A Universal Phase Diagram for PMN-xPT and PZN-xPT

Details A Universal Phase Diagram for PMN-xPT and PZN-xPT A Universal Phase Diagram for PMN-xPT and PZN-xPT

2003-04-11

arxiv.org/abs/cond-mat/0304289v1

J. Phys.: Condens. Matter 16 (2004) 7113-7121.

Physics

Condensed Matter

Materials Science

Replaced Fig. 3 with better version

Scientific paper

10.1088/0953-8984/16/39/042

The phase diagram of the Pb(Mg1/3Nb2/3)O3 and PbTiO3 solid solution (PMN-xPT) indicates a rhombohedral ground state for x < 0.32. X-ray powder measurements by Dkhil et al. show a rhombohedrally split (222) Bragg peak for PMN-10%PT at 80 K. Remarkably, neutron data taken on a single crystal of the same compound with comparable q-resolution reveal a single resolution-limited (111) peak down to 50 K, and thus no rhombohedral distortion. Our results suggest that the structure of the outer layer of these relaxors differs from that of the bulk, which is nearly cubic, as observed in PZN by Xu et al.

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