Photoacoustic and reflectance spectra of zirconium-silicate pigments

Photoacoustic spectra and diffusion reflectance spectra of powdered zirconium-silicate ceramic pigments (Zr_0·97V_0.03Si₄, Zr_0·98Pr_0·02SiO₄ and ZrSiO₄ 0·05 -Fe₂O₃) have been measured and found to be closely correlated. The signal saturation problem connected with both spectral techniques is extensively discussed with respect to a particle size of powdered samples. The photoacoustic technique enables one to establish the bulk optical absorption coefficients of the powdered samples and thermal parameters, knowing the particle size diameters.