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Figure 8
The secondary GM5− mode allowed in the Cm phase of PZT. It is fully defined by the irrep, having no freedom except its amplitude. It produces a distortion of the oxygen octahedra and its amplitude is very small in all reliable structural models.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 47| Part 4| August 2014| Pages 1165-1179
https://doi.org/10.1107/S1600576714010693
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