Accession Number : AD0701746

Title :   VISCOSITY AND ELECTRICAL CONDUCTIVITY OF GLASSES AT CONSTANT VOLUME. VOLUME.

Descriptive Note : Final rept. 1 Oct 68-31 Aug 69,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y

Personal Author(s) : Mackenzie,John D.

Report Date : 31 AUG 1969

Pagination or Media Count : 13

Abstract : A technique of measuring ionic conductivity as a function of temperature as well as pressure was developed. Results were obtained for simple borate systems from the solid glassy state to the molten state up to 5000 psi. The most important observations were that both the activation energy and the activation volume for conduction appeared to attain maximum values at temperatures near the glass-transition point. A new method of measuring viscosities of glasses such as boric oxide and related glasses was developed by firing a projectile into the molten glass and measuring the penetration depth. At relatively low viscosities self healing fractures occurred. (Author)

Descriptors :   (*GLASS, ELECTRICAL CONDUCTIVITY), VISCOSITY, BORON COMPOUNDS, OXIDES, FRACTURE(MECHANICS), PHASE STUDIES

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE