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Alternatively, FeOCl may be prepared by the thermal decomposition of FeCl3⋅6H2O at 220 °C (428 °F) over the course of one hour:
FeCl3 ⋅ 6H2O → FeOCl + 5 H2O + 2 HCl
References
Lind, M. D. (1970-08-15). "Refinement of the crystal structure of iron oxychloride". Acta Crystallographica Section B. 26 (8): 1058–1062. doi:10.1107/s0567740870003618.
^ Kikkawa, S.; Kanamaru, F.; Koizumi, M.; Rich, Suzanne M.; Jacobson, Allan (1984-01-01). Holt, Smith L. Jr. (ed.). Layered Intercalation Compounds. John Wiley & Sons. pp. 86–89. doi:10.1002/9780470132531.ch17. ISBN9780470132531.