TY - JOUR
T1 - High-temperature phase transitions in SrHfO3
AU - Kennedy, Brendan J.
AU - Howard, Christopher J.
AU - Chakoumakos, Bryan C.
PY - 1999
Y1 - 1999
N2 - The crystal structure of SrHfO3 has been studied at high temperatures using powder neutron diffraction and the Rietveld method. From 300 K to approximately 670 K the structure of SrHfO3 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 (I4/mcm) from 1000 to 1353 K. At higher temperatures (> 1360 K) the structure is the ideal cubic perovskite (Pm3−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.
AB - The crystal structure of SrHfO3 has been studied at high temperatures using powder neutron diffraction and the Rietveld method. From 300 K to approximately 670 K the structure of SrHfO3 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 (I4/mcm) from 1000 to 1353 K. At higher temperatures (> 1360 K) the structure is the ideal cubic perovskite (Pm3−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.
UR - http://www.scopus.com/inward/record.url?scp=0001760147&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.60.2972
DO - 10.1103/PhysRevB.60.2972
M3 - Article
AN - SCOPUS:0001760147
SN - 1098-0121
VL - 60
SP - 2972
EP - 2975
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
ER -