Fig. 2From: Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic PropertiesAbsorption spectra (a) and the plot of square root of absorption coefficient vs incident photon energy (b) 1, FexTiyOz450; 2, N/FexTiyOz450; 3, FexTiyOz500; 4, N/FexTiyOz500Back to article page