EFFECTS OF OXIDES IN CADMIUM MIXED HALIDE GLASS

A cadmium fluorochloride glass was doped with variable amounts of CdO, NaPO3 and NaBO2. In a general way, oxygen anions increase glass formi ng ability and enhance chemical durability. Maximum molar concentratio ns of CdO, NaBO2 and NaPO3 should not exceed 2, 10 and 15%, respective ly, in order to prevent devitrification. The relation between physical properties and composition has been studied. While the evolution of t he main physical parameters, i.e., transition temperature, density, re fractive index and chemical durability, is not monotonous Versus CdO c ontent, linear variations are observed with NaBO2 and NaPO3. Some oxid e-containing glasses with lower refractive index, higher chemical dura bility and suitable thermal properties are reported. Potential use for optical fiber preform manufacturing is discussed.