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Polynitrides

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Polynitrides are solid chemical compounds with a large amount of nitrogen, beyond what would be expected from valencies. Some with N2 ions are termed pernitrides. Azides are not considered polynitrides, although pentazolates are.

They are formed at high pressures and mostly at high temperature.[1] But some are stable when decompressed to standard conditions. They are high energy materials, capable of exploding with high power. Some are very hard, almost as strong as diamond.[2]

List

[edit]
formula crystal space group unit cell volume density at

pressure

comment reference
LiN Cmcm a = 3.819 b = 6.471 c = 3.446 78.6 [3]
LiN2 hexagonal P63/mmc a =2.631 c = 7.615 21.2 white [3]
LiN5 P2 [3]
BeN4 triclinic P1 a=2.4062 b=3.5119 c=3.506 α=104.29° β=111.39° γ=96.71° 85 GPa [4]
BeN4 monoclinic P21/c a=3.283 b=3.276 c=4.818 β=99.67° 1 bar 1D-chain [4]
Na3N8 tetragonal I41/amd a=4.9597 c=16.29 Z=4 400.7 [5]
NaN2 tetragonal P4/mmm a=3.001 c=4.101 Z=1 36.93 [5]
Mg2N4 [6]
MgN4 triclinic P1 a=3.58 b= 3.70 c=5.01 α=94.2° β=111.2° γ=71.6° 58.7 @108 GPa >50 GPa chains [6][7]
K9N56 orthorhombic Ibam a=5.2380 b=34.560 c=23.205 Z=8 61 GPa [8]
TiN2 tetragonal I4/mcm a=4.322 c=5.269 [9]
VN2 tetragonal I4/mcm a=4.3015 c=4.9827 Z=4 92.195 5.6883 73.3 bulk modulus 347 GPa [10]
FeN2 orthorhombic Pnnm a=4.431 b=3.722 c=2.421 Z=2 39.93 58.5 [11]
FeN4 triclinic a=2.5089 b=3.524 c=3.5409 105.08 110.26 92.03 Z=1 28.09 106 [11]
CoN2 orthorhombic Pnnm 31 GPa bulk modulus 216 GPa [12]
ZnN4 orthorhombic Ibam 14-130 GPa 1D-chain [1]
YN6 100 GPa N189+ rings [13]
Y2N11 100 GPa N-double helix [13]
Y5N14 tetragonal P4/mbm a=8.451 c=4.7316 Z=2 337.93 6.296 50 [14]
RuN2 orthorhombic Pnnm [15]
RhN2 orthorhombic Pnnm bulk modulus 235 GPa [16]
PdN2 Pa3 [17]
CsN5 Pbca penazolate [18]
CsN5 triclinic P1 [18]
LaN8 trigonal R3 N18 rings [19]
LaN8 tetragonal P4/n N8 cage; high energy density [19]
Ce2N6 C2/m a=5.717 b=4.661 c=6.548 β=93.270 174.20 ambient N4 zigzags [20]
CeN4 I41/a a=6.711 c=2.879 chains [21]
CeN6 R3m a=5.890 c=4.108 hexazine [21]
CeN14 hexagonal P6mm a =5.748 c =2.447 sheet [21]
CeN17 hexagonal P6mm a=6.111 c=2.842 sheet [21]
ReN2 monoclinic P21/c a=3.625 b=6.407 c=4.948 β=111.48° 0 hard; bulk modulus 330 GPa; N24− & N3− [22]
OsN2 orthorhombic Pnnm bulk modulus 358 GPa [2]
IrN2 monoclinic P21/c bulk modulus 428 GPa [23][2]
PtN2 Pa3 bulk modulus 372 GPa [24]

References

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