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Figure 2
Schematic representation of the atomic displacements (polarization vectors) of symmetry-adapted modes for describing the symmetry-lowering transitions (a) [Pm{\overline 3}m \to P{2_1}/n], (b) [Pm{\overline 3}m \to Pbnm] and (c) [Pm{\overline 3}m \to R{\overline 3}c]. Pr, Ni and O atoms are drawn as yellow, gray and blue spheres, respectively, while the red arrows denote the amplitudes of the symmetry-adapted modes. To represent the two distinct nickel sites in the monoclinic phase, the octahedral units are colored with two different gray shades (Ni13+δ, light; Ni23−δ′, dark).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 6| December 2025| Pages 2112-2118
https://doi.org/10.1107/S1600576725009380
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