Department of Physical Chemistry, University of Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands
Abstract:
The cation distribution has been studied with 57Fe Mössbauer spectroscopy in the garnet system Eu3?ySc2+yFe3O12 with y = 0.0, 0.2 and 0.5. It is shown that the previously proposed cation distribution is not correct. The problem of possible impurities in the investigated system is discussed in detail. Several possible cation distributions are considered compatible with Mössbauer data. Mössbauer results combined with the composition dependence of lattice constants show that the tetrahedral sites are accessible to Sc3+ ions. The system studied is a second example of a garnet structure in which Sc3+ ions are found at the tetrahedral sites. A small fraction of Sc3+ ions for the samples y = 0.2 and 0.5 is also found at the dodecahedral sites.