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X-ray and time differential perturbed angular correlation measurements in ZrCr sub 2 and ZrCr sub 2 H sub 3 Laves phase compounds
The existence of stacking defects in ZrCr sub 2 has been detected by x-ray analysis and the time differential perturbed angular correlation (TDPAC) technique, using exp 181 Ta probes occupying Zr sites. It was found that two types of Zr site are responsible for the large observed width of the distri...
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Published in: | Journal of alloys and compounds 1995-06, Vol.224 (1), p.60-65 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | The existence of stacking defects in ZrCr sub 2 has been detected by x-ray analysis and the time differential perturbed angular correlation (TDPAC) technique, using exp 181 Ta 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 exp 181 Ta probes. One type of Zr site is the normal P6 sub 3 /mmc lattice position which possesses 3m point symmetry. The other zirconium site comes from stacking defect positions which relax to a local configuration with 43m point symmetry, thus generating strains around the defects. The mean EFG and its asymmetry parameter eta for ZrCr sub 2 are temperature independent in the range 77 < =T < =300K, while for ZrCr sub 2 H sub 3 a phase transition occurs at 230K. This phase transition is quite wide and ranges from 200 to 260K. |
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ISSN: | 0925-8388 |