Abstract

We have performed a Diffraction Anomalous Fine Structure (DAFS) study of a single crystal of the relaxor ferroelectric PbMg1/3Nb2/3O3. DAFS measurements were performed at the Nb K edge on a half-order Bragg reflection originating from the 1:1 ordered nanodomains. DAFS data analysis provided us with the local structure around Nb atoms in the ordered nanodomains. The Nb-O distance in the ordered region was determined to be 0.052(10) Å shorter than half the lattice parameter of the bulk crystal, in good agreement with one model of the ferroelectric phase transition broadening [JETP 84, 994 (1997)].

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