DEPENDENCE OF THE PHOTOACOUSTIC SIGNAL INTENSITY SPECTRA ON SINTERINGTEMPERATURE FOR CERAMIC CDS AND CDS0.5SE0.5

Photoacoustic spectroscopy is used to study the heat generated by nonr adiative processes in ceramic CdS and CdS0.5Se0.5. It can provide info rmation about optical absorption because the detection of signal is di rectly proportional to thermal energy induced by the absorbed photons. Photoacoustic spectra of ceramic CdS and CdS0.5Se0.5 depend on the si ntering temperature. Photoacoustic signal intensities plotted semiloga rithmically vary linearly with photon energy below the fundamental abs orption edges. The steepness factor for CdS, which characterizes the s lope of the semilogarithmically plot, decreases with increasing sinter ing temperature, indicating structural disorder. On the other hand, th at of CdS0.5Se0.5 increases with increasing sintering temperature, ind icating a decrease in structural disorder.