Of cerium in its lower valency (3).
- The fluorescence of the cerous ion in aqueous solution has been the subject of a number of studies 1-3.
- The amount of cerous chloride is 5% or less, more preferably 2% or less on the basis of the weight of chromic oxide.
- Metallic cerium is prepared by metallothermic reduction techniques, such as by reducing cerous fluoride with calcium, or by electrolysis of molten cerous chloride or other cerous halides.
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