A Moessbauer study of intercalated layered compound 2H-Fe0.5TaSe2

The 57Fe Moessbauer study has been performed for the intercalated compound 2H-Fe0.5TaSe2 over a temperature range between 14 and 500 K. The intercalation samples 2H-FexTaSe2 with high content of Fe(x up to 2) are prepared by electrochemical method for the first time. The Moessbauer measurement shows that iron is in high spin state of Fe3+ and occupies both octahedral and tetrahedral interstices of the Van der Waals gap with same probability. The fact that effect masses Meff of iron ions in both sites are close to 57 μ and the characteristic temperatures are found to be relatively small (Θm = 130 K, 109 K respectively) is attributed to the weak forces on Fe3+