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|Molar mass||148.25 g mol−1|
|Appearance||red-brown crystalline solid|
2.63 g/cm3 (17 °C)
1195 °C, 1468 K, 2183 °F
|Solubility in water||decomposes|
|Crystal structure||Cubic, cI80|
|Space group||Ia-3, No. 206|
(what is: /?)|
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen. Its chemical formula is Ca3N2. 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
- Ca3N2 + 6 H2O → 3 Ca(OH)2 + 2 NH3
It absorbs hydrogen above 350 °C:
- Ca3N2 + 2 H2 → 2 CaNH + CaH2
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 0080379419 [Amazon-US | Amazon-UK].
- 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.