Question

Addition of various impurities to the environment is known as​

Answer 1

Impurities present in ceramic materials are often able to change the material properties substantially, even at low concentrations. In this respect, the thermal conductivity of beryllia or aluminum nitride is considerably diminished by cationic and anionic impurities. The neutron efficiency of a nuclear reactor core is affected by neutron adsorbers such as boron or europium in nuclear fuels