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Abstract
Compounds of the system FeAs 2− x Se x were ynthesized both as polycrystalline powders by direct combination of the elements and as single crystals by chemical vapor transport. Electrical and magnetic measurements were made on well-characterized samples. These measurements showed that the substitution of selenium for arsenic in the diamagnetic semiconductor FeAs 2 results in metallic, paramagnetic behavior. These results are consistent with a band model proposed by Goodenough for compounds crystallizing in the marcasite structure.
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