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

R. Böhmer, H. Senapati, Charles Angell

Research output: Contribution to journalArticle

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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

Fingerprint

stress relaxation
Stress relaxation
Glass
glass
Selenium
Relaxation processes
Ternary systems
Autocorrelation
Tensile stress
Relaxation time
Specific heat
Glass transition
amorphous materials
ternary systems
selenium
tensile stress
low noise
autocorrelation
relaxation time
Chemical analysis

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Mechanical stress relaxation in inorganic glasses studied by a step-strain technique. / Böhmer, R.; Senapati, H.; Angell, Charles.

In: Journal of Non-Crystalline Solids, Vol. 131-133, No. PART 1, 11.06.1991, p. 182-186.

Research output: Contribution to journalArticle

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