Physics – Condensed Matter – Materials Science
Scientific paper
2001-06-04
Phys. Rev. B, 64 (2001) 212101
Physics
Condensed Matter
Materials Science
REVTeX file. 4 pages, 3 figures embedded, New version after referee cond-mat/0106051
Scientific paper
10.1103/PhysRevB.64.212101
Diffuse scattering around the (110) reciprocal lattice point has been investigated by elastic neutron scattering in the paraelectric and the relaxor phases of the disordered complex perovskite crystal-Pb(Zn1/3Nb2/3)O3(PZN). The appearance of a diffuse intensity peak indicates the formation of polar nanoregions at temperature T*, approximately 40K above Tc=413K. The analysis of this diffuse scattering indicates that these regions are in the shape of ellipsoids, more extended in the <111> direction than in the <001> direction. The quantitative analysis provides an estimate of the correlation length, \xi, or size of the regions and shows that \xi <111>~1.2\xi < 001>, consistent with the primary or dominant displacement of Pb leading to the low temperature rhombohedral phase. Both the appearance of the polar regions at T*and the structural transition at Tc are marked by kinks in the \xi < 111> curve but not in the \xi < 001> one, also indicating that the primary changes take place in a <111> direction at both temperatures.
La-Orauttapong D.
Robertson J. L.
Toulouse Jean
Ye Zuo-Guang
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