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Crystallographic and magnetic structure of HAVAR under high-pressure using diamond anvil cell (DAC) |
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| Authors: | Itzhak Halevy Shlomo Haroush Yosef Eisen Ido Silberman Dany Moreno Amir Hen Mike L Winterrose Sanjit Ghose Zhiqiang Chen |
| Institution: | 1. Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva, Israel 2. Department of Materials Science California Institute of Technology, Pasadena, CA, 91125, USA 3. NRC Negev, Israel, Soreq NRC, Yavne, Israel 4. Soreq NRC, Yavne, Israel 5. Department of Nuclear Engineering, Ben Gurion Univ., Beer-Sheva, Israel 6. NSLS, Brookhaven National Laboratory, Upton, NY, 11973, USA |
| 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. |
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