The glass forming regions of the Bi015-CuO-Ca05Sr05O superconducting system have been explored by the addition of PbO. The glass froming regions expand with PbO addition and shrink with the substitution of copper oxide by zinc oxide. The glass transition temperature of these glasses ranges from 300C to 420C. These glasses have high refractive index of about 2. 8 and density from 6 to 9 g/cm3 they are infrared transmitting with cutoff wavelength farther than 7 tm. The high polarizability of Bi3 ions gives these glasses high non-linear optical coefficient of 4 * lO13. 1.
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