Simple metal containing carbides and nitrides
From apm
There are few/no natural mineral examples for these compounds.
This is likely because all these compounds are in a highly reduced stated and some of them are
not even capable of forming a protective macroscale passivation layer.
Contents
Awesome compounds
Titanium:
- TiC Titanium carbide – and ZrC Zirconum carbide
- TiN Titanium nitride – and ZrN Zirconium nitride
Silicon (counting silicon as metal here):
- SiC Silicon carbide
- Si3N4 Silicon nitride
For more awesome compounds see: Base materials with high potential
Related: Metallocarbohedryne (titanium carbides)
Compounds that need to be sealed in PPV to be usable
Iron:
- Fe3C Iron carbide aka cementite aka iron cohenite – ortorhombic – Mohs 5.5 to 6.0 – 7.20 to 7.65g/ccm – metallic luster
- Iron nitrides – Wikipedia: "Group 7 and group 8 transition metals form nitrides that decompose at relatively low temperatures" Fe2N 400°C
Aluminum:
- Al4C3 Aluminum carbide [1] – hydrolyses in contact with water
- AlN [2] – hydrolyses in contact with water – it's a diamond like compound (a III-VI semiconductor) – highly covalent character
Calcium:
- CaC2 Calcium carbide [3] – must be kept dry – releases ethyne on contact with water
- Ca3N2 calcium nitride [4] – highly reactive with water
Magnesium:
- Mg3N2(s) Magnesium nitide [5] – reacts with water
- Magnesium carbide ??
Compounds with more rare elements
Nitrides:
- CrN – Carlsbergite (mineralienatlas) wikipedia: chromium nitride – carlsbergite – Mohs 7 – 1770°C
- VN – Uakitite (wikipedia) – Mohs ??
- Semimetal: Ge3N4 – Germanium nitride
- ZrN – Zirconium nitride
- NbN – Niobium nitride – 2573°C – 8.47g/ccm
- MoN (and Mo2N) – Molybdenium nitride (?)
- (W2N, WN, WN2) Tungsten nitride – unstable against water
- HfC – Hafnium carbide – refractory compound
- TaN (anf other stoichometries) – Tantalum nitride
Carbides:
4th period:
- Cr3C2 – Tongbaite (wikipedia) (mineralienatlas) – Mohs 8.5 – ortorhombic – 1,895 °C
- Various chromium carbides: Chromium(II) carbide
- Cr3C2; Cr7C3; Cr23C6 (1,895 °C; 3,443 °F; 2,168 K; extremely hard; very corrosion resistant)
- VC (2810 °C; 9-9.5 Mohs, cubic)
- Semimental: Germanium carbide??
5th period:
- ZrC (3532 °C; extremely hard; highly corrosion resistant; very metallic, cubic)
- Nb2C (3490 °C; extremely hard; highly corrosion resistant)
- Mo2C (2692 °C) [6]; MoC; Mo3C2 [7]
6th period:
- HfC (3900 °C; very refractory; low oxidation resistance, cubic)
- TaC – Tantalum carbide (mineralienatlas) – Mohs 6-7 – tantal is very rare
- WC – Qusongit (mineralienatlas) – Mohs 7.25
Borides:
4th period:
- CrB (and other stoichometries Cr2B, Cr5B3, Cr3B4, CrB2, and CrB4) – Chromium(III) boride – refractory 2100°C – very hard
- VB, VB2 – Vanadium boride (?)
5th period:
- Zr2 – Zirconium diboride
- Nb2 – Niobium diboride
- Molybdenium boride ??
6th period:
- Hf2 – Hafnium diboride
- Ta2 – Tantalum boride
- WB2 (WB, WB4) – Tungsten borides
- ReB2 Rhenium_diboride
- OsB, Os2B3 and OsB2 – Osmium borides
