Abstract
The ternary silicides CeT 2Si 2 have been investigated with respect to crystal chemistry and magnetochemical behaviour. Ce{Ru, Rh, Pd, Os} 2Si 2 crystallize with the body-centred tetragonal ThCr 2Si 2-type structure, whereas CePt 2Si 2 and h-CeIr 2Si 2 adopt the primitive tetragonal CePt 2Si 2-type structure and CaBe 2Ge 2-type structure respectively. h-CeIr 2Si 2 exhibits a phase transition into a ThCr 2Si 2-type low temperature modification ( T u ≈ 920 ° C). The magnetic behaviour at low temperatures is characterized by the onset of antiferromagnetic ordering in the case of CeRh 2Si 2 whereas a non-magnetic cerium ground state is proposed for the remaining platinum metal members Ce{Ru, Pd, Os, Ir, Pt} 2Si 2, which was interpreted in terms of the interconfiguration fluctuations model. Boron solubility in Ce{Ru, Os} 2Si 2− x B x at 1000 °C was found to be limited at x ≈ 1 and resulted in a rather small change in the susceptibility values as compared with those of the ternary silicides CeRu 2Si 2 and CeOs 2Si 2.
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