ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A numerical model was developed which enables the calculation of the optical constants(refractive index, n and extinction coefficient, k) of thermochromic coatings based in undoped anddoped vanadium dioxide thin coatings deposited on glass for use as an intelligent window - awindow that can change the optical properties in response to the temperature. From experimentalresults it can be seen that the vanadium dioxide coating prepared by Atmospheric Chemical VapourDeposition shows a switching efficiency of about 30% at 2500 nm. In the visible range thetransmittance and the reflectance does not change with the temperature both for the undoped and Nbdoped VO2. For the Nb doped vanadium dioxide coating the switching efficiency is about 20% at2500 nm. From the numerical simulations a n=2.89 and k=1.33 above Tc and n=2.39 and k=0.52below Tc (at wavelength of 2500 nm) were determined for the undoped vanadium dioxide coating.The Nb doped vanadium dioxide coating calculations results on n= 2.45 and k=1.56 above Tc andn=1.92 and k=0.88 below Tc
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.640.pdf
