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Synthesis, crystal structure, and chemical stability of the superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>FeSe</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
We report on a comparative study of the crystal structure and the magnetic properties of ${\text{FeSe}}_{1\ensuremath{-}x}$ $(x=0.0--0.15)$ superconducting samples by neutron powder-diffraction and magnetization measurements. The samples were synthesized by two different methods: a ``low-temperature'' one using powders as a starting material at $T\ensuremath{\simeq}700\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$ and a ``high-temperature'' method using โฆ