Abstract
Structural, magnetization and Mössbauer measurements are reported on REF 2Si 2 ( RE = La, Ce, Nd, Gd, Er). In contradiction with earlier reports, all these compounds contain only one type of Fe atom with no magnetic moment on it. The antiferromagnetic phase of Nd, Gd and Er compounds produces hyperfine magnetic fields at half of the Fe sites and no field at the other half. This permits us to predict the antiferromagnetic structure. La and Ce compounds show weak paramagnetic behavior indicating tetravalent Ce and trivalent La atoms in these structures.
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