Pressure-induced phase transformations in cubic Gd2O3
Abstract
High-pressure transformation and compression behavior of Gd2O3 were investigated using synchrotron radiation x-ray diffraction in a diamond anvil cell up to 44 GPa at room temperature. The structural transformation from a cubic to a monoclinic phase occurred during the sample precompression process. Phase transitions from both the cubic and the monoclinic polymorphs to a hexagonal structure were observed. The hexagonal phase was stable up to the highest pressure in this study and was not quenchable and transformed to a monoclinic phase after pressure release. The bulk moduli of Gd2O3 for the cubic, monoclinic, and hexagonal phases were obtained by fitting the compression data to the Birch-Murnaghan equation of state. Moreover, an anomaly of the hexagonal type Gd2O3 was observed.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- October 2009
- DOI:
- 10.1063/1.3236580
- Bibcode:
- 2009JAP...106g3507B
- Keywords:
-
- equations of state;
- gadolinium compounds;
- high-pressure solid-state phase transformations;
- synchrotron radiation;
- X-ray diffraction;
- 64.70.K-;
- 62.50.-p;
- 81.30.Hd;
- 64.30.Jk;
- Solid-solid transitions;
- High-pressure effects in solids and liquids;
- Constant-composition solid-solid phase transformations: polymorphic massive and order-disorder;
- Equations of state of nonmetals