Emergence and Extinction of a New Phase During On–Off Experiments Related to Flash Sintering of 3 YSZ

Lebrun, Jean‐Marie; Morrissey, Timothy G.; Francis, John S. C.; Seymour, Kevin C.; Kriven, Waltraud M.; Raj, Rishi; Zhou, ed., Y.

doi:10.1111/jace.13476

Emergence and Extinction of a New Phase During On–Off Experiments Related to Flash Sintering of 3 YSZ

Journal Article · Wed Jan 21 23:00:00 EST 2015 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.13476· OSTI ID:1400504

Lebrun, Jean‐Marie ^[1]; Morrissey, Timothy G. ^[1]; Francis, John S. C. ^[1]; Seymour, Kevin C. ^[2]; Kriven, Waltraud M. ^[2]; Raj, Rishi ^[1]; Zhou, ed., Y.

Department of Mechanical Engineering University of Colorado at Boulder Colorado 80309‐0427
Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Illinois 61801

The flash phenomenon occurs when oxide ceramics are heated above a threshold temperature under an applied electric field. It is defined as an abrupt increase in the conductivity of the specimen. The specimen then can be held in this state of high conductivity by switching the power supply from voltage to current control. Here, we report on the emergence of new X‐ray diffraction peaks in 3 mol% yttria‐stabilized zirconia (3 YSZ ) when the specimen is held in this current controlled state. These peaks are indexed as a pseudocubic phase of zirconia. The peaks extinguish and reappear when the field is turned off and on. The specimen temperature in the flash state is measured from the thermal expansion of platinum, which is placed as a thin film on a small portion of the specimen surface. Experiments without the electric field, at even higher temperatures than those measured with the platinum standard, do not show any change of phase, thus ruling out Joule heating as the cause of this phenomenon. The time dependency of the growth and dissolution of the pseudo cubic phase is reported. These in situ experiments were carried out at the Advanced Photon Source Synchrotron at the Argonne National Laboratory.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1400504

Alternate ID(s):: OSTI ID: 1184241

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 98; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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