Borosilicide
Boride silicides (also called borosilicides)[1] are mixed anion compounds containing silicide and boride linked into anions.[2]
Synthesis
[edit]Boride silicides may be produced by melting together the elements in a boron nitride crucible, sealed in tantalum. Tin may be used as a solvent.[3] Alkali metal iodides can also be used as a solvent.[4]
Use
[edit]Borosilicides are of interest in research for ultra-high temperature materials for use in jet engines, catalysts and also for thermoelectric materials.[4]
Structure
[edit]There are not many different structures for borosilicides, particularly compared to the boride carbides. Most known compounds are rich in boron, but a few are rich in silicon.[5] The boron and silicon atoms do not appear as isolated ions, but are covalently bound into a network. Boron networks found in metal borides are enlarged by the addition of silicon, which allows inclusion of metal atoms that are larger than would otherwise be stable.[6]
Transition elements can form a tetragonal M5SiB2 series of compounds. These are called MAB phases (M for metal, A here is silicon, and B is boron).[7] However the compounds for zirconium and hafnium are energetically unfavourable.[8]
List
[edit]| formula | system | space group | unit cell Å, | volume | density | comment | ref |
|---|---|---|---|---|---|---|---|
| α-SiB3 | rhombohedral | band gap 0.2 eV; ignites 600 °C | [9] | ||||
| β-SiB3
(Si4B11.6C0.4) |
orthorhombic | Imma | a = 8.3915 b = 12.5680 c = 6.2134 Z = 16 | 655.29 | 2.454 | transluscent and amber; Si4 chain and B12 cluster; band gap 2.0 eV; acid and base resistant; stands hot oxygen | [9] |
| LiBSi2 | tetragonal | P42/nmc | a=6.83225, c=8.83924 Z=8 | seven, six and five-membered rings; dark gray; moisture and acid stable; band gap 1.1 eV | [10] | ||
| Li2B12Si2 | orthorhombic | Cmce | a=6.1060 b=10.979 c=8.4050 Z=4 | transparent yellow; Vickers hardness=20.3 GPa; band gap 2.27 eV | [3] | ||
| Na2B6Si2 | trigonal | R3m | a = 5.0735 c = 16.0004 Z=3 | 356.3 | closo [B6]2− (Si2)0 | [11] | |
| Na8B4.1Si41.9 | cubic | I43m | a=9.699 V=906.87 | [12][13] | |||
| Na8B74.5Si17.5 | hexagonal | P63/mmc | a = 10.2392 c = 10.9215 Z=1 | 991.62 | 2.480 | black; Na8(B12)6Si16[BSi]1.5[B2]0.5. B12 | [14][15] |
| MgB12Si2 | orthorhombic | Pnma | a=10.980 b=6.1098 c=8.3646 Z=4 | yellow-green; B12 icosahedra linked by Si | [16] | ||
| Mg3B36Si9C | trigonal | R3m | a=10.079 c=16.372 | black; acid stable; Vickers hardness 17.0 GPa | [17] | ||
| Na3MgB37Si9 | trigonal | R3m | a = 10.1630 c = 16.5742 Z=3 | 1482.5 | [18] | ||
| K7B7Si39 | cubic | Pm3n | a=9.952 | clathrate | [19][20] | ||
| ScB12.0C0.65Si0.071 | cubic | F43m | a=20.3085 | [9][21] | |||
| V5SiB2 | tetragonal | I4/mcm | a=5.810 c=10.790 | [22] | |||
| CrSi3(B12)Se12(B2Se3)1.33 | hexagonal | P6322 | a=12.9772 c=9.532 Z=2 | 1390.2 | black | [9][23] | |
| Mn5SiB2 | tetragonal | I4/mcm | a=5.619 c=10.458 | 330.17 | [4] | ||
| CrMn4SiB2 | tetragonal | I4/mcm | a=5.6064 c=10.4244 | 327.6 | 6.517 | ferromagnetic Curie T=270 K | [24] |
| Fe5SiB2 | tetragonal | I4/mcm | a=5.555 c=10.342 | 319.17 | [4] | ||
| Co4.75Si2B | tetragonal | I4/mcm | a=8.648 c=4.265 | 318.9 | [4] | ||
| Ni6Si2B | hexagonal | P62m | a=6.111 c=2.884 | 93.252 | [4] | ||
| Rb8B8Si38 | cubic | Pm3n | a = 9.9583 V=987.69 Z=1 | 3.0902 | air and water stable; semiconductor; | [14] | |
| YB17.6Si4.6 | rhombohedral | R3m | a=10.0841 c=16.4714 | [25] | |||
| YB41Si1.2 | orthorhombic | Pbam | a=16.674 b=17.667 c=9.5110 | [26] | |||
| Y1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.080 c=16.426 Z=9 | [27] | |||
| YB44Si2 | orthorhombic | Pbam | a=16.674 b=17.667 c=9.511 | 2801.7 | [6] | ||
| Y2.04(B12)3(CSi)Si8 | trigonal | R3m | [28] | ||||
| Y5Si2B8 | tetragonal | P4/mbm | Z=2 | [29] | |||
| Y2B36Si9C | trigonal | R3m | a=10.0344 c=16.348 | [17] | |||
| Nb5SiB2 | tetragonal | I4/mcm | a=6.569 c=11.878 Z=4 | Superconductor Tc=7 K; for Nb5Si2.4B0.6 7.8K | [30][31] | ||
| Nb4VSiB2 | tetragonal | I4/mcm | [32] | ||||
| Nb4CrSiB2 | tetragonal | I4/mcm | a = 6.109 c = 11.547 | [33] | |||
| Mo5SiB2 | tetragonal | I4/mcm | a=6.0272 c=11.0671 Z=4 | oxidises to borosilicate; Superconductor Tc=5.6 K | [34][35][36] | ||
| Mo4VSiB2 | tetragonal | I4/mcm | a= 5.9669 c= 11.02129 | [32] | |||
| Mo4MnSiB2 | tetragonal | I4/mcm | a = 5.938 c = 11.057 | [24] | |||
| Ti4MoSiB2 | tetragonal | I4/mcm | a= 6.13262 c= 11.52567 | band gap 4.1 eV | [37] | ||
| Mo4CrSiB2 | tetragonal | I4/mcm | a = 5.939 c = 11.016 | [33] | |||
| Cs8B8Si38 | cubic | Pm3n | a=10.0312 Z=1 | 1009.39 | 3.647 | formed under pressure; semiconductor; 3D network of dodecahedra and 14-hedra enclosing Cs ions | [38] |
| CeSi1·5B0.5 | hexagonal | P6/mmm | a = 3.9922 c = 4.3053 | [39] | |||
| GdB18Si5 | tetragonal | P4/mbm | a=7.2665 c=8.2229 | [40][41] | |||
| GdB44Si2 | [42] | ||||||
| Gd2B36Si9C | trigonal | R3m | a=10.0955 c=16.454 | [17] | |||
| Gd5Si2B8 | tetragonal | P4/mbm | a=7.2665 c=8.2229 | metallic | [43][44] | ||
| Gd5Si3B0.6 | hexagonal | P63/mcm | a=8.5080 c=6.4141 | [2][44] | |||
| Gd5Si23B8 | B6 octahedra and Si2 | [2] | |||||
| Gd1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.069 c=16.447 Z=9 | [27] | |||
| Sm5Si2B8 | tetragonal | P4/mbm | a=7.2616 c=8.2660 Z=2 | [29] | |||
| TbB41Si1.2 | orthorhombic | Pbam | ferromagnetic < 18 K; B12Si3 and B12 polyhedra | [45] | |||
| Tb9B3Si13.83 | R32 | a = 6.668 c = 12.405 Z=1 | [46] | ||||
| Tb3-xC2Si8(B12)3 | [47] | ||||||
| Tb1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a =10.075 b =10.075 c =16.41 Z=9 | [27] | |||
| TbB44Si2 | orthorhombic | Pbam | a=16.651 b=17.661 c=9.500 | 2793.7 | [6] | ||
| Tb1.8C2Si8(B12)3 | rhombohedral | R3m | a=10.1171 c=16.397 Z=3 | 1453.4 | band gap 0.9 eV | [48] | |
| Tb2B36Si9C | trigonal | R3m | a=10.0307 c=16.352 | [17] | |||
| Tb5Si2B8 | tetragonal | P4/mbm | a=7.2616 c=8.2660 Z=2 | [29] | |||
| Dy0.7B12.33Si3 | trigonal | R3m | a=10.0782 c=16.4651 Z=9 | 1448.3 | black | [49] | |
| Dy1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.058 c=16.412 Z=9 | [27] | |||
| DyB44Si2 | orthorhombic | Pbam | a=16.658 b=17.655 c=9.508( | 2796.3 | [6] | ||
| Dy2B36Si9C | trigonal | R3m | a=10.0735 c=16.323 | [17] | |||
| Dy2.1(B12)3(CSi)Si8 | trigonal | R3m | [28] | ||||
| Dy5Si2B8 | tetragonal | P4/mbm | Z=2 | [29] | |||
| Ho1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.062 c=16.365 Z=9 | [27] | |||
| HoB44Si2 | orthorhombic | Pbam | a=16.608 b=17.578 c=9.492 | 2771.1 | [6] | ||
| Ho5Si2B8 | tetragonal | P4/mbm | a=7.1830 c=8.9900 Z=2 | [29] | |||
| Ho2B36Si9C | trigonal | R3m | a=10.0643 c=16.2699 | [17] | |||
| Er1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.047 c=16.393 Z=9 | [27] | |||
| ErB44Si2 | orthorhombic | Pbam | a=16.600 b=17.621 c=9.485(5) | 2774.4 | [6] | ||
| Er2B36Si9C | trigonal | R3m | a=10.016 c=16.309 | [17] | |||
| Er3Si3.83 B (Er18Si23B6) | trigonal | R32 | a = 6.5568 c = 24.5541 Z = 6 | 914.19 | 6.82 | shiny grey | [5] |
| Er8B3Si17 | orthorhombic | Cmc21 | a=4.0128b=28.867 c=3.8413 Z=1 | [50] | |||
| Tm1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.068 c=16.350 Z=9 | [27] | |||
| TmB44Si2 | orthorhombic | Pbam | a=16.655 b=17.667 c=9.494 | 2793.6 | [6] | ||
| Tm2B36Si9C | trigonal | R3m | a=10.0156 c=16.296 | [17] | |||
| Yb1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.095 c=16.470 Z=9 | [27] | |||
| YbB44Si2 | orthorhombic | Pbam | a=16.636 b=17.644 c=9.488 | 2785.0 | [6] | ||
| YbB45.6Si1.0 | orthorhombic | a=16.636 b=17.644 c=9.488 | [51] | ||||
| YbB3Si13.83 | R32 | a = 6.5796 c = 12.2599 Z=1 | [46] | ||||
| Yb2B36Si9C | trigonal | R3m | a=10.1103 c=16.314 | [17] | |||
| Lu1−xB12Si3.3−δ (0⩽x⩽0.5, δ≈0.3) | rhombohedral | R3m | a=10.062 c=16.297 Z=9 | [27] | |||
| Hf5Si3B0.2 | hexagonal | P63/mcm | a = 7.8557 c = 5.52622 Z=2 | Ultra-high temperature ceramic | [52] | ||
| W5SiB2 | tetragonal | I4/mcm | Superconductor Tc = 5.8 K | [30][53] | |||
| W4CrSiB2 | tetragonal | I4/mcm | a = b: 5.942 c = 10.948 | [33] | |||
| W4.5Ta0.5SiB2 | tetragonal | I4/mcm | Superconductor Tc=6.5 K | [30] |
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