Valence and delocalization of yb in the Chevrel-phase YbMo 6 S 8

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Data
1983
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http://hdl.handle.net/10183/103996
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Abstract
Mãssbauer isomer-shift measurements show that Yb is divalent in YbMo6Sg. The asymmetry of the Yb thermal vibration at 4.2 K obtained from the Goldanskii-Karyagin effect is much smaller than that obtained from a Rietveld refinement of neutron powder diffraction data at 16 K. This suggests that the displacement of Yb off the origin includes a significant, ~0.1-Å, static component which persists at low temperature. Full structural refinements at 16, 77, and 295 K show several interesting structura  ... 
Mãssbauer isomer-shift measurements show that Yb is divalent in YbMo6Sg. The asymmetry of the Yb thermal vibration at 4.2 K obtained from the Goldanskii-Karyagin effect is much smaller than that obtained from a Rietveld refinement of neutron powder diffraction data at 16 K. This suggests that the displacement of Yb off the origin includes a significant, ~0.1-Å, static component which persists at low temperature. Full structural refinements at 16, 77, and 295 K show several interesting structural changes versus temperature.  ... 
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Physical review. B, Condensed matter. New York. Vol. 27, no. 3 (Feb. 1983), p. 1465-1473
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