Calcium nitride
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| Calcium nitride | |
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Calcium nitride |
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Other names
tricalcium dinitride |
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| Identifiers | |
| CAS number | 12013-82-0 |
| PubChem | 3387080 |
| EC number | 234-592-9 |
| Properties | |
| Molecular formula | Ca3N2 |
| Molar mass | 148.25 g mol−1 |
| Appearance | red-brown crystalline solid |
| Density | 2.670 g/cm3 2.63 g/cm3 (17 °C) |
| Melting point |
1195 °C, 1468 K, 2183 °F |
| Solubility in water | decomposes |
| Structure | |
| Crystal structure | Cubic, cI80 |
| Space group | Ia-3, No. 206 |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen. Its chemical formula is Ca3N2.[1] α-Calcium nitride is the commonly encountered form. It has an anti-bixbyite structure similar to Mn2O3, except that the positions of the ions are reversed: calcium (Ca2+) take the oxide (O2−) positions and nitride ions (N3−) the manganese (Mn3+).
Calcium nitride is formed along with the oxide, CaO, when calcium burns in air. It can be produced by direct reaction of the elements:
- 3 Ca + N2 → Ca3N2
It reacts with moisture in air to give ammonia and calcium hydroxide:
- Ca3N2 + 6 H2O → 3 Ca(OH)2 + 2 NH3
This reaction also occurs in water.[2]
It absorbs hydrogen above 350 °C:
- Ca3N2 + 2 H2 → 2 CaNH + CaH2
General references
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 0080379419 [Amazon-US | Amazon-UK].
Footnotes
- ^ Mary Eagleson (1994). Concise Encyclopedia Chemistry. Walter de Gruyter. ISBN 3-11-011451-8 [Amazon-US | Amazon-UK].
- ^ Heyns, A (1998). "The Vibrational Spectra and Decomposition ofα-Calcium Nitride (α-Ca3N2) and Magnesium Nitride (Mg3N2)". Journal of Solid State Chemistry 137: 33. doi:10.1006/jssc.1997.7672.
