Nitridosilicate
The nitridosilicates are chemical compounds that have anions with
Related compounds include pnictogenidosilicates :phosphidosilicates, arsenidosilicates and antimonosilicates; pnictogenidogernamates: phosphidogermanates. By replacing silicon, there are also nitridogermanates, nitridostannates, nitridotantalates and nitridotitanates.
Use
Nitridosilicates are used as host substances for
Production
Nitridosilicates can be made in a
Properties
The ratio of silicon to nitrogen varies from 1:4 to 7:10 (0.25 to 0.7) with increased condensation, and fewer sites for metals with high silicon content. At a ratio of 3:4 (0.75) there is no longer capacity for metal, as that is silicon nitride.[5] The more condensed substances, with lower nitrogen content, have greater number of silicon atoms surrounding the nitrogen. This coordination number can vary from one to four, with the most common being three. The silicon atom always is coordinated by four nitrogen atoms. In the silicates, silicon is surrounded by four oxygen atoms, but each oxygen is only connected to one or two silicon atoms, and only very rarely three. So nitridosilicates can form more diverse structures than the silicates.[6]
Nitridosilicates with higher proportion of silicon (more condensed) are more resistant to attack by water and oxygen, and so can be exposed to the atmosphere without decomposition.[6] These condensed nitridosilicates are mechanically strong, and resistant to heat, acids and alkalis.[1]
SiN4 tetrahedra can be connected to each other via vertices or edges. This differs from SiO4 which only connects via vertices.[1]
Use
Nitridosilicates have been used to make
Nitridosilicates
name | formula | formula
weight |
crystal
system |
space
group |
unit cell | volume | density | comments | ref |
---|---|---|---|---|---|---|---|---|---|
LiSi2N3 | [5] | ||||||||
Li2SiN2 | [7] | ||||||||
Li5SiN3 | [7] | ||||||||
Li8SiN4 | [8] | ||||||||
Li18Si3N10 | [7] | ||||||||
Li21Si3N11 | I4 | a=9.4584 c=9.5194 | antifluorite structure | [7] | |||||
BeSiN2 | [9] | ||||||||
MgSiN2 | [5] | ||||||||
NaSi2N3 | [9] | ||||||||
Ca2Si5N8 | 332.64 | monoclinic | Cc | a = 14.3280 b = 5.61165 c = 9.69406 β = 112.1484 Z=4 | 721.92 | 3.06 | Eu orange fluorescence | [5][10][4] | |
CaSiN2 | [5] | ||||||||
Ca3SiN3H | monoclinic | C2/c | a = 5.236 b = 10.461 c = 16.389 β = 91.182° Z = 8 | semiconductor: band gap 3.1 eV | [11] | ||||
Ca4SiN4 | [5] | ||||||||
Ca5Si2N6 | [5] | ||||||||
Ca12Si4[SiN4] | triclinic | P1 | a 9.0103 b 9.0218 c 13.8252 α 71.053° β 82.738° γ 69.763° | black | [12] | ||||
Ca16Si17N34 | [5] | ||||||||
CaMg3SiN4 | I41/a | [13] | |||||||
Ca5[Si2Al2N8] | orthorhombic | Pbcn | a = 9.255 b = 6.140 c = 15.578 | [14] | |||||
LiCa3Si2N5 | monoclinic | C2/c | a = 5.145 b = 20.380 c = 10.357 β = 91.24° | [15] | |||||
Li4Ca3Si2N6 | 288.24 | monoclinic | C2/m | a=5.787 b=9.705 c=5.977 β=90.45 | 335.7 | 2.852 | [5][16] | ||
Li2CaSi2N4 | [5] | ||||||||
Li2Ca2Mg2Si2N6 | [5] | ||||||||
Li2Ca3MgSi2N6 | [5] | ||||||||
CaMg3SiN4 | I41/a | a = 11.424 c = 13.445 Z=16 | [9] | ||||||
CaAlSiN3 | orthorhombic | Cmc21 | Eu yellow fluorescence | [17] | |||||
CaAlSi4N7 | orthorhombic | Pna21 | a = 11.6819, b = 21.0193, c = 4.9177 Å | [18] | |||||
Ca4AlSiN5 | orthorhombic | Pna21 | a 11.2058 b 9.0512 c 6.0203 | faint red | [12] | ||||
Ca5Al2Si2N8 | orthorhombic | Pbca | a= 9.255 b = 6.140 c = 15.578 Z=4 | 885.2 | 3.171 | yellow | [9][19] | ||
CaScSi4N7 | [5] | ||||||||
Manganese silicide dinitride | MnSiN2 | orthorhombic | Pna21 | a = 5.271, b = 6.521, and c = 5.0706 V=174.26 | intense red | [8] | |||
Fe2Si5N8 | 364.23 | monoclinic | Cc | a= 14.0408 b = 5.32635 c = 9.5913 β = 110.728 Z=4 | decompose 1370K; brown | [10] | |||
ZnSiN2 | [9] | ||||||||
SrSiN2 | [5] | ||||||||
Sr2Si5N8 | orthorhombic | Pmn21 | a = 5.71006 b = 6.81914 c = 9.33599 Z=2 | 363.52 | 3.908 | Eu red fluorescence | [5][4][20] | ||
SrSi6N8 | [5] | ||||||||
SrSi7N10 | [18] | ||||||||
Sr5Si7P2N16 | 920.83 | Pnma | a=5.6748 b=28.0367 c=9.5280 Z=4 | 1522.1 | 4.018 | [21] | |||
SrAlSi4N7 | orthorhombic | Pna21 | a = 11.742 b = 21.391 c = 4.966 Z = 8 | 1247.2 | [22] | ||||
Li2SrSi2N4 | cubic | a=10.69 Z=12 | 1220 | [5][23] | |||||
Li4Sr3Si2N6 | monoclinic | C2/m | a = 6.127, b = 9.687, c = 6.220, β = 90.24° Z=2 | 369.1 | 3.876 | [16] | |||
SrBeSi2N4 | p62c | a=4.86082 c=9.42264 Z=2 | [24] | ||||||
SrMg3SiN4 | I41/a | a = 11.495 c = 13.512 Z=16 | [9][13] | ||||||
Sr8Mg7Si9N22 | Cm | a 15.280 b 7.4691 c 10.936 β 110.462° | [25] | ||||||
SrAlSiN3 | Cmc21 | [17] | |||||||
SrAlSi4N7 | Pna21 | [18] | |||||||
SrScSi4N7 | [5] | ||||||||
YScSi4N6C | hexagonal | P63mc | a=5.9109 c=9.677 | [26] | |||||
CaYSi4N7 | [5] | ||||||||
SrYSi4N7 | [5] | ||||||||
Ca8In2SiN4 | orthorhombic | Ibam | a = 12.904 b = 9.688 c = 10.899 Z = 4 | metallic | [11] | ||||
BaSiN2 | [5] | ||||||||
Ba5Si2N6 | [9] | ||||||||
Ba2Si5N8 | orthorhombic | Pmn21 | Eu red fluorescence | [5][4] | |||||
BaSi6N8 | Imm2 | a = 7.9316, b = 9.3437, c = 4.8357, Z = 2 | 358.38 | [5][27] | |||||
BaSi7N10 | monoclinic | a = 6.8729, b = 6.7129, c = 9.6328, β = 106.269, Z = 2 | most condensed | [5][28] | |||||
Ba6Si6N10O2(CN2) | P6 | a = 16.255, c = 5.469, Z = 3 | yellow, grown in liquid sodium | [29] | |||||
BaMg3SiN4 | P1 | a = 3.451 b = 6.069 c = 6.101 α = 85.200 β = 73.697 γ = 73.566° Z=1 | [30] | ||||||
Ba2AlSi5N9 | triclinic | P1 | a = 9.860 b = 10.320 c = 10.346 α = 90.37° β = 118.43° γ = 103.69° Z = 4 | [31] | |||||
Ba5Si11Al7N25 | Pnnm | a = 9.5923, b = 21.3991, c = 5.8889 Å Z = 2 | with Eu yellow emission | [32] | |||||
BaSi4Al3N9 | P21/C | a = 5.8465, b = 26.726, c = 5.8386 Å, β = 118.897° and Z = 4 | with Eu blue emission | [32] | |||||
BaScSi4N7 | [5] | ||||||||
BaYSi4N7 | [5] | ||||||||
LaSi3N5 | [5] | ||||||||
La3Si6N11 | [5] | ||||||||
La5Si3N9 | [9] | ||||||||
La7Si6N15 | [9] | ||||||||
Li5La5Si4N12 | tetragonal | P4b2 | a = 11.043 c = 5.573 Z = 2 | [33] | |||||
calcium lanthanum nitridosilicate | CaLaSiN3 | Ca can be substituted by Yb or Eu | [34] | ||||||
CaLaSi4N7 | [5] | ||||||||
CeSi3N5 | [9] | ||||||||
Ce3Si6N11 | [9] | ||||||||
Ce3Si5N9 | [9] | ||||||||
Ce7Si6N15 | triclinic | [9] | |||||||
Ce7Si6N15 | trigonal | [9] | |||||||
Li5Ce5Si4N12 | tetragonal | P4b2 | a = 10.978 c = 5.514 Z = 2 | [33] | |||||
Pr3Si6N11 | [9] | ||||||||
Pr5Si3N9 | [9] | ||||||||
Pr7Si6N15 | [9] | ||||||||
Ba2Nd7Si11N23 | dark blue | [35] | |||||||
Sm3Si6M11 | [9] | ||||||||
Ca3Sm3[Si9N17] | cubic | P4_3m | a=7.3950; Z=1 | 404.4 | [36] | ||||
Eu2SiN3 | Cmca | a = 5.42, b = 10.610, c = 11.629, Z = 8 | [9][37] | ||||||
dieuropium penta siliconoctanitride | Eu2Si5N8 | orthorhombic | Pnm21 | a=5.7094 b=6.8207 c=9.3291 Z=2 | 363.29 | 5.087 | red | [9][38] | |
EuMg3SiN4 | I41/a | a = 11.511 c = 13.552 Z=16 | [13] | ||||||
Ca3Yb3[Si9N17] | cubic | P4_3m | a=730.20 Z=1 | 389.3 | [36] | ||||
BaYbSi4N7 | includes NSi4 clusters | [9][39] | |||||||
europium ytterbium tetrasiliconheptanitride | EuYbSi4N7 | hexagonal | P63mc | a=5.9822 c=9.7455 | 302.03 | 5.887 | brown | [9][38] | |
SrYbSi4N7 | [9] | ||||||||
EuYbSi4N7 | [9] | ||||||||
CaLuSi4N7 | [5] | ||||||||
SrLuSi4N7 | [5] | ||||||||
BaLuSi4N7 | [5] | ||||||||
Pb2Si5N8 | 666.90 | orthorhombic | Pmn21 | a = 5.774 b = 6.837 c = 9.350 | 269.11 | 6.001 | Pb-Pb dumbells | [20] |
References
- ^ a b c Philipp Bielec (27 July 2019). The Ion Exchange Approach - Expanding Elemental Variety in Nitridosilicate Chemistry (PDF) (Thesis).
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