| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1614812 | Journal of Alloys and Compounds | 2013 | 5 Pages |
New cubic phases of YbGe2.85, TbGe2.85 and DyGe2.85 crystallized in the AuCu3 structure are synthesized at a pressure of 8 GPa. Using the differential perturbed angular γγ-correlation method (TDPAC) we measure the electric field gradient Vzz (the quadrupole frequency νQ=eQVZZ/hνQ=eQVZZ/h) at 111Cd nuclei probes inserted in Ge vacancy lattice sites for all these compounds. In YbGe2.85 the electric field gradient (EFG) is obtained as a function of pressure (up to 8 GPa) at room temperature and as a function of temperature (down to 4 K) at normal pressure. In TbGe2.85 and DyGe2.85 EFG is measured only as a function of temperature (down to 77 K) at normal pressure. In YbGe2.85 the change of EFG and νQ with pressure indicate a change of Yb valance from 2.46 at normal pressure to 2.89 at 8 GPa. In all compounds EFG and νQ are found to be practically independent of temperature.
► Cubic phases of YbGe2.85, TbGe2.85 and DyGe2.85 have been synthesized at 8 GPa. ► TDPAC spectra of 111Cd probe nuclei in YbGe2.85, TbGe2.85 and DyGe2.85 were obtained. ► Close similarity between RGe2.85 and RSn3 (R = Yb, Tb, Dy) has been found. ► The dependence of Yb valence in YbGe2.85 on pressure up to 8 GPa has been found.
