UM
Anomalous x-ray scattering study of chemical & polar nanodomains in Pb(Mg 1/3 Nb 2/3 )O 3 single crystal
Tkachuk A.; Chen H.
2001
Source PublicationFerroelectrics
Volume253
Issue1-4
AbstractA systematic study of the temperature dependence of the superlattice reflections has been carried out using anomalous x-ray scattering technique in a single crystal Pb(Mg Nb )O (PMN). Two types of nanodomains were found to exist in PMN: a) chemically ordered nanodomains, and b) polar regions formed by short-range correlated ionic displacements. Each type of nanodomains gives rise to superlattice reflections at different locations in the reciprocal space. From the temperature dependence of the superlattice peaks, corresponding to polar nanodomains, we found a second order structural phase transition near T =220 K. This transition corresponds to the freezing of correlated oxygen octahedra rotations with temperature-independent correlation radius of 40 Å below T . Chemical nanodomains due to short-range order on the B sites were shown to exhibit isotropic shape and temperature independent size of 50 Å in 15-800 K interval. Anomalous diffraction near Pb L absorption edge has shown that Pb displacements are not random at low temperatures, but correlated on the short-range scale.
KeywordPMN Polar nanodomains Relaxor ferroelectrics Short-range order Synchrotron x-ray diffraction
URLView the original
Language英語
Fulltext Access
Document TypeConference paper
CollectionUniversity of Macau
AffiliationUniversity of Illinois at Urbana-Champaign
Recommended Citation
GB/T 7714
Tkachuk A.,Chen H.. Anomalous x-ray scattering study of chemical & polar nanodomains in Pb(Mg 1/3 Nb 2/3 )O 3 single crystal[C],2001.
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