ePubs

The open archive for STFC research publications

Full Record Details

Persistent URL	http://purl.org/net/epubs/work/49950
Record Status	Checked
Record Id	49950
Title	Structural phase transitions in BaPrO₃
Contributors	PJ Saines (University of Sydney), BJ Kennedy (University of Sydney), RI Smith (Science and Technology Facilities Council)
Abstract	The crystal structures adopted by BaPrO3 at and above ambient temperature have been examined using a combination of synchrotron X-ray and neutron diffraction. BaPrO3 has been established to undergo a series of phase transitions from Pbnm orthorhombic -> Ibmm orthorhombic -> R-3c rhombohedral -> Pm-3m cubic. BaPrO3 is the second A2+B4+O3 perovskite found to adopt rhombohedral symmetry in preference to the I4/mcm tetragonal structure. Analysis of the octahedral tilting through the rhombohedral to cubic phase transition indicates that this transformation is continuous and tricritical in nature. The tricritical behaviour of this transition is likely to be a result of the competition between tetragonal and rhombohedral structures to be the preferred phase, with the rhombohedral symmetry adopted by BaPrO3 being stabilised by the unusually large B-site cation.
Organisation	ISIS , ISIS-POLARIS , STFC
Keywords	Materials , Chemistry , crystal structure , neutron scattering , oxides , X-ray diffraction
Funding Information
Related Research Object(s):
Licence Information:
Language	English (EN)

Type	Details	URI(s)	Local file(s)	Year
Journal Article	Mater Res Bull 44, no. 4 (2009): 874-879.	doi:10.1016/j.materresbull.2008.09.013		2009