The magnetic order of TbNi 2 B 2 C below T N ϭ15 K has been studied via 57 Fe Mössbauer spectroscopy and muon spin relaxation ͑SR͒. It is shown that only below 8 K all components of the Tb moment are locked. This is traced from an unusual increase and a turning of the transferred magnetic hyperfine field at the 57 Fe dopants, and also from a decrease of the fluctuation rate of electronic moments detected from SR. We relate this locking of the moment to the ferromagnetically ordered component which was concluded from neutron diffraction experiments.
The complexation of iron(iii) chloride with 1,4,7-tris[3,4-bis(decyloxy)-benzyl]-1,4,7-triazacyclononane leads to a liquid crystalline product, which forms a second mesophase after thermal treatment at around 70 8C above the first clearing temperature. Polarizing microscopy, DSC, and UV observations reveal a transformation, which was further investigated by Mössbauer spectroscopy. In different temperature ranges, various octahedral, binuclear iron(iii) complexes are present along with a monomeric species. In the presence of water and oxygen, the iron(iii) center participates in a redox equilibrium.
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