Abstract
Homogeneous CaO–P 2O 5 and Cu 2O–CaO–P 2O 5 glasses were prepared using a melt-quenched method under controlled conditions. The binary glasses were found to be colourless and transparent while the ternary glasses changed from light green to dark green as the Cu 2O content increased. From the absorption edge studies, the values of the optical band gap, E opt and Urbach energy, Δ E were evaluated. The position of the absorption edge and hence the optical band gap were found to depend on the glass composition. Analysis of the optical band gap shows that for the binary glasses, the value increases as the content of CaO decreases, while for the ternary glasses, the value of the optical band gap increases as the content of the Cu 2O decreases. The density of the glasses was also measured and was found to increase with the increase in CaO and Cu 2O contents.
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