Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4934945
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Funding
- National Science Foundation through the International Materials Institute for New Functionality in Glass at Lehigh University [DMR 0844014]
- Basic Energy Sciences Division of the Department of Energy [DE-FG02-07ER46403]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0844014] Funding Source: National Science Foundation
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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. (C) 2015 AIP Publishing LLC.
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