DOI: 10.1063/1.123756 ISSN:
A monoclinic ferroelectric phase in the Pb(Zr1−xTix)O3 solid solution
B. Noheda, D. E. Cox, G. Shirane, J. A. Gonzalo, L. E. Cross, S-E. Park- Physics and Astronomy (miscellaneous)
A previously unreported ferroelectric phase has been discovered in a highly homogeneous sample of PbZr0.52Ti0.48O3 by high-resolution synchrotron x-ray powder diffraction measurements. At ambient temperature the sample has tetragonal symmetry (at=4.037 Å, ct=4.138 Å), and transforms below ∼250 K into a phase which, unexpectedly, has monoclinic symmetry (am=5.717 Å, bm=5.703 Å, cm=4.143 Å, β=90.53°, at 20 K). The intensity data strongly indicate that the polar axis lies in the monoclinic ac plane close to the pseudocubic [111] direction, which would be an example of the species m3m(12)A2Fm predicted on symmetry grounds by Shuvalov.