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

R. Böhmer, H. Senapati, Charles Angell

Research output: Contribution to journalArticle

17 Scopus citations

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 AgIAg2SO4Ag2WO4 and GeAsSe 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.

Original languageEnglish (US)
Pages (from-to)182-186
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume131-133
Issue numberPART 1
DOIs
StatePublished - Jun 11 1991

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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