Ferroelectric-paraelectric phase transition in the n=2 Aurivillius phase Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9}: A neutron powder diffraction study

The ferroelectric phase transition in the Aurivillius phase Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9} was studied by high-resolution neutron powder diffraction. Below the ferroelectric Curie temperature T{sub c}=735 deg. C, Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9} adopts the polar orthorhombic space grou...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-01, Vol.71 (2)
Main Authors: Hyatt, Neil C., Reaney, Ian M., Knight, Kevin S., ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX
Format: Article
Language:English
Subjects:
BISMUTH COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CURIE POINT
FERROELECTRIC MATERIALS
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
OXIDES
PHASE TRANSFORMATIONS
SPACE GROUPS
TETRAGONAL LATTICES
TITANIUM COMPOUNDS
TUNGSTEN COMPOUNDS
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Summary:The ferroelectric phase transition in the Aurivillius phase Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9} was studied by high-resolution neutron powder diffraction. Below the ferroelectric Curie temperature T{sub c}=735 deg. C, Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9} adopts the polar orthorhombic space group A2{sub 1}am. A direct transition to the nonpolar tetragonal space group I4/mmm is observed on passing through T{sub c}, with no evidence of an intermediate nonpolar orthorhombic Amam phase. Above 700 deg. C, Bi{sub 3}Ti{sub 1.5}W{sub 0.5}O{sub 9} is metrically 'tetragonal' (i.e., a=b, within experimental precision), however, the presence of weak supercell reflections indicates that the material remains crystallographically orthorhombic below T{sub c}.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.71.024119