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A summary of the work recently carried out on the morphotropic phase boundary(MPB) of PZT is presented. By means of x-ray powder diffraction on ceramicsamples of excellent quality, the MPB has been successfully characterized bychanging temperature in a series of closely spaced compositions. As a result,an unexpected monoclinic phase has been found to exist in between thewell-known tetragonal and rhombohedral PZT phases. A detailed structuralanalysis, together with the investigation of the field effect in this region ofcompositions, have led to an important advance in understanding the mechanismsresponsible for the physical properties of PZT as well as other piezoelectricmaterials with similar morphotropic phase boundaries.Comment: 5 pages REVTeX file, 6 figures embedded. Presented at the Workshop on  "Fundamental Physics of Ferroelectrics" held in Aspen, February 00. To appear  in the proceeding

The monoclinic phase in PZT: New light on morphotropic phase boundaries