High-Temperature Phase Transititons in SrHfO3
Journal Article
·
· Physical Review, B: Condensed Matter
- ORNL
The crystal structure of SrHfO{sub 3} has been studied at high temperatures using powder neutron diffraction and the Rietveld method. From 300 K to approximately 670 K the structure of SrHfO{sub 3} is orthorhombic (Pnma). By 870 K the material adopts a second orthorhombic structure (Cmcm). The material then undergoes a further phase transition and is tetragonal (/4/mcm) from {approx}1000 to 1353 K. At higher temperatures (>1360 K) the structure is the ideal cubic perovskite (Pm3{sup -}m). The angle of rotation of the oxygen octahedron in the tetragonal phase is taken as the order parameter and its temperature variation is consistent with a second order phase transition.
- Research Organization:
- ORNL Oak Ridge National Laboratory
- Sponsoring Organization:
- DOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 815003
- Report Number(s):
- P99-105268
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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