In-operando synchrotron experiments of flash sintering carried out in current rate mode

O'Toole, Rebecca J.; Yoon, Bola; Ghose, Sanjit; Weimer, Alan W.; Musgrave, Charles B.; Raj, Rishi

doi:10.1111/jace.19049

In-operando synchrotron experiments of flash sintering carried out in current rate mode

Journal Article · Wed Feb 08 00:00:00 EST 2023 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.19049· OSTI ID:2319172

^[1]; ^[1]; Ghose, Sanjit ^[2]; ^[1]; Musgrave, Charles B. ^[1]; ^[1]

Univ. of Colorado, Boulder, CO (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

Here, we report first-time results for in-operando flash sintering synchrotron experiments carried out in current rate mode where the specimen, held at a constant temperature, is fed current that is increased at a constant rate. These experiments are unique because the time dependence of the sintering behavior can be stretched out over a longer period (by changing the current rate) than in voltage-to-current experiments in which sintering occurs in a burst at the onset of the flash. Two results are presented: (i) A comparison of temperatures measured with the platinum standard to those predicted by the black body radiation model leading to estimates of the emissivity as a function of porosity whereby emissivity increases from 0.65 to 0.9 as the sample sinters from its green state to full density, and (ii) measurements of the excess lattice expansion as a function of density as the sample sinters continuously while the current is increased. The present work highlights the promise of current rate experiments to obtain results while the sample sinters gradually from its green density to full density (somewhat akin to conventional sintering) for gaining further insights into the mechanisms of flash sintering.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2319172

Alternate ID(s):: OSTI ID: 1960345

Report Number(s):: BNL--225360-2024-JAAM

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 106; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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