keraamika metallide (nt Al, Ti, Zr) ja metalloidide (Si) nitriidide baasil; tuntuim on räninitriidi (Si3N4) baasil tehnokeraamika (vt nitriid), inorganic componds of metallic (e.g. Al, Ti, Zr) or metalloid (Si) elements with nitrogen; silicon nitride (Si3N4) is the most important nitrogen ceramic (see: nitride)