491051.fig.002a
(a)
491051.fig.002b
(b)
491051.fig.002c
(c)
Figure 2: XRD patterns of V 1 𝑥 W 𝑥 O2 nanopowders annealing at 500°C for 8 h with molar ratio of 2 : 3 (a) adding different extents of tungsten doping. A magnified version of the XRD data depicted in (b) in the 26.5° ≤ 2θ ≤ 29° range and in (c) in the 64° ≤ 2θ ≤ 66° range.