view article
Figure 10
Thermal evolution of Nb—O bond lengths over the region 300 < T < 500°C, showing a decrease in the off-centring of the Nb atom within the NbO6 octahedron as the P42mc – P42/nmc phase transition is approached.

IUCrJ
Volume 4| Part 3| May 2017| Pages 215-222
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002226