Boride carbide

Boride carbides, borocarbides or carboborides are chemical compounds composed of metal along with boride and carbide anions. They are mostly metallic in nature, strong, resistant to heat, and some are superconductors.

Boride carbides form crystalline ceramics of a wide range of composition. They have been called "a toy box for solid state physicists".[1]

Four structure classes exist based on the dimensionality of the carbon-boron structure. One category has metal atoms embedded in a 3D-net of boron-carbon. Also there are those with a two-dimensional network of boron and carbon, alternating with sheets of metal atoms. Thirdly are those with a one-dimensional boron-carbon structure embedded in channels in the metal. Lastly there are zero-dimensional molecular-like carbon-boron structures embedded in holes in the metal.[2] Substances with B2C2 can be termed diborodicarbides.[3] An example series of 2D materials is (RC)m(Ni2B2)n with R a rare earth, has layers of RC alongside NiB layers.[4]

In the zero-dimensional case, dicarbidoborate [BC2]5− or CBC5− or CBC7− can exist isoelectronic with azides and cyanates.[5] Other finite chain structures exist like [BC3]5− [B2C2]6− [B2C4]6− [B3C3]7− [B4C4]8− [B4C7]8− [B5C8]9− [B5C5]9− (C2−=B−=C=B−=B−=C=B−=C=B−=C2−) [B5C6]9−[6]

Additional carbon ions may be in the form of C4− [C2]2− [C2]4− [C2]6− or [C3]4−[6] Carbidonitridoborate CBN4− also can be made if nitrogen is present. As of 2024, [OBC]3− or [NCB]4− have not been discovered.[5]

Boride carbides are formed by melting together elements, or carbides and borides.[4]

Hydrogen can be absorbed without changing the structure as in YNi2B2CH0.2.[4] Some compounds also contain halogens, which are not bound to carbon or boron, being found as independent ions.

Due to their extremely high melting point and ability to retain strength when heated, boride carbides are under investigation for use in ultra-high temperature applications, such as in supersonic vehicles.[7] The 3D varieties are under consideration as high temperature superconductors.[8] Some of these compounds are under investigation for thermoelectric applications.[9]

List

formula space group unit cell remarks ref
LiBC [10]
LiBC3 P6m2 a = 2.4588 c = 6.770 metallic grey [10][11]
LiB2C2 P63/mmc a = 2.5930 c = 22.680 [10]
t-LiB2C2 P4m2 a=4.1389 c=7.1055 Z=2 [12]
o-LiB13C2 Imma a = 5.668 b = 10.820 c = 8.040 colourless; acid stable; B122− and CBC+; band gap 3.32 eV [13]
r-Li~1B13C2 R3m a = 5.6535 c = 12.5320 transparent [14]
Li2B2C [10]
Li2B12C2 Amm2 a = 4.706 b = 9.010 c = 5.65 Z = 2 pale greenish yellow; acid stable; B122− and C2 [13][10]
BeB2C2 Pmmn a=6.13425 b=5.4220 c=4.6928 [15]
NaB5C Pm3m a = 4.0925 Z=1 density=2.16 black; air sensitive [16][17]
NaB13C2 Imma a = 10.9417 b = 5.6756 c = 8.0898 reddish black metallic [18]
MgB2C2 Cmca a = 10.922 b = 9.461 c = 7.459 red transparent; brittle; layers ∞2 [BC]− [19]
MgB2C2 Pnnm a = 7.19633 b = 4.6179 c = 2.77714 [20]
MgB12C2 C2/c a=7.274 b=8.777 c=7.282 β=105.33° Z=4 B12 and C [13][21]
MgB12C2 Imma a=5.613 b=9.828 c=7.933 Z=4 B12 and C2 [21]
Mg1.42B25C4 P21/c а = 9.626 b = 11.329 c = 8.966 β = 105.80° V = 940.8 Å3 density=2.505 g/cm3 [22]
MgB50C8 [13]
Mg3B50C8 C2/m a = 8.938 b = 5.6514 c = 9.602 β = 105.86° Z = 1 (B12)4(CBC)2(C2)2 Dicarbidoborate [23]
AlB40C4 [24]
Al2B51C8 diamond like [25]
Al3BC hexagonal a=3.491 c=11.541 [26]
Al3BC3 P3c1 a=5.900 c=15.900 V=479.0 Z=6 light-yellow transparent; water stable; dissolve in HF or HNO3; CBC + AlC3 layers; density=2.66 [25]
Al3B48C2 diamond-like [25]
Mg3B36Si9C R3m a=10.079 c=16.372 black; acid stable; Vickers hardness 17.0 GPa [27]
LiB12PC Imma a=10.188 b=5.7689 c=8.127 Z=4 colourless [28]
LiB12P0.89C1.11 brown [28]
LiB12P1.13C0.87 Imma a=10.410 b=5.9029 c=8.204 red [28]
KB5C Pm3m a=4.1281 Z=1 black; air sensitive [17]
CaB2C2 I4/mcm a = 5.3733 c = 7.4155 Z = 4 8 and 4 member rings of BC in sheets; [29][30]
CaB2C4 P6/mmm a = 4.55971 c = 4.4020 [31]
CaB2C6 P6/mmm a = 2.58390 c = 4.43597 [31]
Ca5Cl3(C2)(CBC) Cmcm a=3.8924 b =13.891 c=18.59 V=1005.2 orange-brown transparent; water sensitive; CC and CBC [32]
Ca3Cl2CBN Pnma carbidonitridoborate CBN4− [32]
Ca15(CBN)6(C2)2F2 Ia3d a=16.5364 dark red; decompose in moist air; carbidonitridoborate CBN4− [33]
Ca15(CBN)6(C2)2O carbidonitridoborate CBN4− [33]
Ca3(CBN)Br2 carbidonitridoborate CBN4− [33]
Ca9Cl8(BC2)2 Cmcm a = 11.6291 b = 13.416 c = 12.0862 Z = 4 pale red transparent; sensitive to dampness; [34]
ScB2C P42/mbc a=6.651 c=6.763 V=299.1 density 3.502; 2D net of seven and four-membered rings [35]
ScBC2 0-D BC2 [2]
ScB2C2 Pbam a = 5.175 b = 10.075 c = 3.440 tough, water resistant, melts over 2500 °C [36][37]
ScB3C3 Pm3n a = 4.609 clathrate; metallic; air sensitive [38]
ScB17C0.25 P6/mmm a=14.550 c=8.4543 [39]
Sc2BC2 I4/mmm a=3.3259 c=10.674 Z=2 [40]
Sc2B1.1C3.2 P3m1 a=3.3991 c=6.7140 or a=23.710 c=6.703 [B1/3C2/3]∞ with Sc-C-Sc layers [41][42]
Sc3B5C3 tetragonal a=3.3308 c=7.680 [40]
Sc3B0.75C3 P4/mmm a=3.33150 c=7.6737 [40][43]
ScB15C0.80 [40]
ScB15C1.60 orthorhombic a=10.027 b=8.0138 c=5.6668 [40]
Sc12B185C9 P6/mmm a = 14.550 c = 8.954 V = 1641.7 Å3 [44]
Sc20⁢BC27 P4/ncc a = 7.5042 c =10.0386 superconductor Tc=7.8K; also ranging to Sc20B5C23 [45][46][47]
ScB15.5CN P3m1 a=5.568 c=10.756 Z=2 [48]
ScB12.7C0.62Si0.08 F43m a=20.3085 [49]
ScB12.9C0.72Si0.004 Pbam a=17.3040 b=16.0738 c=14.4829 [50]
ScB11.5C0.61Si0.04 P62m a = 14.3055 c = 23.7477 [51]
ScNi2B2C I4/mmm a=3.34 c=10.2 V=114 [52]
Fe23B3C3 cubic a=10.62 [53]
Sr3Cl2[CBN] Pnma yellow; carbidonitridoborate [54]
YBC a = 3.38 b = 13.69 c = 3.62 [55]
YB2C P42/mbc a = 6.769 c = 7.430 [36][55]
YB22C3 R3m a=5.623 c=44.765 V=1226.9 [56]
YB28.5C R3m a=5.649 c=56.899 V=1572.7 [56]
YB2C2 P4/mbm a = 5.351 c = 3.561 melt > 2500 °C; Young's modulus = 207 GPa, shear modulus = 87 GPa, bulk modulus = 116 GPa; degrades in water or moist air; Superconductor Tc=1.0 K [57][7][37][58]
YB22C2N R3m a=5.623 c=44.785 [59]
Y2B3C2 Cmmm a=0.3405 b=1.3765, c=0.3631 Z=2 V=170.2 Chain of B, with C branches [60]
Y5B2C5 P4/ncc a=8.1069 c=10.824 V=711.4 0D BC2 C [61]
Y5B2C6 P4 a=8.068 c=11.668 v=7.595 [62]
Y10.1B7C9.9 C2/c a=11.27 b = 11.16 c = 23.57 β = 98.15° Z=8 density 9.546; C-B-C and C-B-B-C [63][64]
Y15B4C14 (C4−)6(CBC5−)4•e− [65]
YB15.5CN P3m1 a=5.5919 c=10.873 Z=2 [48]
Y2B36Si9C R3m a=10.0344Å c=16.348 Z=6 [66]
YNi2B2C I4/mmm a=3.525 c=10.536 superconductor Tc 15.6K [52]
Y2NiBC2 [4]
Y5Ni6B6C5 [4]
Y5Ni8B8C5 [4]
Y16I19(C2B2C2)2 P1 a=12.311 b=13.996 c=19.695 α=74.96° β=89.51° γ=67.03° [67]
Y21I18(CBC)7 P1 a=10.660 b=15.546 c=18.41.6 α=82.49° β=85.01° γ=82.92° [67]
Nb3B3C Cmcm a = 3.2647 b=28.710 c=3.1285 Z=4 melt 2970 °C [68]
Nb4B3C2 Cmcm a =3.2287 b= 37.544 c = 3.1331 ? [68]
Nb7B4C4 Immm a =3.15441 b=3.2166 c=32.260 Z=2 ? [68]
Nb7B6C3 Cmmm a = 3.1341 b = 33.161 c = 3.2428 Z=2 ? [68]
Mo2BC Cmcm a=3.086 b=17.35 c=3.047 Z=4 superconductor Tc = 7.0 K; hard yet ductile [69][70][71]
YPd2B2C superconductor Tc = 23 K [72]
YPd5B3C0.3 superconductor Tc=23K [73]
YRh2B2C [72]
Ba21[BN2]11[C2] I4 a = 15.3879 c = 10.0736 Z=2 nitridoborate acetylide [74]
LaBC P212121 a = 8.646 b = 8.691 c = 12.479 [75]
LaB2C2 P4/mbm a=3.816 c=3.975 [36][76][77]
LaB2C4 2D [78][79]
LaB3C3 Pm3n a =4.6712 C6B6 forms truncated octahedron around La; semiconductor [80]
La4B3C12 [81]
La4B5C18 [81]
La5B2C6 P4 a=8.5933 c=12.7098 V=938.56 [52][62]
La5B4C4.85 Pna21 a=24.657 b=8.605 c=8.6540 Z=4 V=1836.2 shiny black [82]
La10B9C6 [78]
La10B9C12 P41212 a=8.6678 c=25.689 Z=4 V=1927.1 shiny black plates; CCCBBCBCBBCCC CBCBBCBC 0D chains [83][84]
La15B14C19 P21/c a=8.640 b=8.636 c=19.823 β=94.28 [83]
La3BC2H1.69 Cmcm a=3.804 b=12.744 c=11.240 [85]
La3BC2F~0.71 Cmcm a =3.8189 b=12.982 c=11.3585 [85]
La3BC2Cl~0.71 Cmcm a =3.8409 b =13.7068 c=11.2820 [85]
La3Cl2(CBC) Pnma a=14.871 b=3.898 c=11.363 [67]
La3Cl3BC P21/m a = 8.204 b = 3.8824 c = 11.328 β = 100.82◦ V=354.4 Z=2 metallic; chain of B with C branches [86]
LaNi2B2C I4/mmm a=3.793 c=9.824 [4]
La3Br2(CBC) Pnma a=15.323 b=3.974 c=11.580 [67]
La3Br3(BC) P21/m a=8.551 b=3.949 c=11.707 β=100.08 [67]
La9Br5(CBC)3 Pmmn a=33.27 b=3.859 c=7.907 superconductor Tc=6K [87]
La4I5B2C C2/m a=23.303 b=4.299 c=18.991 β=126.22° [67]
La9I5(CBC)3 Pmmn a=33.852 b=3.954 c=8.212 [67]
CeBC P212121 [88]
CeB2C R3m a=6.6138 c=11.2594 2D 6 and 9 membered rings fused [89]
CeB2C2 P4/mbm a=3.817 c=3.852 [90][77]
Ce5B2C5 P4/ncc a=8.5708 c=11.004 v=808.3 [62]
Ce5B2C6 P4 a=8.3654 c=12.5217 v=875.9 [62]
Ce5B4C5 Pna21 a=24.426 b=8.463 c=8.5007 Z=8 V=1757 black [91]
Ce10B8C10 0D B4C4 B3C3 BC2 C [78]
Ce10B9C12 P41212 a = 8.4785 c = 18.223 V = 1822.3 Å3 Z = 4 CCBCBCBCBCBCC9− CBCBBCBC8− [92][93]
Ce4B2C2H2.42 C2/m a=12.895 b=3.7661 c=9.530 β=130.69° [94]
Ce4B2C2F0.14H2.26 C2/m a=12.792 b=3.7475 c=9.478 β=130.65° [95]
Ce3BC2F~0.71 Cmcm a=3.7267 b=12.4893 c=11.1777 [85]
Ce3Cl2(CBC) Pnma a=14.690 3.836 c=11.260 [67]
Ce3Cl3(BC) P21/m a=8.138 b=3.773 c=11.199 [67]
Ce33Fe13B18C34 Im-3m a = 14.246 [96]
Ce10Co2.64B11.70C10 P1 a = 8.5131 b = 8.5144 c = 13.5709 α = 100.870° β = 93.677° γ = 90.041° Z = 2 [97]
CeNi2B2C I4/mmm a=3.6378 c=10.227 [4]
Ce3Br2(CBC) Pnma a=15.13.5 b=3.915 c=11.444 [67]
Ce3Br3(BC) P21/m a=8.471 b=3.867 c=11.623 β=99.70° [67]
Ce9Br5(CBC)3 Pmmn a=32.935 b=3.804 c=7.816 [67]
Ce6Br3(CB2C)C P2/m a=8.601 b=3.829 c=10.224 β=112.51° [67]
Ce4I5B2C C2/m a=23.194 b=4.290 c=18.822 β=126.50° [67]
CeRh2B2C I4/mmm a=3.843 c=10.176 [98]
CePd2B2C I4/mmm [98]
PrBC P212121 a = 8.4478 b = 8.4719 c = 12.325 [88][99]
PrB2C2 [100]
Pr2BC C2/m a = 13.088 b = 3.6748 c = 9.488 β = 131.03° [100]
Pr5B2C5 P4/ncc a=8.522 c=10.995 v=798.5

a=8.448 c=10.970 Z=4 V=782.9

black [62][101]
Pr5B2C6 P4 a=8.3954 c=12.248 v=863.3 [62]
Pr5B4C5 Pna21 a=24.592, b=8.4563 c=8.4918 Z=8 ferromagnetic < 12K; B4C4, B3C3, BC2 C [102]
Pr15B6C20 P1 a=8.3431 b=9.2492 c=8.3581 α=84.72° β=89.68° γ =84.23 Z=1° B2C4 C3 C [103]
Pr10B9C12 P41212 a = 8.4365 c = 25.468 Z = 4 [104]
Pr15B6C20 [100]
Pr25B14C26 P21/c a=4.243 b=8.4095 c=30.828 β=105.879° V=2100.6 Å3 [105]
Pr3BC2F0.71 Cmcm a=3.6928 b=12.287 c=11.1767 [85]
PrCo2B2C I4/mmm a=3.6156 c=10.3507 V=135.31 superconductor Tc=6K [106]
PrNi2B2C I4/mmm a=3.7066 c=9.9993 [4]
NdBC P212121 a = 8.370 b = 8.392 c = 12.253 [88][99]
NdB2C2 P4/mbm a=5.3823 c=3.7761 V=109.39 [107]
Nd2BC C2/m a = 12.732 b = 3.6848 c = 9.398 β = 130.43 [C=B-B=C]8– · 4 e– [108]
Nd5B2C5 P4/ncc a=8.4872 c=10.9591 V=789,4 0D BC2 C [61]
Nd5B2C6 P4 a=8.3500 c=12.146 v=846.8 [62]
Nd5B4C5 Pna21 a=24.301 b=8.3126 c=8.3545 Z=8 ferromagnetic < 15K; B4C4, B3C3, BC2 C [102]
Nd10B9C12 P41212 a = 8.3834 c = 25.352 Z=4 [104]
Nd15B6C20 P1 a=8.284 b=9.228 c=8.309 α=84.74° β=89.68° γ=84.17° Z=1 B2C4 C3 C [103]
Nd25B12C28 P1 a=8.3209 b=8.3231 c=29.888 α=83.730° β=83.294° γ=89.764° B2C4 B3C3 BC2 C [105]
Nd25B14C26 P21/c a=8.3404 b=8.3096 c=30.599 β=106.065° Z=2 [105]
NdNi2B2C I4/mmm a=3.6780 c=10.0814 [4]
SmBC P212121 [88]
SmB2C2 P4/mbm a=5.366 c=3.690 Z= V=106.26 density=6.126; 2D net of octahedrons and squares [109]
Sm5B2C5 P4/ncc a=8.331 c=10.926 V=758.3 0D BC2 C [61]
Sm5B2C6 P4 a=8.2409 c=11.971 v=813.0 [62]
SmNi2B2C I4/mmm a=3.6232 c=10.2437 [4]
GdB2C2 P4/mbm a = 5.3746 c = 3.6498 BC 2D-net of octagons and squares [110]
GdB2C4 [111]
Gd2B3C2 Cmmm a=3.445 b=13.773 c=3.7107 Z=2 1D chain of B with side -C; water sensitive [112][36]
Gd4B3C3 [111]
Gd4B3C4 P1 a = 3.637 b = 3.674 c = 11.859 α=93.34° β= 96.77 γ = 90.24 Z=1 black; (BC)∞ 1D C-B< chain and CBC 0D units [113][114]
Gd5B2C5 P4/ncc a=8.2455 c=10.8550 V=738.01 0D BC2 C [61]
Gd5B2C6 P4 a=8.1493 c=11.799 v=7.836 [62]
Gd9B10C6 [111]
Gd10B7C10 C2/c black; (BC)∞ 1D C-B< chain and CBC 0D units [113]
Gd15B4C14 (C4−)6(CBC5−)4•e− [65]
Gd2B36Si9C R3m a=10.0955 c=16.454 Z=6 [66]
GdCo2B2C I4/mmm [115]
GdNiBC P4/nmm a=3.631 c=7.546 [116]
GdNi2B2C I4/mmm a=3.588 c=10.392 [4]
Gd4Br3(BC)C P21/m a=9.577 b=3.705 c=12.493 β=106.69° [67]
TbB2C2 [117]
Tb2B2C3 Cmmm a = 3.412 b = 13.699 c = 3.669 V = 171.5Å3 , Z = 2 [118]
Tb2B4C Immm [119]
Tb4B3C4 P1 black; [113]
Tb5B2C5 P4/ncc a=8.1382 c=10.861 V=719.4 0D BC2 C [61]
Tb5B2C6 P4/ncc a = 8.1114 c = 11.43 [120]
Tb10B7C10 C2/c a=11.31 b=11.276 c=23.583 β=98.28° black; [113]
Tb15B4C14 P4/mnc a=8.1251 c=15.861 Z=2 (C4−)6(CBC5−)4•e−; ferromagnet <145K [65]
Tb1.8C2Si8(B12)3 R3m a=10.1171 c=16.397, V=1453.4 Z=3 band gap 0.9 eV [121]
TbCo2B2C I4/mmm [115]
TbNiBC P4/nmm [122]
Tb4Br3(BC)C P21/m [67]
DyB2C Pbam a = 6.7893 b = 6.7776 c = 3.7254 [120]
DyB2C2 P4/mbm a=5.345 c=3.5600 Z=2 [123]
Dy2B2C3 Cmmm a=3.396 b=13.694 c=3.627 [124]
Dy2B4C Immm a=3.2772 b=6.567 c=7.542 Z=2 [119]
Dy4B3C4 P1 a=11.387 b=3.5999 c=11.739 α=93.23° β=96.74° c=90.16° black; [113][124]
Dy5B2C5 P4/ncc a=8.0869 c=10.838 V=708.8 0D BC2 C [61]
Dy5B2C6 P4 a=8.0512 c=11.499 v=745.4 [62]
Dy10B7C10 C2/c a=11.387 b=11.147 c=23.715 β=98.06° black; [113][124]
Dy15B4C14 P4/mnc a=8.0882 c=15.884 (C4−)6(CBC5−)4•e−; ferromagnet <120K [65]
Dy2B36Si9C R3m a=10.0735 c=16.323 Z=6 [66]
DyCo2B2C I4/mmm [115]
DyNiBC P4/nmm [122]
DyNi2B2C I4/mmm a=3.542 c=10.501 Tc=3.8 K [125]
HoBC Cmmm a = 3.384 b = 13.697 c = 3.594 [126]
HoBC tetragonal a = 3.546 c = 46.40 [126]
HoB2C P42/mbc a = 6.773 c =7.399 [127][128][126]
HoB2C2 P42c a = 3.780 c = 7.074 [123][126]
HoB22C3 R3m a=5.614 c=44.625 V=1248.4 [56]
HoB28.5C R3m a=5.638 c=56.881 V=1566.0 [56]
Ho2BC3 tetragonal a = 3.561 c = 12.455 high temperature [126]
Ho2BC3 tetragonal a =3.567 c = 24.514(8 1500° [126]
Ho2B4C Immm [119]
Ho4B3C4 P1 black; [113]
Ho5B2C5 P4/ncc a=8.0355 c=10.827 V=699.1 magnetocaloric [129]
Ho5B2C6 P4 a=7.986 c=11.556 v=7.369 [62]
Ho10B7C10 C2/c black; [113]
Ho15B2C17 a = 8.004 c = 15.984(4 [126]
Ho15B4C14 (C4−)6(CBC5−)4•e− [126]
HoB15.5CN P3m1 a=5.5883 c=10.878 Z=2 [48]
HoB22C2N R3m a=5.614 c=44.625 V=1248.4 spin glass <22.5K [59][130]
Ho2B36Si9C R3m a=10.0643 c=16.2699 Z=6 [66]
HoCo2⁢B2⁢C I4/mmm 𝑎 =3.500 𝑐 =10.590 non-superconductor [131]
HoNiBC P4/nmm a=3.3.5261 c=7.556 V=95.9 Z=2 [122][132]
HoNi2B2C I4/mmm a=3.515 c=10.518 Tc=7.8 K [125]
HoNiBC P4/nmm a=3.563 c=7.546 [133]
ErB2C P42/mbc a=6.77 c=7.33 V=335.71 [134]
ErB2C2 P4/mbm [123]
ErB22C3 R3m a=5.624 c=44.681 V=1224.9 [56]
ErB28.5C R3m a=5.640 c=56.868 V=1566.5 [56]
Er2B4C Immm [119]
Er4B3C4 P1 black; [113]
Er5B2C5 P4/ncc a=7.9892 c=10.740 V=685.5 0D BC2 C [61]
Er5B2C6 P4 a=7.948 c=11.300 v=714 [62]
Er10B7C10 C2/c black; [113]
Er15B4C14 P4/mnc a=7.932 c=15.685 Z=2 (C4−)6(CBC5−)4•e−; ferromagnet <50K [65]
ErB22C2N R3m spin glass <5K [59][130]
ErB15.5CN P3m1 a=5.5889 c=10.880 Z=2 [48]
Er2B36Si9C R3m a=10.016 c=16.309 Z=6 [66]
ErNiBC P4/nmm ferromagnetic [122]
ErNi2B2C I4/mmm a=3.500 c=10.533 [4]
TmB2C P42/mbc antiferromagnetic < 12K [135]
TmB2C2 P4/mbm a=3.776 c=3.477 [136][77]
TmB22C3 R3m a=5.631 c=44.737 V=1228.7 [56]
TmB28.5C R3m a=4 5.622 c=56.649 V=1550.9 [56]
Tm4B3C4 P1 black; [113]
Tm5B2C5 P4/ncc a=7.9299 c=10.810 V=679.8 0D BC2 C [61]
Tm5B2C6 P4 a=7.888 c=11.337 v=705.4 [62]
Tm15B4C14 (C4−)6(CBC5−)4•e− [65]
TmB15.5CN P3m1 a=5.580 c=10.850 Z=2 [48]
TmB22C2N R3m [59]
Tm2B36Si9C R3m a=10.0156Å c=16.296 Z=6 [66]
TmNi2B2C I4/mmm a=3.494 c=10.613( [4]
YbB2C2 a=3.775 c=3.552 hydrolised to C, YbB6, Yb3(OH)3n(BO3)(3-n) CO2 CO hydrocarbons H2 [137][77]
Yb4B3C4 P1 black; [113]
Yb5B2C5 P4/ncc a = 7.872 c = 10.774 [120]
Yb15B4C14 P4/mnc a = 7.8601, c = 15.504 (C4−)6(CBC5−)4•e− [65]
Yb2B36Si9C R3m a=10.1103Å b=16.314 Z=6 [66]
YbNiBC P4/nmm a=3.503 c=7.556 [138]
YbNi2B2C I4/mmm a=3.4782 10.607 [52]
LuB2C P42/mbc a=6.7546 c=7.1781 [35]
LuB2C Pbam a=6.7429 b=6.7341 c=3.5890 Z=4 [127]
LuB2C2 P4/mbm a=3.762 c=3.453 [136][77]
LuB22C3 R3m a=5.595 c=44.464 V=1205.7 [56]
Lu3BC3 Cmcm a = 4.9788 b = 5.0109 c = 15.669 Z = 4 CBC and C [139]
Lu4B3C4 P1 a=3.4198 b=3.474 c=11.73 α=92.63° β=96.22° γ=89.99° black; [113]
Lu15B4C14 (C4−)6(CBC5−)4•e− [65]
LuB15.5CN P3m1 a=5.5771 c=10.839 Z=2 [140]
LuB22C2N R3m [59]
LuNiBC P4/nmm a=3.4985 c=7.7556 Z=2 [141]
LuNi2B2C I4/mmm a=3.462 c=10.629 suerconductor Tc 16.6K [52]
Lu2NiBC2 [4]
Mo0.9W1.1BC a=3.07472 b=17.2955 c=3.04001 @330Mpa Vickers Hardness = 42 Gpa (superhard) [142]
CeIr2B2C I4/mmm a=3.849 c=10.357 [98]
YPt2B2C I4/mmm superconductor Tc=10 K [143]
LaPt2B2C I4/mmm a = 3.8681 c = 10.705 Z=2 superconductor Tc=10K [106]
CePt2B2C I4/mmm [98]
PrPt2B2C I4/mmm a=3.8373 c=10.7610 V=158.45 superconductor Tc=6K [106]
NdPt2B2C I4/mmm a=3.826 c= 10.732 superconductor Tc=1.6K [144]
ThBC P4122 a = 3.762 c = 25.246 Z = 8. melt 2101° [145]
ThB2C R3m a=6.676 c=11.376 Z=9 V=439.1 2D; melt 2040° [36][146]
Th2B2C3 Pnnm a = 13.0655 b = 3.9757 c = 3.6507 [147]
Th3B2C3 P2/m a=3.703 b=9.146 c=3.773 γ=100.06° [148]
Th2ScB6C3 P6/mmm a = 0.660296 c = 0.35842 [149]
ThNiBC tetragonal c/a=1.98 superconductor Tc = 0.7 K [150]
ThNi2B2C [52]
UBC Cmcm a=3.591 b=11.95 c=3.372 melt 2144° [151]
α-UB2C Pmma a = 6.0338 b = 3.5177 c = 4.1067 V = 87.2 Z = 2. 2D; formed below 1675 °C [36][152][153]
β-UB2C R3m melt 2280° [152]
UB0.78C1.22 Cmcm a = 3.5752 b = 11.8584 c = 3.3881 1D 1/∞-[B2C2] [154]
U5B2C7 tetragonal a = 7.84 c = 23.58 [78][155]
U2ScB6C3 P6/mmm a = 6.5096 c = 3.4265 ferromagnet TC = 61 K [156][157]
NpBC Cmcm a=3.5913 b=12.0566 c=3.3803 [158]
NpB2C R3m a=6.536 c=10.752 Z=9 [159][160]
PuBC Cmcm a=3.5890 b=12.0210 c=3.3910 [158]
PuB2C R3m a=6.5104 c=10.7966 Z=9 [159][160]

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