Recent controversy about the space group of the low temperature superlattice phase of $\mathrm{Pb}\left({\mathrm{Zr}}_{0.52}{\mathrm{Ti}}_{0.48}\right){\mathrm{O}}_3$ is settled. It is shown that the $R3c$ space group for the superlattice phase cannot correctly account for the peak positions of the superlattice reflections present in the neutron diffraction patterns. The correct space group is reconfirmed to be $Cc$. A comparison of the atomic coordinates of $Cc$ and $Cm$ space groups is also presented to show that in the absence of superlattice reflections, as is the case with x-ray diffraction data, one would land up in the $Cm$ space group. This superlattice phase is found to coexist with another monoclinic phase of the $Cm$ space group.

• Received 6 July 2004

DOI:https://doi.org/10.1103/PhysRevB.71.092101