Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5457529 | Intermetallics | 2017 | 5 Pages |
Abstract
UIr2 was investigated using high pressure x-ray diffraction technique up to 55Â GPa. The compound remains stable in its cubic structure (Space Group: Fd-3m) up to 40Â GPa. Above 40Â GPa x-ray diffraction pattern indicates the emergence of a yet unidentified phase. The large structural stability of cubic MgCu2 type structure, predicted empirically, is not exhibited in this compound. Zero pressure bulk modulus and its pressure derivative are found to be 284Â GPa and 7.9 respectively. The high bulk modulus value obtained is indicative of itinerant nature of 5-f electrons which is also supported by Hill limit criteria. Electronic structure calculations indicate that uranium tetrahedral network is less rigid as compared to iridium tetrahedral network. Valley in density of states at Fermi level deepens with pressure vindicating observation of a more stable phase at high pressure.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Balmukund Shukla, N.R. Sanjay Kumar, Sharat Chandra, N.V. Chandra Shekar, A.K. Sinha, Anuj Upadhyay, M.N. Singh,