Fe-K-Se, Intercalation, K0.88Fe1.63S2 tI50 87

• Fe-K-Se-Tl
• Fe-K-Se-Te
• magnetic properties
• superconductivity
• optical properties
• Moessbauer spectra
• structural properties
• diamagnetic
• intercalation
• alkali
• chalcogen
• transitional
• tetragonal