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We have performed a detailed study on the synthesis, the characterization of structural phases and superconductivity of the binary FeSex system from the Fe-rich phase into the Se-rich phase with 0.80≤ x≤1.20. The results indicate that by long-time low- temperature annealing, single phase sample could be obtained near the composition of FeSe 0.95 with the tetragonal PbO-type structure, while impurities of Fe or Fe 7 Se 8 would appear if Fe enriched or Se enriched in the starting composition respectively. Bulk super- conductivity was found to exist in highly Se deficient phase, but not the single phase, and superconductivity is very sensitive to the Se vacancy content. The anomalous downturn of resistivity around 100 K was eliminated in Se-rich phase, along with the suppression of the main superconducting phase.

journal of atomic and molecular sciences

The synthesis, structural characterization and superconductivity of FeSe&lt;sub&gt;x&lt;/sub&gt; with &lt;em&gt;080 =&amp;lt; x =&amp;lt; 120&lt;/em&gt;