Figure 12

JCPDS card No. 72-0514 (a), transmittance spectra at 25°C and 100°C (b), hysteresis loop at 2000 nm (c) as well as corresponding d(Tr)/d(T) &T plot of W-doped VO₂-SiO₂ composite film (molar ratio: W/V = 0.015; Si/V = 0.8).

Tr and T represent transmittance and temperature at 2000 nm, respectively.