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| Nickel(II) oxide | |
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| General | |
| Other names | nickelous oxide nickel monoxide |
| Molecular formula | NiO |
| Molar mass | 74.69 g/mol |
| Appearance | green crystalline solid |
| CAS number | [1313-99-1] |
| Properties | |
| Density and phase | 6.67 g/cm3, solid |
| Solubility in water | negligible |
| Melting point | 1984°C |
| Boiling point | ? |
| Hazards | |
| MSDS | ScienceLab.com |
| EU classification | not listed |
| NFPA 704 |
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| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Nickel(II) oxide is the chemical compound with the formula NiO. It is notable as being the only well characterised oxide of nickel although there have been many reports of others (nickel(III) oxide, Ni2O3, and nickel dioxide, NiO2).[1]
The mineralogical form of NiO, bunsenite, is very rare. It was suspected for causing green colour of chrysoprase, but later it was rejected.
Preparation and properties
The best method of preparation is through pyrolysis of a nickel(II) compounds such as Ni(OH)2, Ni(NO3)2, and NiCO3, which yield a light green powder.[1]Synthesis from the elements by heating the metal in oxygen can yield grey to black powders which may indicate nonstoichiometry.[1] NiO is a basic oxide.[1]
Structure
NiO adopts the NaCl structure, with octahedral Ni(II) and O2− sites. Like many other binary metal oxides, NiO is often nonstoichiometric, meaning that the Ni:O ratio deviates from 1:1.
References
- ^ a b c d Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
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