Zinc molybdate

Zinc molybdate is an inorganic compound with the formula ZnMoO4. It is used as a white pigment, which that is also a corrosion inhibitor. A related pigment is sodium zinc molybdate, Na2Zn(MoO4)2.[3] The material has also been investigated as an electrode material.[4]

Zinc molybdate[1]
Identifiers
ECHA InfoCard 100.033.965
UNII
Properties
ZnMoO4
Molar mass 225.33 g/mol
Appearance white tetragonal crystals
Density 4.32 g/cm3[2]
Melting point 900 °C (1,650 °F; 1,170 K)
insoluble
Structure
tetragonal
Hazards
not listed
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

In terms of its structure, the Mo(VI) centers are tetrahedral and the Zn(II) centers are octahedral.[2]

Safety

The LD50 (oral, rats) is 11,500 mg/kg.[3] While highly soluble molybdates like e.g. sodium molybdate are toxic in higher doses, zinc molybdate is essentially non-toxic because of its insolubility in water. Molybdates possess a lower toxicity than chromates or lead salts and are therefore seen as an alternative to these salts for corrosion inhibition.

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References
  1. Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–95, ISBN 978-0-8493-0594-8
  2. Ait Ahsaine, H.; Zbair, M.; Ezahri, M.; Benlhachemi, A.; Arab, M.; Bakiz, B.; Guinneton, F.; Gavarri, J. R. (2015). "Rietveld Refinements, Impedance Spectroscopy and Phase Transition of the Polycrystalline ZnMoO4 Ceramics". Ceramics International. 41 (10): 15193–15201. doi:10.1016/j.ceramint.2015.08.094.CS1 maint: multiple names: authors list (link)
  3. G. Etzrodt (2012). "Pigments, Inorganic 5. Anticorrosive Pigments". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.n20_n04.
  4. Hu, Xianluo; Zhang, Wei; Liu, Xiaoxiao; Mei, Yueni; Huang, Yunhui (2015). "Nanostructured Mo-based electrode materials for electrochemical Energy Storage". Chemical Society Reviews. 44 (8): 2376–404. doi:10.1039/C4CS00350K. PMID 25688809.


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