Monoclinic structure of unpoled morphotropic high piezoelectric PMN-PT and PZN-PT compounds

By J. Kiat, Y. Uesu, B. Dkhil, M. Matsuda, C. Malibert, G. Calvarin. 2001

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Evidences of a monoclinic phase in unpoled (PbMg 1 / 3 Nb 2 / 3 O 3 ) 1 - x -(PbTiO 3 ) x with x=0.35 (PMN-PT 35%) and unpoled (PbZn 1 / 3 Nb 2 / 3 O 3 ) 1 - x -(PbTiO 3 ) x with x=0.09 (PZN-PT 9%) are presented from a neutron Rietveld analysis. This monoclinic phase is different from the phase recently evidenced by Noheda and co-workers in PbZr 1 - x Ti x O 3 with x = 0.48 [B. Noheda et al., Phys. Rev. B. 61, 8687 (2000)] but is identical to the phase observed in poled PZN-PT with x = 0.08 [B. Noheda et al., Phys. Rev. Lett. 86, 3891 (2001 )] by the same authors. The structural resolutions allowed us to compare both structures and to deduce the direction and magnitude of polarization. In PMN-PT 35% and PZN-PT 9% this phase is characterized by a weak value of polarization, a strong deformation of oxygen polyhedra, and weak cationic shifts.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a48dded2dca02e5e3580b7cbfe680a8b6bb7a083