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. 2012 May 28;2:426. doi: 10.1038/srep00426

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(a) β-FeSe; (b) K_0.8Fe_1.7Se₂ (by high-temperature route); (c) Nominal LiFe₂Se₂; (d) Nominal NaFe₂Se₂; (e) Nominal KFe₂Se₂ (background corrected), peaks marked by ‘’ are due to unknown phase; (f) Nominal Ca_0.5Fe₂Se₂; (g) Nominal Sr_0.8Fe₂Se₂; (h) Nominal Ba_0.8Fe₂Se₂; (i) Nominal EuFe₂Se₂; (j) Nominal Yb_0.8Fe₂Se₂. Peaks marked by ‘*’ are due to residual β-FeSe.

Inline graphic — (a) β-FeSe; (b) K_0.8Fe_1.7Se₂ (by high-temperature route); (c) Nominal LiFe₂Se₂; (d) Nominal NaFe₂Se₂; (e) Nominal KFe₂Se₂ (background corrected), peaks marked by ‘’ are due to unknown phase; (f) Nominal Ca_0.5Fe₂Se₂; (g) Nominal Sr_0.8Fe₂Se₂; (h) Nominal Ba_0.8Fe₂Se₂; (i) Nominal EuFe₂Se₂; (j) Nominal Yb_0.8Fe₂Se₂. Peaks marked by ‘*’ are due to residual β-FeSe.