Results of Rietveld analysis of the synchrotron x-ray diffraction data on Pb(ZrxTi1-x)O-3 (PZT) for 0.525 <= x <= 0.60 are presented to show the absence of rhombohedral phase on the Zr-rich side of the morphotropic phase boundary. Our results reveal that the structure of PZT is monoclinic in the Cm space group for 0.525 <= x <= 0.60. The nature of the monoclinic distortion changes from pseudotetragonal for 0.525 <= x <= 0.54 to pseudo-rhombohedral for x > 0.54.
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