Aluminium molybdate
Aluminium molybdate is the chemical compound Al2(MoO4)3. It forms in certain hydrodesulfurization catalysts when alumina is doped with excess molybdenum.[1] When molybdates are used to inhibit corrosion in aluminum piping, the protective film formed is hydrated aluminum molybdate.[2][3] Although small quantities of aluminum molybdate form during aluminothermic reduction of molybdia, mechanical activation inhibits their formation.[4]
Large-scale samples can be prepared via sol-gel synthesis,[5] and have been proposed for molybdenum-99 storage in nuclear medicine.[6]
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.[7] At high temperatures, the crystal rearranges to βTemplate:NbhAl2(MoO4)3, isostructural with scandium tungstate.[8]
Aluminum molybdate has a very low thermal expansion coefficient near room temperature.
References
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