Figure 1: (a) Rietveld fit (red graph) to XRD data points (black circles) for orthorhombic PbNb2O6 with their difference shown by the continuous curve in the smaller-sized graph. The vertical blue bars below the main graph are the calculated peak positions. (b) Electron diffraction pattern for HR Transmission Electron Microscopy on a selected grain (microcrystal) of quenched lead metaniobate (PNO).