Abstract
The crystal field disorder in some tetragonal and trigonal Ca-gallo-germanates, i.e., A2Fe2Z07 and A2LnFe3Ge3014 with A=Ba or Sr, Ln=La or Nd and Z=Ge or Si, has been studied by 57Fe Mossbauer spectroscopy. The observed distribution of the hyperfine fields is analysed from a theoretical model based on the additive perturbation approximation of crystal fields, a rigid lattice of ionic point charges and the random substitution of Fe3+/Z4+ and A2+/Ln3+.
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