Neutron scattering study of the relaxor ferroelectric (1-x)Pb(Zn1/3Nb2/3)O-3-xPbTiO(3)

Article

关键词: SINGLE-CRYSTALS;    PHASE-DIAGRAM;    PHONON ANOMALIES;    PB(MG1/3NB2/3)O-3;    PBMG1/3NB2/3O3;    BEHAVIOR;    PB(ZN1/3NB2/3)O-3;    TEMPERATURE;    DYNAMICS;    GROWTH;   

DOI  :  10.1103/PhysRevB.67.134110

来源: SCIE

【 摘 要 】

Neutron elastic diffuse scattering experiments performed on Pb(Zn1/3Nb2/3)O-3 (PZN) and on its solid solution with PbTiO3(PT), known as PZN-xPT, with x=4.5 and 9 % around many reflections show that diffuse scattering is observed around reflections with mixed indices in the transverse and diagonal directions only. From the width of the diffuse scattering peak a correlation length is extracted. In PZN, we have reported that the diffuse scattering is more extended in the transverse than in the diagonal directions [D. La-Orauttapong, J. Toulouse, J. L. Robertson, and Z.-G. Ye, Phys. Rev. B 64, 212101 (2001)]. In the present work, the results show that the addition of PT leads to a broadening of the diffuse scattering along the diagonal, relative to the transverse directions, indicating a change in the orientation of the polar regions. Also, with the addition of PT, the polar nanoregions condense at a higher temperature above the transition than in pure PZN (>40 K), due to stronger correlations between the polar regions. Neutron inelastic scattering measurements have also been performed on PZN-xPT. The results show the broadening of the transverse acoustic phonon mode at a small momentum transfer q upon cooling. We attribute this broadening to the appearance of the polar nanoregions.

【 授权许可】

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