Aluminium molybdate

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Aluminium molybdate
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.035.607 Edit this at Wikidata
  • InChI=1S/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1 checkY
    Key: NKSYNYABFPVRNP-UHFFFAOYSA-N checkY
  • InChI=1/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1
    Key: NKSYNYABFPVRNP-WODKIKDAAY
  • [Al+3].[Al+3].[O-][Mo](=O)(=O)[O-].[O-][Mo]([O-])(=O)=O.[O-][Mo]([O-])(=O)=O
Properties
Al2(MoO4)3
Molar mass 533.77 g mol−1
Appearance grey, metallic solid/powder
odorless
Melting point 705 °C (1,301 °F; 978 K)
slightly soluble in water
Structure[1]
P21/a, No. 14
a = 15.3803(9) Å, b = 9.0443(1) Å, c = 17.888(1) Å
α = 90°, β = 125.382(3)°, γ = 90°
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability (red): no hazard codeInstability (yellow): no hazard codeSpecial hazards (white): no code
1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Aluminium molybdate is the

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

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

  1. ^
    doi:10.1016/0022-4596(88)90226-5
    .
  2. doi:10.1016/0021-9517(78)90110-0 – via Eindhoven University of Technology
    library.
  3. ISSN 0010-938X
    .
  4. S2CID 259872397
    .
  5. S2CID 149603638
    .
  6. S2CID 97549526
    .
  7. S2CID 106317533
    .
  8. ISSN 0025-5408
    .

External links
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