Abstract
Cathodes removed from fully discharged Li{vert bar}LiClO{sub 4}-propylene carbonate{vert bar}FeS{sub 2} cells have been studied by {sup 57}Fe Moessbauer spectroscopy. Experiments carried out at 295, 77, and 4.2 K indicated that the major phase present was a mixture of superparamagnetic iron particles and bulklike {alpha}-iron. Chemical reduction of FeS{sub 2} with n-BuLi in hexane also yielded a similar mixture. Measurements in external magnetic fields of up to 1.5 T confirmed the presence of superparamagnetic iron, and these data led to an estimate of the average particle diameter of 3.6 {plus minus} 0.1 nm. An analysis of the data in terms of superferromagnetism was inconsistent with the variable-temperature measurements.
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