am-2003-0725
95:Orange-brown powder
440:2020JNuM..54252476T
143:Triuranium octoxide
112:Solubility in water
18:
158:Infobox references
122:Related compounds
117:Partially soluble
40:Diuranyl heptoxide
16:
205:X-ray diffraction
166:Chemical compound
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163:
515:
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64:Chemical formula
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19:
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184:
180:
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139:Uranyl peroxide
135:
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76:
72:
66:
52:
51:
41:
12:
11:
5:
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182:
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152:standard state
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136:
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97:
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62:
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28:
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13:
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6:
4:
3:
2:
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491:
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371:
367:
352:
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323:
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319:
318:metaschoepite
307:
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55:
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48:Amorphous UO
46:Other names
92:Appearance
57:Properties
434:: 152476.
324:References
269:O-O peroxo
211:Production
83:Molar mass
37:IUPAC name
464:225232737
456:0022-3115
261:uranyl ()
105:6.8 g/cm
502:Category
128:Related
436:Bibcode
130:uranium
101:Density
77:
462:
454:
133:oxides
31:Names
460:S2CID
424:(PDF)
452:ISSN
69:Am-U
486:doi
444:doi
432:542
393:doi
366:doi
338:doi
504::
480:O)
458:.
450:.
442:.
430:.
426:.
403:^
376:^
348:^
308:-U
306:Am
280:-U
247:-U
235:.
218:-U
216:Am
195:-U
193:Am
177:-U
175:am
488::
482:2
478:2
466:.
446::
438::
419:7
417:O
415:2
395::
389:7
387:O
385:2
368::
362:7
360:O
358:2
356:U
340::
314:7
312:O
310:2
302:7
300:O
298:2
294:7
292:O
290:2
286:7
284:O
282:2
278:m
274:3
265:2
253:7
251:O
249:2
245:m
233:)
231:3
224:7
222:O
220:2
201:7
199:O
197:2
185:)
183:7
181:O
179:2
173:(
75:7
73:O
71:2
50:3
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