Infrared transmitting bismuth germanate glasses containing zinc oxide

Sen, A. ; Chakravorty, D. ; Kumar, J. (1986) Infrared transmitting bismuth germanate glasses containing zinc oxide Journal of Non-Crystalline Solids, 88 (2-3). pp. 253-261. ISSN 0022-3093

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Some new infrared transmitting bismuth-germanate glasses containing zinc oxide have been investigated. These glasses contain up to 20 mol% ZnO, the GeO2 content varies from 60 to 80 mol%, the remainder being made up of Bi2O3. The partial substitution of ZnO for GeO2 is found to slightly increase the 50% cut-off wavelengths. The molar volumes of the glasses decrease with the increase in ZnO content. The hardness of glasses, in general, tends to increase with the addition of ZnO. All the glasses studied are resistant to water and the resistance towards 3N HCl is found to vary depending on the ZnO and Bi2O3 content of the glasses. The results are explained on the basis of glass structure taking into consideration the effects of nonbridging oxygen ions (dependent on Bi2O3 and ZnO concentration), the change in polarizability of the oxygen ions as well as switching of some of the GeO4 tetrahedra to GcO6 octahedra after ZnO addition, and formation of ZnO4 tetrahedra, especially in glasses of high ZnO content.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:7402
Deposited On:25 Oct 2010 11:40
Last Modified:28 May 2011 05:00

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