| Clue | Source | Date |
|---|---|---|
| Compound in low-carbon steel | Wall Street Journal | 26 Jul 2023 |
| Ceramic iron compound that's nonconductive | New York Times | 04 Nov 2022 |
| Ceramic iron compound that’s nonconductive | New York Times | 04 Nov 2022 |
| Iron compound found in steel | New York Times | 13 Dec 2017 |
| Iron compound found in steel | ||
| Magnet material | ||
| Compound of iron | ||
| Magnet material | ||
| Ceramiclike compound | ||
| Compound in computer memory cores | ||
| Pure iron | ||
| Iron compound |