From Wikipedia, the free encyclopedia
Aluminium molybdate
Identifiers
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ChemSpider
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ECHA InfoCard
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100.035.607
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InChI=1S/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1 YKey: NKSYNYABFPVRNP-UHFFFAOYSA-N YInChI=1/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1 Key: NKSYNYABFPVRNP-WODKIKDAAY
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[Al+3].[Al+3].[O-][Mo](=O)(=O)[O-].[O-][Mo]([O-])(=O)=O.[O-][Mo]([O-])(=O)=O
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Properties
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Al2(MoO4)3
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Molar mass
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533.77 g mol−1
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Appearance
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grey, metallic solid/powder odorless
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Melting point
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705 °C (1,301 °F; 978 K)
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slightly soluble in water
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Structure
[1]
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P21/a, No. 14
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a = 15.3803(9) Å, b = 9.0443(1) Å, c = 17.888(1) Å α = 90°, β = 125.382(3)°, γ = 90°
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Hazards
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NFPA 704 (fire diamond)
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Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Aluminium molybdate is the
chemical compound Al2(MoO4)3. It forms in certain
hydrodesulfurization catalysts when
alumina is
doped with excess
molybdenum.
[2] When
molybdates are used to inhibit corrosion in aluminum piping, the
protective film formed is hydrated aluminum molybdate.
[3]
[4] Although small quantities of aluminum molybdate form during
aluminothermic reduction of
molybdia, mechanical activation inhibits their formation.
[5]
Large-scale samples can be prepared via
sol-gel synthesis,
[6] and have been proposed for
molybdenum-99 storage in
nuclear medicine.
[7]
The
room temperature
crystal structure was refined using
time-of-flight powder
neutron diffraction data. It is
monoclinic and
isostructural with Fe2(MoO4)3 and Cr2(MoO4)3.
[1] At high temperatures, the crystal rearranges to β‑Al2(MoO4)3, isostructural with
scandium tungstate.
[8]
Aluminum molybdate has a very low
thermal expansion coefficient near room temperature.
References
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a
b Harrison, W. T. A.; Cheetham, A. K.; Faber, J. (1988).
"The crystal structure of aluminium molybdate". Journal of Solid State Chemistry. 76 (2): 328–333.
Bibcode:
1988JSSCh..76..328H.
doi:
10.1016/0022-4596(88)90226-5.
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^ Medema, J.; van Stam, C.; de Beer, V. H. J.; Konings, A. J. A.; Koningsberger, D. C. (2 May 1977).
"Raman spectroscopic study of Co–Mo/γ-Al2O3 catalysts" (PDF). Journal of Catalysis. 53 (published 1978): 386–400.
doi:
10.1016/0021-9517(78)90110-0 – via
Eindhoven University of Technology library.
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^ McCune, R. C.; Shilts, R. L.; Ferguson, S. M. (1982-01-01).
"A study of film formation on aluminum in aqueous solutions using Rutherford backscattering spectroscopy". Corrosion Science. 22 (11): 1049–1065.
doi:
10.1016/0010-938X(82)90091-9.
ISSN
0010-938X.
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^ Byrne, Christian E.; Quesada Cangahuala, Nereida V.; D'Alessandro, Oriana; Deyá, Cecilia (2023-07-10).
"Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions". Materials and Corrosion. 75: 73–83.
doi:
10.1002/maco.202313940.
ISSN
0947-5117.
S2CID
259872397.
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^ Sheybani, K.; Paydar, M. H.; Shariat, M. H. (2019-08-01).
"Effect of mechanical activation on aluminothermic reduction of molybdenum trioxide". International Journal of Refractory Metals and Hard Materials. 82: 245–254.
doi:
10.1016/j.ijrmhm.2019.04.015.
ISSN
0263-4368.
S2CID
149603638.
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^ Ari, Monica; Miller, Kimberly J.; Marinkovic, Bojan A.; Jardim, Paula M.; de Avillez, Roberto; Rizzo, Fernando; White, Mary Anne (19 October 2010) [19 November 2010].
"Rapid synthesis of the low thermal expansion phase of Al2Mo3O12 via a sol–gel method using polyvinyl alcohol". Journal of Sol-Gel Science and Technology. 58. Springer (published 2011): 121–125.
doi:
10.1007/s10971-010-2364-9.
S2CID
97549526.
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^ Amin, M.; El-Amir, M. A.; Ramadan, H. E.; El-Said, H. (2018-11-01).
"99Mo/99mTc generators based on aluminum molybdate gel matrix prepared by nano method". Journal of Radioanalytical and Nuclear Chemistry. 318 (2): 915–922.
doi:
10.1007/s10967-018-6141-5.
ISSN
1588-2780.
S2CID
106317533.
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^ Harrison, William T. A. (1995-11-01).
"Crystal structures of paraelastic aluminum molybdate and ferric molybdate, β-Al2(MoO4)3 and β-Fe2(MoO4)3". Materials Research Bulletin. 30 (11): 1325–1331.
doi:
10.1016/0025-5408(95)00157-3.
ISSN
0025-5408.
External links
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Al(I) |
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Al(II) | |
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Al(III) |
Alums | |
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Organoaluminium(III) compounds | |
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Molybdates |
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Dimolybdates | |
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Related | |
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