Growth Poisoning of Lithium Fluoride from Aqueous Solutions

The presence of a few ppm of step poisons strongly alters both crystal growth and dissolution rates. It was known that a few ppm ferric fluoride was a poison for the dissolution of lithium fluoride. In the present report it is shown that ferric fluoride is also a growth poison for lithium fluoride from aqueous solution. Ferric fluoride has the properties characterizing a step poison for the lithium fluoride-water system.