TlC2N

TlC₂N is an advanced ceramic compound combining thallium, carbon, and nitrogen—a ternary ceramic material belonging to the family of transition metal carbonitrides. This is a research-phase material with limited commercial deployment; it represents exploration into ultra-high-hardness ceramic systems potentially useful for extreme wear and thermal environments where conventional carbides or nitrides reach their performance limits. The material's primary appeal lies in potential applications requiring exceptional hardness combined with chemical inertness, though its thallium content raises significant toxicity concerns that currently limit widespread industrial adoption.