High-temperature phase transitions in SrHfO{sub 3}

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.2972· OSTI ID:357296

Kennedy, B J; Howard, C J ^[1]; Chakoumakos, B C ^[2]

---

1. School of Chemistry, The University of Sydney, Sydney, New South Wales 2006 (Australia)
2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

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 ({ital Pnma}). By 870 K the material adopts a second orthorhombic structure ({ital Cmcm}). The material then undergoes a further phase transition and is tetragonal (I4/mcm) from {approximately}1000 to 1353 K. At higher temperatures ({gt}1360 K) the structure is the ideal cubic perovskite (Pm{bar 3}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. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 357296
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 60; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
HAFNIUM OXIDES
NEUTRON DIFFRACTION
ORDER PARAMETERS
PEROVSKITES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES