A hydridonitride (nitridohydride, nitride hydride, or hydride nitride) is a chemical compound that contains hydride and nitride ions in a single phase. These inorganic compounds are distinct from inorganic amides and imides as the hydrogen does not share a bond with nitrogen, and contain a larger proportion of metals.


The hydride ion H is stabilised by being surrounded by electropositive elements such as alkalis or alkaline earths.[1] Quaternary compounds exist where nitrogen forms a complex with bonds to a transition or main group element. The hydride requires the presence of another alkaline earth element.[1]


Hydridonitrides may be produced by a process called self-propagating high-temperature synthesis (SHS) where a metal nitride is ignited in a hydrogen atmosphere.[2]

A metal (Ti, Zr, Hf, Y) can also be ignited in an atmosphere mixing hydrogen and nitrogen, and a hydridonitride is formed exothermicly.[3]

The molten metal flux technique involves dissolving metal nitrides and hydrides in an excess of molten alkaline earth metal, by heating till everything is molten, and then cooling until crystals form, but the metal is still liquid. Draining the liquid metal (and centrifuging) leaves the crystals of hydridonitride behind. A eutectic molten metal allows it to be cooled more.[1]

If liquid alkali metal is used as a flux to grow a hydridonitride crystal, excess metal can be removed using liquid ammonia.[4]


Some hydridonitride are sensitive to water vapour in air.[5] For non-stoichimetric compounds, as the proportion of hydrogen increases, the unit cell dimensions also increase, so hydrogen is not merely filling holes.[6] When heated to a sufficiently high temperature, hydridonitrides lose hydrogen first to form a metallic nitride or alloy.[7]


name formula system space group unit cell

(lengths in Å, volume in Å3)

structure comment optical reference
lithium nitride hydride
lithium hydridonitride
Li4NH tetrahedral I41/a a = 4.9865, c = 9.877, V = 234.9, Z = 4 yellow [4]
calcium hydridonitride Ca2NH cubic Fd3m a = 10.13, Z = 16 brown-black [5]
strontium hydridonitride Sr2NH R3m a = 3.870, c = 18.958 orange-yellow or black [8]
barium hydridonitride Ba2NH hexagonal R3m a = 4.0262, c = 20.469 pure H conductor [9]
Titanium hydridonitride TiN0.3H1.1 [6]
Ti0.6Nb0.4N0.4H1.1 [6]
zirconium hydridonitride ZrN0.17H1.65 [2]
Ti0.88Zr0.12N0.28H1.39 [6]
Zr0.7Nb0.3N0.33H1.15 [6]
Ti0.7V0.3N0.23H0.8 [6]
Tribarium chromium trinitride hydride Ba3CrN3H hexagonal P63/m a = 8.0270, c = 5.6240, Z = 2 V=313.83 planar CrN35–, octahedral HBa611+ nonmagnetic insulator green [10]
Hafnium hydridonitride HfNH0.6 hcp a = 3.241, c = 5.198 [7]
Hafnium hydridonitride HfNH hcp a = 3.216, c = 5.259 [7]
Thorium nitride hydride ThNH2 fcc a = 5.596 [11]
Lithium distrontium dihydride nitride LiSr2H2N orthorhombic Pnma a = 7.4714, b = 3.7028, c = 13.2986, Z = 4 [SrH5N2]9−, [SrH4N3]11−, [LiH3N]5− [12]
hexacalcium dichromium hexanitride hydride Ca6Cr2N6H R3 a = 9.0042, c = 9.1898, Z = 3 planar CrN36−, CrN35−, octahedral Ca6H11+ [1][13]
Ba3CrN3H hexagonal P63/m a = 8.0270, c = 5.6240, Z = 2 planar CrN35−; octahedral Ba6H11+ [14][1]
tricalcium silicon trinitride hydride Ca3SiN3H monoclinic C2/c a = 5.236, b = 10.461, c = 16.389, β = 91.182°, Z = 8 SiN4 tetrahedra in chains, Ca6H octahedra [1][15]
Lithium dieuropium nitride trihydride LiEu2NH3 orthorhombic Pnma a = 7.4213, b = 3.6726, c = 13.1281, Z = 4 [Eu3+H7N2]10– and [Eu2+H6N3]13– ruby red [16]


  1. ^ a b c d e f Falb, Nathaniel W.; Neu, Jennifer N.; Besara, Tiglet; Whalen, Jeffrey B.; Singh, David J.; Siegrist, Theo (14 February 2019). "Ba3CrN3H: A New Nitride-Hydride with Trigonal Planar Cr". Inorganic Chemistry. 58 (5): 3302–3307. doi:10.1021/acs.inorgchem.8b03367. PMID 30762348. S2CID 73438467.
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