Figure 3
(a) Rietveld refinement of the ninth vertical strip of the imaging plate, corresponding to about 8 min of catalyst treatment at 773 K (λ = 0.72384 Å). Upper tick marks: tetragonal phase. Lower tick marks: cubic phase. The amorphous halo at 10° 2θ is due to the capillary scattering. (b) Enlargement of the 20–25° 2θ interval, demonstrating the presence of two phases. |