Abstract
Annealed (H1) and cold-rolled (H2) HAVAR has been studied using high-pressure synchrotron X-ray diffraction. A structural phase transformation was discovered at ~13 GPa at ambient temperature, transforming from m -3 m (S.G.225) to P 63/m m c (S.G.194) symmetry. The transition was not reversible on pressure release. The low-pressure cubic phase was found to be more compressible than the high-pressure hexagonal phase. Conventional Mössbauer and NFS shows that the HAVAR is not magnetic at room temperature and no splitting is observed. The SQUID indicates a huge difference in the temperature dependence of the magnetic susceptibility between the cold Rolled HAVAR compared to the annealed HAVAR.
Original language | English |
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Pages (from-to) | 135-141 |
Number of pages | 7 |
Journal | Hyperfine Interactions |
Volume | 197 |
Issue number | 1 |
DOIs | |
State | Published - 2010 |
Externally published | Yes |
Keywords
- Crystallographic structure
- Diamond anvil cell (DAC)
- HAVAR
- High-pressure
- Magnetic properties