ferrite

The interstitial solid solution of carbon in body-centered cubic iron.

ferrite transition zone

Technical terms like ferrite, perlite, graphite, and hardenite were bandied to and fro, and when Paget glibly brought out such a rare exotic as ferro-molybdenum, Benson forgot that he was a master ship-builder, […]

Any of a class of metal oxides which show ferrimagnetism; used in transformers, inductors, antennas, recording heads, microwave devices, motors and loudspeakers.

ferrite magnets

The actual hardware is obsolete; for example, the memories are of the old ferrite core type.

The anion FeO₂²⁻, and any of the salts (formally derived from the unknown ferrous acid) derived from it.

sodium ferrite

calcium ferrite