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 language | English |
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Article number | 144001 |
Number of pages | 6 |
Journal | Journal of Physics Condensed Matter |
Volume | 30 |
Issue number | 14 |
Early online date | 12 Mar 2018 |
DOIs | |
Publication status | Published - 11 Apr 2018 |