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Title: Electric field-induced softening of alkali silicate glasses

Motivated by the advantages of two-electrode flash sintering over normal sintering, we have investigated the effect of an external electric field on the viscosity of glass. The results show remarkable electric field-induced softening (EFIS), as application of DC field significantly lowers the softening temperature of glass. To establish the origin of EFIS, the effect is compared for single vs. mixed-alkali silicate glasses with fixed mole percentage of the alkali ions such that the mobility of alkali ions is greatly reduced while the basic network structure does not change much. The sodium silicate and lithium-sodium mixed alkali silicate glasses were tested mechanically in situ under compression in external electric field ranging from 0 to 250 V/cm in specially designed equipment. A comparison of data for different compositions indicates a complex mechanical response, which is observed as field-induced viscous flow due to a combination of Joule heating, electrolysis and dielectric breakdown.
Authors:
; ;  [1] ; ;  [2]
  1. Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
  2. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado 80309 (United States)
Publication Date:
OSTI Identifier:
22486024
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BREAKDOWN; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; ELECTROLYSIS; GLASS; IONS; JOULE HEATING; LITHIUM; SINTERING; SODIUM SILICATES; VISCOSITY; VISCOUS FLOW