Abstract
The existence of stacking defects in ZrCr 2 has been detected by X-ray analysis and the time differential perturbed angular correlation (TDPAC) technique, using 181Ta probes occupying Zr sites. It was found that two types of Zr site are responsible for the large observed width of the distribution of electric field gradient (EFG) at the 181Ta probes. One type of Zr site is the normal P6 3/ mmc lattice position which possesses 3 m point symmetry. The other zirconium site comes from stacking defect positions which relax to a local configuration with 4 3 m point symmetry, thus generating strains around the defects. The mean EFG and its asymmetry parameter ν for ZrCr 2 are temperature independent in the range 77⩽ T⩽300 K, while for ZrCr 2H 3 a phase transition occurs at 230 K. This phase transition is quite wide and ranges from 200 to 260 K.
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