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The discharged state of the iron (Edison) electrode in alkaline solution has been reported historically as a number of materials, usually as either FeO or Fe(OH)2. Recent x-ray crystallography data, obtained independently in the two laboratories represented by the authors, indicates the material to be Fe(OH) 2 or FeaO4, depending on the conditions of discharge. X-ray patterns were obtained by in situ techniques with electrodes cycled in sealed polyethylene bags, as well as with washed and dried active materials.

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