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Revision as of 08:28, 13 October 2011 editCheMoBot (talk | contribs)Bots141,565 edits Updating {{chembox}} (no changed fields - added verified revid - updated 'ChemSpiderID_Ref', 'DrugBank_Ref', 'UNII_Ref', 'ChEMBL_Ref', 'ChEBI_Ref', 'KEGG_Ref', 'StdInChI_Ref', 'StdInChIKey_Ref', 'ChEBI_Ref') per [[WP:CHEMVALID|Chem/Drugbox validat...← Previous edit Latest revision as of 23:12, 30 October 2024 edit undoAzariahTheWarrior (talk | contribs)11 editsm Updated page to mention recent literature and corrected publication date of ref 1 
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{{Unreferenced|date=May 2010}}
{{Chembox {{Chembox
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⚫ | ImageFile1 = Ammoniumdiuranat.jpg
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| ImageSize1 = 250px
| ImageFile2 = Ammonium_diuranate_under_UV.jpg
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| IUPACName = | IUPACName =
| OtherNames = | OtherNames =
| Section1 = {{Chembox Identifiers |Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = | CASNo = 7783-22-4
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| UNII_Ref = {{fdacite|correct|FDA}}
⚫ | ChemSpiderID = 170692
| UNII = 39Y3LFK95B
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
⚫ | ChemSpiderID = 21257707
| StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2H3N.7O.2U/h2*1H3;;;;;;;;;/q;;7*-2;;/p+2 | StdInChI = 1S/2H3N.7O.2U/h2*1H3;;;;;;;;;/q;;7*-2;;/p+2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = ZAASRHQPRFFWCS-UHFFFAOYSA-P | StdInChIKey = ZAASRHQPRFFWCS-UHFFFAOYSA-P
| PubChem = | PubChem = 197096
| SMILES = }} | SMILES = }}
| Section2 = {{Chembox Properties |Section2={{Chembox Properties
| Formula = (NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub> | Formula = (NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub>
| N=2 | H=8 | U=2 | O=7
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| Density = | Appearance =
| MeltingPt = | Density =
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| Solubility = }} | BoilingPt =
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| Section3 = {{Chembox Hazards |Section3={{Chembox Hazards
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| FlashPt = | MainHazards =
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}}'''Ammonium diuranate''' or '''(ADU)''' ((NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub>), is one of the intermediate chemical forms of ] produced during ] production. The name 'yellowcake' originally given to this bright yellow substance, now applies to mixtures of uranium oxides which are actually hardly ever yellow. It also is an intermediate in mixed-oxide (]) fuel fabrication.
}}'''Ammonium diuranate''' or '''(ADU)''' ((NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub>), is one of the intermediate chemical forms of ] produced during ] production. The name "yellowcake" originally given to this bright yellow salt, now applies to mixtures of uranium oxides which are actually hardly ever yellow. It also is an intermediate in mixed-oxide (]) fuel fabrication. Although it is usually called "ammonium diuranate" as though it has a "diuranate" ion {{chem|U|2|O|7|2-}}, this is not necessarily the case. It can also be called diammonium diuranium heptaoxide. The structure was theorized to be similar to that of ].<ref>{{cite journal |last1=C. N. Turcanu & R. Deju |title=Thermal Analysis of Ammonium Diuranate |journal=Nuclear Technology |date=Sep 1979 |volume=45 |issue=2 |pages=188–192 |doi=10.13182/NT79-A32310 |quote=All types of ADU when analyzed by x-ray diffraction have a structure similar to UO3-2H2O}}</ref><ref>{{cite journal|display-authors=etal |last1=C. N. Turcanu |title=Analiza termica a diuranatului de amoniu |date=Apr 1976 |url=https://inis.iaea.org/collection/NCLCollectionStore/_Public/07/265/7265175.pdf|quote=Analiza cu raze X arată pentru ADU o structură cristalină apropiată de UO3·2H2O}}, citing {{cite journal |last1=J. B. Ainscough, B. W. Oldfield |title=Effect of ammonium diuranate precipitation conditions on the characteristics and sintering behaviour of uranium dioxide |journal=Journal of Applied Chemistry |date=Sep 1962 |volume=12 |issue=9 |pages=418–424 |doi=10.1002/jctb.5010120907}} and {{cite journal |last1=E.H.P.Cordfunke |title=On the uranates of ammonium—I: The ternary system NH3-UO3-H2O |journal=Journal of Inorganic and Nuclear Chemistry |date=Mar 1962 |volume=24|doi=10.1016/0022-1902(62)80184-5}}</ref> Recent literature has shown that the structure more closely resembles the mineral metaschoepite, the partially dehydrated form of ].<ref>Gerber, E. et al. (2024) ‘Ammonium Polyuranates: Old Dog, New Structural Tricks’, Inorganic Chemistry, 63(29), pp. 13402–13412. Available at: https://doi.org/10.1021/acs.inorgchem.4c01292.
</ref>


It is ]d during production by adding aqueous ] after uranium extraction by ]s in an organic ] solvent. This precipitate is then thickened and centrifuged before being ] to ]. Canadian practice favours the production of ] from ammonium diuranate, rather than from ] as is the case elsewhere. It is ]d by adding aqueous ] after uranium extraction by ]s in ]. This precipitate is then thickened and centrifuged before being ] to ]. Canadian practice favours the production of ] from ammonium diuranate, rather than from ] as is the case elsewhere.{{cn|date=April 2019}}


Ammonium diuranate was once used to produce colored glazes in ceramics.<ref>{{Cite journal|last1=Safford|first1=Hurd W.|last2=Kuebel|first2=A.|date=1943-02-01|title=Preparations and properties of ammonium diuranate|journal=Journal of Chemical Education|volume=20|issue=2|pages=88|doi=10.1021/ed020p88|issn=0021-9584|bibcode = 1943JChEd..20...88S }}</ref> However, when being fired this will decompose to uranium oxide, so the uranate was only used as a lower-cost material than the fully purified uranium oxide.
Ammonium diuranate was once used to produce colored glazes in ceramics.


==References== ==References==
{{reflist}} {{reflist}}
{{uranium compounds}}


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