Physical properties of PbO-ZnO-P2O5 glasses -: II.: Refractive index and optical properties

Phosphate glasses of composition x PbO - 10 ZnO - (90-x) P2O5, 30 less than or equal to x(mol. %) less than or equal to 55 (series A); 50 PbO -x ZnO - (50-x) P2O5, 0 less than or equal to x(mol %) less than or equal to 20 (series B); and x PbO - (60 x) ZnO - 40 P2O5, 0 less than or equal to x(mol %) 60 (series C), were investigated. Experimental values of the refractive index (n) [1.59 less than or equal to n less than or equal to 1.87] were compared with the calculated values of n and good results were obtained using the Effective Medium Theory. Optical gap (E-g) varies in the region: 4.6 less than or equal to E-g[eV], 300 K less than or equal to 4.98, the temperature coefficient beta of the optical gap was found around 6.7 x 10(-4) [eV/K].