Fig. 2.

Crystal structure of La-438. (A) The I4/mmm unit cell is highlighted with solid lines, and the F4/mmm setting used in this work is identified by the lattice vectors a, b, and c. Temperature dependence of the (B–D) unit cell parameters and (E–G) bond distances extracted from Rietveld refinement on high-resolution synchrotron X-ray powder diffraction data. Error bars represent the estimated SD from the refinement, and they are smaller than symbols for the unit cell parameters (a, c, and V).