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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.

In situ neutron diffraction study of electric field induced structural transitions in lanthanum doped lead zirconate titanate