Boride

Aluminium magnesium boride (AlMgB14), also known as BAM, is a chemical compound of aluminium, magnesium and boron, and is a ceramic alloy that is highly resistive to wear with a low coefficient of sliding friction.

Boron compounds are very toxic and therefore considered and industrial poison

Lanthanum hexaboride (LaB6, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210 °C, and is insoluble in water and hydrochloric acid

Several borides can be formed by direct combination of plutonium and boron powders in an inert atmosphere at reduced pressure.

Samarium is considered a rare earth metal. These metals are moderately to highly toxic.

Titanium diboride (chemical formula tib2) is an extremely hard ceramic compound composed of titanium and boron which has excellent resistance to mechanical erosion.

ZrB2A hard, toxic, gray powder that melts at 3000°C; used as an aerospace refractory, in cutting tools, and to protect thermocouple tubes. Also known as zirconium diboride.