In situ neutron diffraction study of electric field induced structural transitions in lanthanum doped lead zirconate titanate
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Autor:
Hinterstein, M; Hoelzel, M; Kungl, H; Hoffmann, MJ; Ehrenberg, H; Fuess, H
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Quelle:
ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2011, Band 226, Heft 2, S. 155-162
Abstract
The structural reaction of La-doped PbZr(1-x)Ti(x)O(3) (PLZT) with x =
0.44, 0.46 and 0.475 to an electric field was investigated by in situ
neutron diffraction. The induced structural changes and the anisotropic
displacement parameters were analysed. While the composition with a high
Ti content shows a trend to tetragonal characteristics, PLZT with a low
Ti content exhibits a rhombohedral response to the applied electric
field. The intermediate composition with x = 0.46 appears rhombohedral
in the unpoled state. Under the influence of an applied electric field,
however, the response is similar to tetragonal PLZT (x = 0.475). With
the investigated compositions the field induced processes are
characterised. In the tetragonal composition the field dependent
variation of the tetragonal lattice distortion is most pronounced. In
rhombohedral PLZT (x = 0.44) the pseudorhombohedral lattice distortion
exhibits the most significant changes. In the intermediate composition
primarily atomic displacements are involved. Hence, a systematic change
of the response to an applied electric field is observed while crossing
the morphotropic phase boundary.