Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5448174 | Materials Chemistry and Physics | 2017 | 22 Pages |
Abstract
Monoclinic Eu2O3 was investigated in a Mao-Bell type diamond anvil cell using angle dispersive x-ray diffraction up to a pressure of 26 GPa. Pressure induced structural phase transition from monoclinic to hexagonal phase was observed at 4.3 GPa with 2% volume collapse. Birch -Murnaghan equation of state fit to the pressure volume data yielded a bulk modulus of 159(9) GPa and 165(6) GPa for the monoclinic and hexagonal phases respectively. Equation of state fitting to the structural parameters yielded an axial compressibility of βa > βc > βb for the parent monoclinic phase, showing the least compressibility along b axis. Contrary to the available reports, an anomalous lattice compressibility behavior is observed for the high pressure hexagonal phase, characterized by pronounced hardening of a axis above 15 GPa. The observed incompressible nature of the hexagonal a axis in the pressure range 15-25 GPa is found to be compensated by doubling the compressibility along the c axis.
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
K.A. Irshad, N.V. Chandra Shekar,