Nickel tungstate

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Names
Other names

Nickel(II) tungstate
Nickel tungsten oxide

Identifiers

CAS Number

* 14177-51-6 N

3D model (JSmol)

* Interactive image

ChemSpider |

* 75997

EC Number |

* 238-032-4

PubChem CID

* 84240

InChI

* InChI=1S/Ni.4O.W/q+2;;;2*-1;

Key: QLTKZXWDJGMCAR-UHFFFAOYSA-N

SMILES

* [O-][W](=O)(=O)[O-].[Ni+2]

Properties

Chemical formula

| NiWO4
Molar mass | 306.534
Appearance  | green crystals[1]
Odor | odourless[1][2]
Density | 3.3723 g/cm³[3]
Melting point | 1420 ˚C[4]

Solubility in water

| 465,2 mg/100 mL (20 ˚C)
Solubility | soluble in ammonia
Structure

Crystal structure

| monoclinic crystal system
Hazards
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H317, H350i, H372

GHS precautionary statements

| P201, P260, P280, P308+313, P405, P501
Related compounds

Other anions

| Nickel(II) chromate
Nickel(II) molybdate

Other cations

| Iron(II) tungstate
Cobalt(II) tungstate
Zinc(II) tungstate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Nickel tungstate is an inorganic compound of nickel, tungsten and oxygen, with the chemical formula of NiWO4.

## Contents

* 1 Preparation
* 2 Properties
* 3 Applications
* 4 Other compounds
* 5 References

## Preparation

Nickel tungstate can be prepared by the reaction of nickel(II) nitrate and sodium tungstate:[5]

Ni(NO3)2 \+ Na2WO4 → NiWO4 \+ 2 NaNO3

Nickel tungstate can also be prepared by the reaction of nickel(II) oxide and tungsten(VI) oxide.[6]

It can also be obtained by the reaction of ammonium metatungstate and nickel(II) nitrate[7] or from the reaction of sodium tungstate, nickel(II) chloride and sodium chloride.[8]

Nickel tungstate undergoes a phase transition at 700°C.[5]

## Properties

Nickel tungstate is a light brown, odourless solid that is insoluble in water.[2] The amorphous form is green and the polycrystalline form is brown.[5] It crystallizes in the wolframite crystal structure of the monoclinic crystal system with space group P2/c (No. 13).[9][8] The compound is antiferromagnetic.[10][11]

## Applications

Nickel tungstate has no commercial uses. It has been examined as a photocatalyst, in humidity sensors, and in dielectric resonators. It is also considered as a "promising" cathode material for asymmetric supercapacitors.[1][12]

## Other compounds

Nickel tungstate forms compounds with ammonia, such as NiWO4·2NH3·H2O which are cyan crystals,[13] NiWO4·4NH3 which are green crystals,[14] NiWO4·5NH3·H2O as dark blue crystals[13] or anhydrous NiWO4·6NH3 which is crystalline purple, while the octahydrate of hexamine is dark blue.[14]

## References

1. ↑ 1.0 1.1 1.2 Nickel tungsten oxide, 99.9% (metals basis excluding Co), Co <100ppm at AlfaAesar, accessed on {{{Datum}}} (PDF) (JavaScript required).
2. ↑ 2.0 2.1 Record of Nickel-Wolframtetraoxid in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 2020-01-08.
3. ↑ Hicham Oudghiri-Hassani, Fahd Al Wadaani – Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles. doi:10.3390/molecules23020273.
4. ↑ Lebukhova, N. V.; Inorganic Materials, (2006), 42(3), 310-315, CAplus
5. ↑ 5.0 5.1 5.2 A. Kuzmin, J. Purans, R. Kalendarev: Local structure and vibrational dynamics in NiWO4. In: Ferroelectrics. 258, 2001, S. 21, doi:10.1080/00150190108008653.
6. ↑ Falko P. Netzer, Alessandro Fortunelli (2016) (in German), Oxide Materials at the Two-Dimensional Limit, Springer, p. 386, ISBN 978-3-319-28332-6, Bibcode: 2016omtd.book.....N, https://books.google.com/books?id=_svtCwAAQBAJ&pg=PA386
7. ↑ J.M. Quintana-Melgoza, J. Cruz-Reyes, M. Avalos-Borja: Synthesis and characterization of NiWO4 crystals. In: Materials Letters. 47, 2001, S. 314, doi:10.1016/S0167-577X(00)00272-X.
8. ↑ 8.0 8.1 R. O. Keeling: The structure of NiWO4. In: Acta Crystallographica. 10, S. 209, doi:10.1107/S0365110X57000651.
9. ↑ Mark Ladd, Rex Palmer (2014) (in German), [[1], p. 277, at Google Books Structure Determination by X-ray Crystallography Analysis by X-rays and Neutrons], Springer Science & Business Media, p. 277, ISBN 978-1-4614-3954-7, [2], p. 277, at Google Books
10. ↑ C. Wilkinson, Μ. J. Sprague: The magnetic structures of NiWO4 and CoWO4. In: Zeitschrift für Kristallographie - Crystalline Materials. 145, 1977, doi:10.1524/zkri.1977.145.16.96.
11. ↑ Alexei Kuzmin, Aleksandr Kalinko, Robert Evarestov: First-principles LCAO study of phonons in NiWO4. In: Open Physics. 9, 2011, doi:10.2478/s11534-010-0091-z.
12. ↑ R.A. Evarestov (2013) (in German), Quantum Chemistry of Solids LCAO Treatment of Crystals and Nanostructures, Springer Science & Business Media, p. 480, ISBN 978-3-642-30356-2, https://books.google.com/books?id=3atAAAAAQBAJ&pg=PA480
13. ↑ 13.0 13.1 Nickel: sect. 1-2. Coordination compounds with neutral and inner-complex-forming ligands (Verlag Chemie, 1968), page 109. Retrieved 15 Apr 2021.
14. ↑ 14.0 14.1 Bulletin de la Société chimique de France (Société chimique de France; Masson, 1921), page 1487. Retrieved 28 Feb 2021.

* v
* t
* e

Nickel compounds

Nickel(0)|

* Ni(CO)4
* Ni(COD)2

Nickel(II)|

* NiBr2
* NiCO3
* NiCl2
* NiCrO4
* NiF2
* NiI2
* Ni(NO2)2
* Ni(NO3)2
* NiO
* Ni(OH)2
* Ni3(PO4)2
* NiS
* NiSO4
* NiTiO3
* Ni(acac)2
* xNi(NO2)6
* xNiF4
* xNiCl4
* xNiBr4
* xNiI4

Nickel(III)|

* Ni2O3
* NiOOH

Nickel(IV)|

* K2NiF6
* MNiOx

* v
* t
* e

Tungsten compounds

Tungsten(0)|

* W(CO)6

Tungsten(II)|

* WSi2
* WCl2
* W(OH)2

Tungsten(III)|

* W2O3

Tungsten(IV)|

* WC
* WO2
* WS2
* WSe2
* WTe2
* WF4
* WCl4

Tungsten(V)|

* W2O5
* WBr5
* W2Cl10

Tungsten(VI)|

* H3PW12O40
* (NH4)10(H2W12O42)
* WO2Cl2
* WCl6
* WF6
* WN2
* WO3
* WS3
* WOBr4
* WOCl4
* WOF4
* H2WO4

| Organotungsten(VI) compounds|

* W(CH3)6

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