Direct observation of the near-surface layer in Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ using neutron diffraction

Details Direct observation of the near-surface layer in Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ using neutron diffraction Direct observation of the near-surface layer in Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ using neutron diffraction

2004-07-23

arxiv.org/abs/cond-mat/0407609v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.172204

Spatially resolved neutron diffraction as a function of crystal depth in Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ reveals the presence of a distinct near-surface region. A dramatic change in both the lattice constant and the Bragg peak intensity as a function of crystal depth is observed to occur in this region over a length scale $\sim$ 100 $\mu$m. This confirms a previous assertion, based on a comparison between high-energy x-rays and neutrons, that such a near surface region exists in the relaxors. Consequences to both single crystal and powder diffraction measurements and previous bulk neutron diffraction measurements on large single crystals are discussed.

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