Zinc molybdate

Zinc molybdate is an inorganic compound with the formula ZnMoO₄. It is used as a white pigment, which is also a corrosion inhibitor. A related pigment is sodium zinc molybdate, Na₂Zn(MoO₄)₂.^[4] The material has also been investigated as an electrode material.^[5]

Zinc molybdate^[1]

Identifiers
CAS Number	13767-32-3 Y
ECHA InfoCard	100.033.965
EC Number	237-377-8
PubChem CID	16213780
UNII	302KZX2NIS Y
CompTox Dashboard (EPA)	DTXSID10893960
Properties
Chemical formula	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)
Solubility in water	insoluble
Structure
Crystal structure	tetragonal
Hazards
GHS labelling:[3]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
NFPA 704 (fire diamond)	2 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) 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.^[4] 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.