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The crystal field disorder in some tetragonal and trigonal Ca-gallo-germanates, i.e., A2Fe2ZO7 and A2LnFe3Ge3O14, with A = Ba or Sr, Ln = La or Nd and Z = Ge or Si, has been studied by 57Fe Mössbauer 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...
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