Abstract
The compounds Yb(Cu,Ag,Au)Sb were synthesized via high frequency melting of the elements in a closed Ta-crucible. The crystal structure of the novel phases was determined from X-ray powder Rietveld refinements. Dependent on the ratio R Yb/ R (Cu,Ag,Au) different structure types were encountered: YbCuSb (ordered Ni 2In-type, R F=0.036), YbAgSb (TiNiSi-type, R F=0.054) and YbAuSb (LiGaGe-type, R F=0.038). The results of the magnetic measurements revealed that the compounds YbCuSb and YbAgSb are temperature independent Pauli-type paramagnets whilst a small magnetic moment (≈1β B) was observed for YbAuSb. In good agreement, X-ray absorption spectroscopy (at 10 and 300 K) confirmed for all three compounds dipositive Yb temperature independent valencies of 2.06 (M = Ag), 2.08 (Cu) and 2.14 (Au); possibly owing to small amounts (less than upo to ≈ 4%) of Yb 3+ grain boundary effects.
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