@Article{JAMS-3-89,
author = {Shen , Xiao-Li},
title = {The Synthesis, Structural Characterization and Superconductivity of $FeSe_x$ with $0.80 \leq x \leq 1.20$},
journal = {Journal of Atomic and Molecular Sciences},
year = {2012},
volume = {3},
number = {1},
pages = {89--94},
abstract = {<p style="text-align: justify;">We have performed a detailed study on the synthesis, the characterization of structural phases and superconductivity of the binary $FeSe_x$ system from the $Fe$-rich phase into 
the $Se$-rich phase with $0.80 ≤ x&nbsp;≤1.20.$ The results indicate that by long-time low-temperature annealing, single phase sample could be obtained near the composition of $FeSe_{0.95}$&nbsp;with the tetragonal PbO-type structure, while impurities of $Fe$ or $Fe_7Se_8$ would appear if Fe enriched or $Se$ enriched in the starting composition respectively. 
Bulk superconductivity 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.</p>},
issn = {2079-7346},
doi = {https://doi.org/10.4208/jams.040311.051411a},
url = {http://global-sci.org/intro/article_detail/jams/8275.html}
}