THE ANTIFERROELECTRIC CRYSTAL-STRUCTURE OF THE HIGHLY ORDERED COMPLEX PEROVSKITE PB(YB1/2NB1/2)O3

The crystal structure of antiferroelectric Pb(Yb1/2Nb1/2)O3 has been characterized. Both x-ray diffraction and transmission electron diffraction show two sets of superlattice reflections originating respectively from the B-site atom ordering and the antiparallel lead-atom displacements which suffer within the orthorhombic a(o)-b(o) plane along the a(o) direction. The room-temperature crystal symmetry is considered to be orthorhombic with space group Pbnm (D2h16) and lattice parameters a(o) = 5.918 angstrom, b(o) = 23.453 angstrom and c(o) = 8.221 angstrom. High-resolution electron microscopy confirms the diffraction results. A structural phase transition from the lower-symmetry phase to the cubic paraelectric phase occurs at about 302-degrees-C on heating.
Publisher
IOP PUBLISHING LTD
Issue Date
1991-04
Language
ENG
Citation

JOURNAL OF PHYSICS-CONDENSED MATTER, v.3, no.13, pp.2147 - 2155

ISSN
0953-8984
DOI
10.1088/0953-8984/3/13/017
URI
http://hdl.handle.net/10203/59443
Appears in Collection
MS-Journal Papers(저널논문)
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