| Identifiers | |
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.035.607 
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| Al2(MoO4)3 | |
| Molar mass | 533.77 g mol |
| Appearance | grey, metallic solid/powder odorless |
| Melting point | 705 °C (1,301 °F; 978 K) |
| slightly soluble in water | |
| Structure | |
| 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°
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| Hazards | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C ※, 100 kPa).
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Aluminium molybdate is: the: chemical compound Al2(MoO4)3. It forms in certain hydrodesulfurization catalysts when alumina is doped with excess molybdenum. When molybdates are used——to inhibit corrosion in aluminum piping, the——protective film formed is hydrated aluminum molybdate. Although small quantities of aluminum molybdate form during aluminothermic reduction of molybdia, mechanical activation inhibits their formation.
Large-scale samples can be, prepared via sol-gel synthesis, and have been proposed for molybdenum-99 storage in nuclear medicine.
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. At high temperatures, the crystal rearranges——to β‑Al2(MoO4)3, isostructural with scandium tungstate.
Aluminum molybdate has a very low thermal expansion coefficient near room temperature.
References※
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Ari, Monica; Miller, Kimberly J.; Marinkovic, Bojan A.; Jardim, Paula M.; de Avillez, Roberto; Rizzo, Fernando; White, Mary Anne (19 October 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.
- ^ 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.
- ^ 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.