161Dy Time‐Domain Synchrotron Mössbauer Spectroscopy for Investigating Single‐Molecule Magnets Incorporating Dy Ions

Time‐domain synchrotron Mössbauer spectroscopy (SMS) based on the Mössbauer effect of ¹⁶¹Dy has been used to investigate the magnetic properties of a Dy^III‐based single‐molecule magnet (SMM). The magnetic hyperfine field of [Dy(Cy₃PO)₂(H₂O)₅]Br₃?2 (Cy₃PO)?2 H₂O?2 EtOH is with B₀=582.3(5) T significantly larger than that of the free‐ion Dy^III with a ⁶H_15/2 ground state. This difference is attributed to the influence of the coordinating ligands on the Fermi contact interaction between the s and 4f electrons of the Dy^III ion. This study demonstrates that ¹⁶¹Dy SMS is an effective local probe of the influence of the coordinating ligands on the magnetic structure of Dy‐containing compounds.     

Mößbauer- und Neutronenbeugungs-Messungen an Li6FeCl8

Mößbauer and Neutron Diffraction Studies on Li₆FeCl₈ On Suzuki-Type Li₆FeCl₈ Mößbauer spectra and neutron powder diffraction data are presented. The Suzuki-type structure (space group Fm3 m, Z = 4, 1 031.11(1) pm) was supported refining by the Rietveld method (program PROFIL) to a final R₁ = 6.8%. The Mößbauer spectra confirm the ideal octahedral coordination of the Fe²⁺ ions (no quadrupole splitting). The isomer shift of 1.097(1) mm s^?1 at 295 K resembles those of other ferrous chlorides. At temperatures above the phase transition to deficient NaCl-type solid solution the half-width of the Mößbauer signal strongly increases.