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The 11-type Fe-chalcogenides belong to the family of Fe-basedsuperconductors. In these compounds, the interstitial Fe is known to stronglyinfluence the magnetic and superconducting properties. Here we present thechemical homogeneity range of ternary compounds Fe$_{1+y}$Te$_{1-x}$Se$_x$based on powder x-ray diffraction, energy dispersive x-ray analysis andmagnetization measurements. Our investigations show that the maximum amount ofexcess Fe in homogeneous Fe$_{1+y}$Te$_{1-x}$Se$_x$ decreases with increase inSe substitution for Te. Using our synthesis procedure, single-phaseFe$_{1+y}$Te$_{1-x}$Se$_x$, with $~0.5 \leq x <~1$ could not be formed for anyamount of excess Fe. Further, the superconducting volume fraction in thematerial is found to be strongly suppressed by excess Fe.

Homogeneity range of ternary 11-type chalcogenides Fe$_{1+y}$Te$_{1-x}$Se$_x$