Accession Number:

ADA051156

Title:

An Approach to Understanding the Mixed Alkali Effect.

Descriptive Note:

Technical rept.,

Corporate Author:

BROWN UNIV PROVIDENCE R I DEPT OF CHEMISTRY

Report Date:

1977-12-26

Pagination or Media Count:

33.0

Abstract:

An approach to understanding the mixed alkali effect in binary ionic oxide glasses is proposed. It is based on an expression for the composition dependence of activated processes which is inherently cooperative, and employs the regular solution model for the specification of this dependence. A detailed molecular-level model, using spectroscopic data, is introduced to obtain an estimate of the magnitude of the parameters of the approach. It is shown that the composition dependences of the non-linearly varying properties of mixed alkali systems, including both the measured properties and the exponential and pre-exponential factors obtained from their temperature dependence, can be understood using this approach. Author

Subject Categories:

  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE