High-pressure structure of praseodymium revisited: In search of a uniform structural phase sequence for the lanthanide elements
| Autor: | S. E. Finnegan, M. G. Stevenson, E. J. Pace, C. V. Storm, J. D. McHardy, M. I. McMahon, S. G. MacLeod, E. Plekhanov, N. Bonini, C. Weber |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Finnegan, S E, Stevenson, M G, Pace, E J, Storm, C V, McHardy, J D, McMahon, M I, MacLeod, S G, Plekhanov, E, Bonini, N & Weber, C 2022, ' High-pressure structure of praseodymium revisited: In search of a uniform structural phase sequence for the lanthanide elements ', Physical Review B, vol. 105, no. 17, 174104, pp. 1-8 . https://doi.org/10.1103/PhysRevB.105.174104 Physical review / B 105(17), 174104 (2022). doi:10.1103/PhysRevB.105.174104 |
| DOI: | 10.3204/pubdb-2023-00377 |
| Popis: | Physical review / B 105(17), 174104 (2022). doi:10.1103/PhysRevB.105.174104 Angle-dispersive x-ray powder diffraction experiments have been performed on praseodymium metal to a pressure of 205 GPa. Between 20 and 165 GPa only the oC4 ($α$-uranium) phase is observed, in agreement with previous studies. At 171(5) GPa we find a transition to a tetragonal tI2 phase which is isostructural with the high-pressure post-oC4 phase seen in the neighboring lanthanide cerium above 12 GPa, and with the high-pressure phase of the actinide thorium seen above 100 GPa. Electronic structure calculations determine the oC4 → tI2 transition to occur at 130 GPa at 0 K, but find another phase, with the hP1 (simple hexagonal) structure, to have a lower enthalpy than both the oC4 and tI2 structures above 20 GPa at 0 K. Published by Inst., Woodbury, NY |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|