Anomalous x-ray scattering study of chemical & polar nanodomains in Pb(Mg 1/3 Nb 2/3 )O 3 single crystal

A. Tkachuk*, H. D. Chen

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

A 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 1/3 Nb 2/3 )O 3 (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 f =220 K. This transition corresponds to the freezing of correlated oxygen octahedra rotations with temperature-independent correlation radius of 40 Å below T f . 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 III absorption edge has shown that Pb displacements are not random at low temperatures, but correlated on the short-range scale.

Original languageEnglish
Pages (from-to)1-9
JournalFerroelectrics
Volume253
Issue number1-4
DOIs
StatePublished - 1 Jan 2001
Event6th International Symposium on Ferroic Domains and Mesoscopic Structures (ISFD-6) - Nanjing, China
Duration: 29 May 20002 Jun 2000

Keywords

  • PMN
  • Polar nanodomains
  • Relaxor ferroelectrics
  • Short-range order
  • Synchrotron x-ray diffraction

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