Abstract
Single crystals of cadmium tartrate pentahydrate (CTP) have been grown by the famous gel technique. The slow and controlled reaction between Cd2+ and (C4H4O6)2− ions in silica hydrogel results in formation of the insoluble product, CdC4H4O6.5H2O. Optical absorption spectra have been recorded in the range 200 to 2500 nm. Fundamental absorption edge for electronic transition has been analyzed. The direct allowed transition is found to be present in the region of relatively higher photon energy. Analysis of the segments of α½ versus hν graph has been made to separate individual contribution of phonons. The phonons involved in the indirect transition are found to correspond to 335 and 420 cm−1. Scattering of charge carriers in the lattice is found due to acoustic phonons.
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