Phase transition of intermetallic TbPt at high temperature and high pressure

Fei Qin, Xiang Wu, Ke Yang, Shan Qin

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Here we present synchrotron-based x-ray diffraction experiments combined with diamond anvil cell and laser heating techniques on the intermetallic rare earth compound TbPt (Pnma and Z  =  4) up to 32.5 GPa and ~1800 K. The lattice parameters of TbPt exhibit continuous compression behavior up to 18.2 GPa without any evidence of phase transformation. Pressure–volume data were fitted to a third-order Birch–Murnaghan equation of state with V 0  =  175.5(2) Å3,   =  110(5) GPa and   =  3.8(7). TbPt exhibits anisotropic compression with β a   >  β b   >  β c and the ratio of axial compressibility is 2.50:1.26:1.00. A new monoclinic phase of TbPt assigned to the Pc or P2/c space group was observed at 32.5 GPa after laser heating at ~1800 K. This new phase is stable at high pressure and presented a quenchable property on decompression to ambient conditions. The pressure–volume relationship is well described by the second-order Birch–Murnaghan equation of state, which yields V 0  =  672(4) Å3,   =  123(6) GPa, which is about ~14% more compressible than the orthorhombic TbPt. Our results provide more information on the structure and elastic property view, and thus a better understanding of the physical properties related to magnetic structure in some intermetallic rare earth alloys.
Original languageEnglish
Article number144001
Number of pages6
JournalJournal of Physics Condensed Matter
Volume30
Issue number14
Early online date12 Mar 2018
DOIs
Publication statusPublished - 11 Apr 2018

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