Nickel(II) oxide
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| Nickel(II) oxide | |
|---|---|
| Image:Nickel(II) oxide.jpg | |
| 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 | |
| EU classification | not listed |
| NFPA 704 |   
|
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
Nickel(II) oxide is the chemical compound with the formula NiO. This species adopts the NaCl structure, with octahedral Ni(II) and O2- sites. It is formed by the pyrolysis of a variety of nickel(II) compounds such as Ni(OH)2, Ni(NO3)2, and NiCO3. Like many other binary metal oxides, NiO is often nonstoichiometric, meaning that the Ni:O ratio deviates from 1:1.
Other nickel oxides are Ni2O3 and NiCO2.
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