Mechanical stress relaxation in inorganic glasses studied by a step-strain technique

No Thumbnail Available

Date

1991-06-11

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier Science

Alternative Title(s)

Abstract

A computer-controlled transient viscoelastometer, which is an adaption of the Rheovibron, has been developed to study the mechanical stress relaxation of amorphous materials over a range of more than five decades in time. The instrument was used to investigate the degree of non-exponentiality of the tensile stress autocorrelation function of AgI---Ag2SO4---Ag2WO4 and Ge---As---Se glasses. Upon variation of the composition, both ternary systems show large variations of the smearing of the calorimetric glass-transition anomaly. For most cases low-noise decay functions could be observed which are well fitted by stretched exponentials. For 50AgI·25Ag2SO4·25Ag2WO4 an exceptionally broad distribution of relaxation times is found. This is consistent with the sub-Tg specific heat peak previously observed in these mixed oxyanion glasses. For pure amorphous selenium two distinct relaxation processes are observed.

Description

Table of contents

Keywords

Subjects based on RSWK

Citation

Böhmer, R.; Senapati, H.; Angell, C. A.: Mechanical stress relaxation in inorganic glasses studied by a step-strain technique. In: Journal of Non-Crystalline Solids Jg. 131-133(1991), S. 182-186, doi: 10.1016/0022-3093(91)90295-H.